Class Postgres

PostgreSQL layer for DBO.

CakeObject

DataSource

DboSource

Postgres

Package: Cake\Model\Datasource\Database
Copyright: Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
License: MIT License
Location: Cake/Model/Datasource/Database/Postgres.php

Properties summary

$_baseConfig protected

array

Base driver configuration settings. Merged with user settings.
$_sequenceMap protected

array

Contains mappings of custom auto-increment sequences, if a table uses a sequence name other than what is dictated by convention.
$_sqlOps protected

array

The set of valid SQL operations usable in a WHERE statement
$columns public

array

Columns
$description public

string

Driver description
$endQuote public

string

Ending Quote
$startQuote public

string

Starting Quote

Inherited Properties

_connection, _methodCacheChange, _queriesCnt, _queriesLog, _queriesLogMax, _queriesTime, _queryCache, _queryDefaults, _result, _sqlBoolOps, _transactionNesting, affected, alias, cacheMethods, configKeyName, fieldParameters, fullDebug, index, map, methodCache, numRows, tableParameters, took, useNestedTransactions, virtualFieldSeparator _descriptions, _sources, _transactionStarted, cacheSources, config, connected

Method Summary

_alterIndexes() protected

Generate PostgreSQL index alteration statements for a table.
_quoteFunctionField() protected

Auxiliary function to quote matched (Model.fields) from a preg_replace_callback call Quotes the fields in a function call.
alterSchema() public

Alter the Schema of a table.
boolean() public

Translates between PHP boolean values and PostgreSQL boolean values
buildColumn() public

Generate a Postgres-native column schema string
buildIndex() public

Format indexes for create table
column() public

Converts database-layer column types to basic types
connect() public

Connects to the database using options in the given configuration array.
describe() public

Returns an array of the fields in given table name.
enabled() public

Check if PostgreSQL is enabled/loaded
fetchResult() public

Fetches the next row from the current result set
fields() public

Generates the fields list of an SQL query.
getEncoding() public

Gets the database encoding
getSchemaName() public

Gets the schema name
getSequence() public

Gets the associated sequence for the given table/field
index() public

Returns an array of the indexes in given datasource name.
lastInsertId() public

Returns the ID generated from the previous INSERT operation.
length() public

Gets the length of a database-native column description, or null if no length
limit() public

Returns a limit statement in the correct format for the particular database.
listSources() public

Returns an array of tables in the database. If there are no tables, an error is raised and the application exits.
name() public

Prepares field names to be quoted by parent
nestedTransactionSupported() public

Check if the server support nested transactions
renderStatement() public

Overrides DboSource::renderStatement to handle schema generation with Postgres-style indexes
resetSequence() public

Reset a sequence based on the MAX() value of $column. Useful for resetting sequences after using insertMulti().
resultSet() public

resultSet method
setEncoding() public

Sets the database encoding
truncate() public

Deletes all the records in a table and drops all associated auto-increment sequences
value() public

Returns a quoted and escaped string of $data for use in an SQL statement.

Method Detail

_alterIndexes() protected ¶

_alterIndexes( string $table , array $indexes )

Generate PostgreSQL index alteration statements for a table.

Parameters

string $table: Table to alter indexes for
array $indexes: Indexes to add and drop

Returns

array
Index alteration statements

_quoteFunctionField() protected ¶

_quoteFunctionField( string $match )

Auxiliary function to quote matched (Model.fields) from a preg_replace_callback call Quotes the fields in a function call.

Parameters

string $match: matched string

Returns

string
quoted string

alterSchema() public ¶

alterSchema( array $compare , string $table = null )

Alter the Schema of a table.

Parameters

array $compare: Results of CakeSchema::compare()
string $table optional null: name of the table

Returns

array

Overrides

DboSource::alterSchema()

boolean() public ¶

boolean( mixed $data , boolean $quote = false )

Translates between PHP boolean values and PostgreSQL boolean values

Parameters

mixed $data: Value to be translated
boolean $quote optional false: true to quote a boolean to be used in a query, false to return the boolean value

Returns

boolean
Converted boolean value

Overrides

DboSource::boolean()

buildColumn() public ¶

buildColumn( array $column )

Generate a Postgres-native column schema string

Parameters

array $column: An array structured like the following: array('name'=>'value', 'type'=>'value'[, options]), where options can be 'default', 'length', or 'key'.

Returns

string

Overrides

DboSource::buildColumn()

buildIndex() public ¶

buildIndex( array $indexes , string $table = null )

Format indexes for create table

Parameters

array $indexes: The index to build
string $table optional null: The table name.

Returns

string

Overrides

DboSource::buildIndex()

column() public ¶

column( string $real )

Converts database-layer column types to basic types

Parameters

string $real: Real database-layer column type (i.e. "varchar(255)")

Returns

string
Abstract column type (i.e. "string")

Overrides

DataSource::column()

connect() public ¶

connect( )

Connects to the database using options in the given configuration array.

Returns

boolean
True if successfully connected.

Throws

MissingConnectionException

Overrides

DboSource::connect()

describe() public ¶

describe( Model|string $model )

Returns an array of the fields in given table name.

Parameters

Model|string $model: Name of database table to inspect

Returns

array
Fields in table. Keys are name and type

Overrides

DataSource::describe()

enabled() public ¶

enabled( )

Check if PostgreSQL is enabled/loaded

Returns

boolean

Overrides

DataSource::enabled()

fetchResult() public ¶

fetchResult( )

Fetches the next row from the current result set

Returns

array

Overrides

DboSource::fetchResult()

fields() public ¶

fields( Model $model , string $alias = null , mixed $fields = array() , boolean $quote = true )

Generates the fields list of an SQL query.

Parameters

Model $model: The model to get fields for.
string $alias optional null: Alias table name.
mixed $fields optional array(): The list of fields to get.
boolean $quote optional true: Whether or not to quote identifiers.

Returns

array

Overrides

DboSource::fields()

getEncoding() public ¶

getEncoding( )

Gets the database encoding

Returns

string
The database encoding

getSchemaName() public ¶

getSchemaName( )

Gets the schema name

Returns

string
The schema name

Overrides

DataSource::getSchemaName()

getSequence() public ¶

getSequence( string|Model $table , string $field = 'id' )

Gets the associated sequence for the given table/field

Parameters

string|Model $table: Either a full table name (with prefix) as a string, or a model object
string $field optional 'id': Name of the ID database field. Defaults to "id"

Returns

string
The associated sequence name from the sequence map, defaults to "{$table}_{$field}_seq"

index() public ¶

index( string $model )

Returns an array of the indexes in given datasource name.

Parameters

string $model: Name of model to inspect

Returns

array
Fields in table. Keys are column and unique

Overrides

DboSource::index()

lastInsertId() public ¶

lastInsertId( string $source = null , string $field = 'id' )

Returns the ID generated from the previous INSERT operation.

Parameters

string $source optional null: Name of the database table
string $field optional 'id': Name of the ID database field. Defaults to "id"

Returns

integer

Overrides

DboSource::lastInsertId()

length() public ¶

length( string $real )

Gets the length of a database-native column description, or null if no length

Parameters

string $real: Real database-layer column type (i.e. "varchar(255)")

Returns

integer
An integer representing the length of the column

Overrides

DboSource::length()

limit() public ¶

limit( integer $limit , integer $offset = null )

Returns a limit statement in the correct format for the particular database.

Parameters

integer $limit: Limit of results returned
integer $offset optional null: Offset from which to start results

Returns

string
SQL limit/offset statement

Overrides

DboSource::limit()

listSources() public ¶

listSources( mixed $data = null )

Returns an array of tables in the database. If there are no tables, an error is raised and the application exits.

Parameters

mixed $data optional null: The sources to list.

Returns

array
Array of table names in the database

Overrides

DataSource::listSources()

name() public ¶

name( string $data )

Prepares field names to be quoted by parent

Parameters

string $data: The name to format.

Returns

string
SQL field

Overrides

DboSource::name()

nestedTransactionSupported() public ¶

nestedTransactionSupported( )

Check if the server support nested transactions

Returns

boolean

Overrides

DboSource::nestedTransactionSupported()

renderStatement() public ¶

renderStatement( string $type , array $data )

Overrides DboSource::renderStatement to handle schema generation with Postgres-style indexes

Parameters

string $type: The query type.
array $data: The array of data to render.

Returns

string

Overrides

DboSource::renderStatement()

resetSequence() public ¶

resetSequence( string $table , string $column )

Reset a sequence based on the MAX() value of $column. Useful for resetting sequences after using insertMulti().

Parameters

string $table: The name of the table to update.
string $column: The column to use when resetting the sequence value, the sequence name will be fetched using Postgres::getSequence();

Returns

boolean
success.

Overrides

DboSource::resetSequence()

resultSet() public ¶

resultSet( PDOStatement $results )

resultSet method

Parameters

PDOStatement $results: The results

Overrides

DboSource::resultSet()

setEncoding() public ¶

setEncoding( mixed $enc )

Sets the database encoding

Parameters

mixed $enc: Database encoding

Returns

boolean
True on success, false on failure

truncate() public ¶

truncate( string|Model $table , boolean $reset = false )

Deletes all the records in a table and drops all associated auto-increment sequences

Parameters

string|Model $table: A string or model class representing the table to be truncated
boolean $reset optional false: true for resetting the sequence, false to leave it as is. and if 1, sequences are not modified

Returns

boolean
SQL TRUNCATE TABLE statement, false if not applicable.

Overrides

DboSource::truncate()

value() public ¶

value( string $data , string $column = null , boolean $null = true )

Returns a quoted and escaped string of $data for use in an SQL statement.

Parameters

string $data: String to be prepared for use in an SQL statement
string $column optional null: The column datatype into which this data will be inserted.
boolean $null optional true: Column allows NULL values

Returns

string
Quoted and escaped data

Overrides

DboSource::value()

Methods inherited from DboSource

__construct() public ¶

__construct( array $config = null , boolean $autoConnect = true )

Constructor

Parameters

array $config optional null: Array of configuration information for the Datasource.
boolean $autoConnect optional true: Whether or not the datasource should automatically connect.

Throws

MissingConnectionException
when a connection cannot be made.

Overrides

DataSource::__construct()

__destruct() public ¶

__destruct( )

Used for storing in cache the results of the in-memory methodCache

Overrides

DataSource::__destruct()

_beginNested() protected ¶

_beginNested( )

Begin a nested transaction

Returns

boolean

_buildFieldParameters() protected ¶

_buildFieldParameters( string $columnString , array $columnData , string $position )

Build the field parameters, in a position

Parameters

string $columnString: The partially built column string
array $columnData: The array of column data.
string $position: The position type to use. 'beforeDefault' or 'afterDefault' are common

Returns

string
a built column with the field parameters added.

_commitNested() protected ¶

_commitNested( )

Commit a nested transaction

Returns

boolean

_constructVirtualFields() protected ¶

_constructVirtualFields( Model $Model , string $alias , array $fields )

Converts model virtual fields into sql expressions to be fetched later

Parameters

Model $Model: The model to get virtual fields for.
string $alias: Alias table name
array $fields: virtual fields to be used on query

Returns

array

_dropTable() protected ¶

_dropTable( type $table )

Generate a "drop table" statement for a single table

Parameters

type $table: Name of the table to drop

Returns

string
Drop table SQL statement

_execute() protected ¶

_execute( string $sql , array $params = array() , array $prepareOptions = array() )

Executes given SQL statement.

Parameters

string $sql: SQL statement
array $params optional array(): list of params to be bound to query
array $prepareOptions optional array(): Options to be used in the prepare statement

Returns

mixed

PDOStatement if query executes with no problem, true as the result of a successful, false on error query returning no rows, such as a CREATE statement, false otherwise

Throws

PDOException

_fetchHasAndBelongsToMany() protected ¶

_fetchHasAndBelongsToMany( Model $Model , string $query , array $ids , string $association )

Fetch 'hasAndBelongsToMany' associations.

Parameters

Model $Model: Primary model object.
string $query: Association query.
array $ids: Array of IDs of associated records.
string $association: Association name.

Returns

array
Association results.

_fetchHasMany() protected ¶

_fetchHasMany( Model $Model , string $query , array $ids )

Fetch 'hasMany' associations.

Parameters

Model $Model: Primary model object.
string $query: Association query template.
array $ids: Array of IDs of associated records.

Returns

array
Association results.

_filterResults() protected ¶

_filterResults( array $resultSet , Model $Model , array $filtered = array() )

Passes association results through afterFind filters of the corresponding model.

The primary model is always excluded, because the filtering is later done by Model::_filterResults().

Parameters

array $resultSet: $resultSet Reference of resultset to be filtered.
Model $Model: Instance of model to operate against.
array $filtered optional array(): List of classes already filtered, to be skipped.

Returns

array
Array of results that have been filtered through $Model->afterFind.

_filterResultsInclusive() protected ¶

_filterResultsInclusive( array $resultSet , Model $Model , array $toBeFiltered = array() )

Passes association results through afterFind filters of the corresponding model.

Similar to DboSource::_filterResults(), but this filters only specified models. The primary model can not be specified, because this call DboSource::_filterResults() internally.

Parameters

array $resultSet: $resultSet Reference of resultset to be filtered.
Model $Model: Instance of model to operate against.
array $toBeFiltered optional array(): List of classes to be filtered.

Returns

array
Array of results that have been filtered through $Model->afterFind.

_getJoins() protected ¶

_getJoins( Model $Model )

Returns an array of SQL JOIN conditions from a model's associations.

Parameters

Model $Model: The model to get joins for.2

Returns

array

_matchRecords() protected ¶

_matchRecords( Model $Model , mixed $conditions = null )

Gets a list of record IDs for the given conditions. Used for multi-record updates and deletes in databases that do not support aliases in UPDATE/DELETE queries.

Parameters

Model $Model: The model to find matching records for.
mixed $conditions optional null: The conditions to match against.

Returns

array
List of record IDs

_mergeAssociation() protected ¶

_mergeAssociation( array $data , array $merge , string $association , string $type , boolean $selfJoin = false )

Merge association of merge into data

Parameters

array $data: $data The data to merge.
array $merge: $merge The data to merge.
string $association: The association name to merge.
string $type: The type of association
boolean $selfJoin optional false: Whether or not this is a self join.

_mergeConditions() protected ¶

_mergeConditions( mixed $query , mixed $assoc )

Merges a mixed set of string/array conditions.

Parameters

mixed $query: The query to merge conditions for.
mixed $assoc: The association names.

Returns

array

_mergeHasMany() protected ¶

_mergeHasMany( array $resultSet , array $assocResultSet , string $association , Model $Model )

Merge the results of 'hasMany' associations.

Note: this function also deals with the formatting of the data.

Parameters

array $resultSet: $resultSet Data to merge into.
array $assocResultSet: Data to merge.
string $association: Name of Model being merged.
Model $Model: Model being merged onto.

_parseKey() protected ¶

_parseKey( string $key , mixed $value , Model $Model = null )

Extracts a Model.field identifier and an SQL condition operator from a string, formats and inserts values, and composes them into an SQL snippet.

Parameters

string $key: An SQL key snippet containing a field and optional SQL operator
mixed $value: The value(s) to be inserted in the string
Model $Model optional null: Model object initiating the query

Returns

string

_prepareUpdateFields() protected ¶

_prepareUpdateFields( Model $Model , array $fields , boolean $quoteValues = true , boolean $alias = false )

Quotes and prepares fields and values for an SQL UPDATE statement

Parameters

Model $Model: The model to prepare fields for.
array $fields: The fields to update.
boolean $quoteValues optional true: If values should be quoted, or treated as SQL snippets
boolean $alias optional false: Include the model alias in the field name

Returns

array
Fields and values, quoted and prepared

_quoteFields() protected ¶

_quoteFields( string $conditions )

Quotes Model.fields

Parameters

string $conditions: The conditions to quote.

Returns

string
or false if no match

_quoteMatchedField() protected ¶

_quoteMatchedField( string $match )

Auxiliary function to quote matches Model.fields from a preg_replace_callback call

Parameters

string $match: matched string

Returns

string
quoted string

_rollbackNested() protected ¶

_rollbackNested( )

Rollback a nested transaction

Returns

boolean

_scrubQueryData() protected ¶

_scrubQueryData( array $data )

Private helper method to remove query metadata in given data array.

Parameters

array $data: The data to scrub.

Returns

array

_writeQueryCache() protected ¶

_writeQueryCache( string $sql , mixed $data , array $params = array() )

Writes a new key for the in memory sql query cache

Parameters

string $sql: SQL query
mixed $data: result of $sql query
array $params optional array(): query params bound as values

begin() public ¶

begin( )

Begin a transaction

Returns

boolean

True on success, false on fail (i.e. if the database/model does not support transactions, or a transaction has not started).

Overrides

DataSource::begin()

buildAssociationQuery() public ¶

buildAssociationQuery( Model $Model , array $queryData )

Builds an SQL statement.

This is merely a convenient wrapper to DboSource::buildStatement().

Parameters

Model $Model: The model to build an association query for.
array $queryData: An array of queryData information containing keys similar to Model::find().

Returns

string
String containing an SQL statement.

See

DboSource::buildStatement()

buildJoinStatement() public ¶

buildJoinStatement( array $join )

Builds and generates a JOIN condition from an array. Handles final clean-up before conversion.

Parameters

array $join: An array defining a JOIN condition in a query.

Returns

string
An SQL JOIN condition to be used in a query.

See

DboSource::renderJoinStatement()
DboSource::buildStatement()

buildStatement() public ¶

buildStatement( array $query , Model $Model )

Builds and generates an SQL statement from an array. Handles final clean-up before conversion.

Parameters

array $query: An array defining an SQL query.
Model $Model: The model object which initiated the query.

Returns

string
An executable SQL statement.

See

DboSource::renderStatement()

buildTableParameters() public ¶

buildTableParameters( array $parameters , string $table = null )

Format parameters for create table

Parameters

array $parameters: The parameters to create SQL for.
string $table optional null: The table name.

Returns

array

cacheMethod() public ¶

cacheMethod( string $method , string $key , mixed $value = null )

Cache a value into the methodCaches. Will respect the value of DboSource::$cacheMethods. Will retrieve a value from the cache if $value is null.

If caching is disabled and a write is attempted, the $value will be returned. A read will either return the value or null.

Parameters

string $method: Name of the method being cached.
string $key: The key name for the cache operation.
mixed $value optional null: The value to cache into memory.

Returns

mixed
Either null on failure, or the value if its set.

cacheMethodFilter() public ¶

cacheMethodFilter( string $method , string $key , mixed $value )

Filters to apply to the results of name and fields. When the filter for a given method does not return true then the result is not added to the memory cache.

Some examples:

// For method fields, do not cache values that contain floats
if ($method === 'fields') {
    $hasFloat = preg_grep('/(\d+)?\.\d+/', $value);

    return count($hasFloat) === 0;
}

return true;

// For method name, do not cache values that have the name created
if ($method === 'name') {
    return preg_match('/^`created`$/', $value) !== 1;
}

return true;

// For method name, do not cache values that have the key 472551d38e1f8bbc78d7dfd28106166f
if ($key === '472551d38e1f8bbc78d7dfd28106166f') {
    return false;
}

return true;

Parameters

string $method: Name of the method being cached.
string $key: The key name for the cache operation.
mixed $value: The value to cache into memory.

Returns

boolean
Whether or not to cache

cacheMethodHasher() public ¶

cacheMethodHasher( string $value )

Hashes a given value.

Method caching uses md5 (by default) to construct cache keys. If you have problems with collisions, try a different hashing algorithm or set DboSource::$cacheMethods to false.

Parameters

string $value: Value to hash

Returns

string
Hashed value

See

http://php.net/manual/en/function.hash-algos.php
http://softwareengineering.stackexchange.com/questions/49550/which-hashing-algorithm-is-best-for-uniqueness-and-speed

calculate() public ¶

calculate( Model $Model , string $func , array $params = array() )

Returns an SQL calculation, i.e. COUNT() or MAX()

Parameters

Model $Model: The model to get a calculated field for.
string $func: Lowercase name of SQL function, i.e. 'count' or 'max'
array $params optional array(): Function parameters (any values must be quoted manually)

Returns

string
An SQL calculation function

close() public ¶

close( )

Disconnects database, kills the connection and says the connection is closed.

Overrides

DataSource::close()

commit() public ¶

commit( )

Commit a transaction

Returns

boolean

True on success, false on fail (i.e. if the database/model does not support transactions, or a transaction has not started).

Overrides

DataSource::commit()

conditionKeysToString() public ¶

conditionKeysToString( array $conditions , boolean $quoteValues = true , Model $Model = null )

Creates a WHERE clause by parsing given conditions array. Used by DboSource::conditions().

Parameters

array $conditions: Array or string of conditions
boolean $quoteValues optional true: If true, values should be quoted
Model $Model optional null: A reference to the Model instance making the query

Returns

string
SQL fragment

conditions() public ¶

conditions( mixed $conditions , boolean $quoteValues = true , boolean $where = true , Model $Model = null )

Creates a WHERE clause by parsing given conditions data. If an array or string conditions are provided those conditions will be parsed and quoted. If a boolean is given it will be integer cast as condition. Null will return 1 = 1.

Results of this method are stored in a memory cache. This improves performance, but because the method uses a hashing algorithm it can have collisions. Setting DboSource::$cacheMethods to false will disable the memory cache.

Parameters

mixed $conditions: Array or string of conditions, or any value.
boolean $quoteValues optional true: If true, values should be quoted
boolean $where optional true: If true, "WHERE " will be prepended to the return value
Model $Model optional null: A reference to the Model instance making the query

Returns

string
SQL fragment

create() public ¶

create( Model $Model , array $fields = null , array $values = null )

The "C" in CRUD

Creates new records in the database.

Parameters

Model $Model: Model object that the record is for.
array $fields optional null: An array of field names to insert. If null, $Model->data will be used to generate field names.
array $values optional null: An array of values with keys matching the fields. If null, $Model->data will be used to generate values.

Returns

boolean
Success

Overrides

DataSource::create()

createSchema() public ¶

createSchema( CakeSchema $schema , string $tableName = null )

Generate a database-native schema for the given Schema object

Parameters

CakeSchema $schema: An instance of a subclass of CakeSchema
string $tableName optional null: Optional. If specified only the table name given will be generated. Otherwise, all tables defined in the schema are generated.

Returns

string

defaultConditions() public ¶

defaultConditions( Model $Model , string|array|boolean $conditions , boolean $useAlias = true )

Creates a default set of conditions from the model if $conditions is null/empty. If conditions are supplied then they will be returned. If a model doesn't exist and no conditions were provided either null or false will be returned based on what was input.

Parameters

Model $Model: The model to get conditions for.
string|array|boolean $conditions: Array of conditions, conditions string, null or false. If an array of conditions, or string conditions those conditions will be returned. With other values the model's existence will be checked. If the model doesn't exist a null or false will be returned depending on the input value.
boolean $useAlias optional true: Use model aliases rather than table names when generating conditions

Returns

mixed
Either null, false, $conditions or an array of default conditions to use.

See

DboSource::update()
DboSource::conditions()

delete() public ¶

delete( Model $Model , mixed $conditions = null )

Generates and executes an SQL DELETE statement. For databases that do not support aliases in UPDATE queries.

Parameters

Model $Model: The model to delete from
mixed $conditions optional null: The conditions to use. If empty the model's primary key will be used.

Returns

boolean
Success

Overrides

DataSource::delete()

disconnect() public ¶

disconnect( )

Disconnects from database.

Returns

boolean
Always true

dropSchema() public ¶

dropSchema( CakeSchema $schema , string $table = null )

Generate a "drop table" statement for the given Schema object

Parameters

CakeSchema $schema: An instance of a subclass of CakeSchema
string $table optional null: Optional. If specified only the table name given will be generated. Otherwise, all tables defined in the schema are generated.

Returns

string

execute() public ¶

execute( string $sql , array $options = array() , array $params = array() )

Queries the database with given SQL statement, and obtains some metadata about the result (rows affected, timing, any errors, number of rows in resultset). The query is also logged. If Configure::read('debug') is set, the log is shown all the time, else it is only shown on errors.

Options

log - Whether or not the query should be logged to the memory log.

Parameters

string $sql: SQL statement
array $options optional array(): The options for executing the query.
array $params optional array(): values to be bound to the query.

Returns

mixed
Resource or object representing the result set, or false on failure

expression() public ¶

expression( string $expression )

Returns an object to represent a database expression in a query. Expression objects are not sanitized or escaped.

Parameters

string $expression: An arbitrary SQL expression to be inserted into a query.

Returns

stdClass
An object representing a database expression to be used in a query

fetchAll() public ¶

fetchAll( string $sql , array|boolean $params = array() , array $options = array() )

Returns an array of all result rows for a given SQL query.

Returns false if no rows matched.

Options

cache - Returns the cached version of the query, if exists and stores the result in cache. This is a non-persistent cache, and only lasts for a single request. This option defaults to true. If you are directly calling this method, you can disable caching by setting $options to false

Parameters

string $sql: SQL statement
array|boolean $params optional array(): Either parameters to be bound as values for the SQL statement, or a boolean to control query caching.
array $options optional array(): additional options for the query.

Returns

boolean|array
Array of resultset rows, or false if no rows matched

fetchAssociated() public ¶

fetchAssociated( Model $Model , string $query , array $ids )

Fetch 'hasMany' associations.

This is just a proxy to maintain BC.

Parameters

Model $Model: Primary model object.
string $query: Association query template.
array $ids: Array of IDs of associated records.

Returns

array
Association results.

See

DboSource::_fetchHasMany()

fetchRow() public ¶

fetchRow( string $sql = null )

Returns a row from current resultset as an array

Parameters

string $sql optional null: Some SQL to be executed.

Returns

array
The fetched row as an array

fetchVirtualField() public ¶

fetchVirtualField( array $result )

Modifies $result array to place virtual fields in model entry where they belongs to

Parameters

array $result: $result Reference to the fetched row

field() public ¶

field( string $name , string $sql )

Returns a single field of the first of query results for a given SQL query, or false if empty.

Parameters

string $name: The name of the field to get.
string $sql: The SQL query.

Returns

mixed
Value of field read, or false if not found.

flushMethodCache() public ¶

flushMethodCache( )

Empties the method caches. These caches are used by DboSource::name() and DboSource::conditions()

flushQueryCache() public ¶

flushQueryCache( )

Empties the query caches.

fullTableName() public ¶

fullTableName( Model|string $model , boolean $quote = true , boolean $schema = true )

Gets full table name including prefix

Parameters

Model|string $model: Either a Model object or a string table name.
boolean $quote optional true: Whether you want the table name quoted.
boolean $schema optional true: Whether you want the schema name included.

Returns

string
Full quoted table name

generateAssociationQuery() public ¶

generateAssociationQuery( Model $Model , Model|null $LinkModel , string $type , string $association , array $assocData , array $queryData , boolean $external )

Generates a query or part of a query from a single model or two associated models.

Builds a string containing an SQL statement template.

Parameters

Model $Model: Primary Model object.
Model|null $LinkModel: Linked model object.
string $type: Association type, one of the model association types ie. hasMany.
string $association: Association name.
array $assocData: Association data.
array $queryData: $queryData An array of queryData information containing keys similar to Model::find().
boolean $external: Whether or not the association query is on an external datasource.

Returns

mixed

String representing a query. True, when $external is false and association $type is 'hasOne' or 'belongsTo'.

getConnection() public ¶

getConnection( )

Get the underlying connection object.

Returns

PDO

getConstraint() public ¶

getConstraint( string $type , Model $Model , Model $LinkModel , string $association , array $assocData , string $association2 = null )

Returns a conditions array for the constraint between two models.

Parameters

string $type: Association type.
Model $Model: Primary Model object.
Model $LinkModel: Linked model object.
string $association: Association name.
array $assocData: Association data.
string $association2 optional null: HABTM association name.

Returns

array
Conditions array defining the constraint between $Model and $LinkModel.

getLockingHint() public ¶

getLockingHint( mixed $mode )

Returns a locking hint for the given mode.

Currently, this method only returns FOR UPDATE when the mode is set to true.

Parameters

mixed $mode: Lock mode

Returns

string|null
FOR UPDATE clause or null

getLog() public ¶

getLog( boolean $sorted = false , boolean $clear = true )

Get the query log as an array.

Parameters

boolean $sorted optional false: Get the queries sorted by time taken, defaults to false.
boolean $clear optional true: If True the existing log will cleared.

Returns

array
Array of queries run as an array

getQueryCache() public ¶

getQueryCache( string $sql , array $params = array() )

Returns the result for a sql query if it is already cached

Parameters

string $sql: SQL query
array $params optional array(): query params bound as values

Returns

mixed
results for query if it is cached, false otherwise

getVersion() public ¶

getVersion( )

Gets the version string of the database server

Returns

string
The database version

group() public ¶

group( string|array $fields , Model $Model = null )

Create a GROUP BY SQL clause.

Parameters

string|array $fields: Group By fields
Model $Model optional null: The model to get group by fields for.

Returns

string
Group By clause or null.

hasAny() public ¶

hasAny( Model $Model , string $sql )

Checks if the specified table contains any record matching specified SQL

Parameters

Model $Model: Model to search
string $sql: SQL WHERE clause (condition only, not the "WHERE" part)

Returns

boolean
True if the table has a matching record, else false

hasResult() public ¶

hasResult( )

Checks if the result is valid

Returns

boolean
True if the result is valid else false

having() public ¶

having( mixed $fields , boolean $quoteValues = true , Model $Model = null )

Create a HAVING SQL clause.

Parameters

mixed $fields: Array or string of conditions
boolean $quoteValues optional true: If true, values should be quoted
Model $Model optional null: A reference to the Model instance making the query

Returns

string|null
HAVING clause or null

identifier() public ¶

identifier( string $identifier )

Returns an object to represent a database identifier in a query. Expression objects are not sanitized or escaped.

Parameters

string $identifier: A SQL expression to be used as an identifier

Returns

stdClass
An object representing a database identifier to be used in a query

insertMulti() public ¶

insertMulti( string $table , array $fields , array $values )

Inserts multiple values into a table

Parameters

string $table: The table being inserted into.
array $fields: The array of field/column names being inserted.
array $values: The array of values to insert. The values should be an array of rows. Each row should have values keyed by the column name. Each row must have the values in the same order as $fields.

Returns

boolean

introspectType() public ¶

introspectType( string $value )

Guesses the data type of an array

Parameters

string $value: The value to introspect for type data.

Returns

string

isConnected() public ¶

isConnected( )

Checks if the source is connected to the database.

Returns

boolean
True if the database is connected, else false

lastAffected() public ¶

lastAffected( mixed $source = null )

Returns number of affected rows in previous database operation. If no previous operation exists, this returns false.

Parameters

mixed $source optional null: The source to check.

Returns

integer
Number of affected rows

Overrides

DataSource::lastAffected()

lastError() public ¶

lastError( PDOStatement $query = null )

Returns a formatted error message from previous database operation.

Parameters

PDOStatement $query optional null: the query to extract the error from if any

Returns

string
Error message with error number

lastNumRows() public ¶

lastNumRows( mixed $source = null )

Returns number of rows in previous resultset. If no previous resultset exists, this returns false.

Parameters

mixed $source optional null: Not used

Returns

integer
Number of rows in resultset

Overrides

DataSource::lastNumRows()

logQuery() public ¶

logQuery( string $sql , array $params = array() )

Log given SQL query.

Parameters

string $sql: SQL statement
array $params optional array(): Values binded to the query (prepared statements)

order() public ¶

order( array|string $keys , string $direction = 'ASC' , Model $Model = null )

Returns an ORDER BY clause as a string.

Parameters

array|string $keys: Field reference, as a key (i.e. Post.title)
string $direction optional 'ASC': Direction (ASC or DESC)
Model $Model optional null: Model reference (used to look for virtual field)

Returns

string
ORDER BY clause

prepareFields() public ¶

prepareFields( Model $Model , array $queryData )

Prepares fields required by an SQL statement.

When no fields are set, all the $Model fields are returned.

Parameters

Model $Model: The model to prepare.
array $queryData: An array of queryData information containing keys similar to Model::find().

Returns

array
Array containing SQL fields.

query() public ¶

query( )

DataSource Query abstraction

Returns

resource
Result resource identifier.

queryAssociation() public ¶

queryAssociation( Model $Model , Model $LinkModel , string $type , string $association , array $assocData , array $queryData , boolean $external , array $resultSet , integer $recursive , array $stack )

Queries associations.

Used to fetch results on recursive models.

'hasMany' associations with no limit set: Fetch, filter and merge is done recursively for every level.
'hasAndBelongsToMany' associations: Fetch and filter is done unaffected by the (recursive) level set.

Parameters

Model $Model: Primary Model object.
Model $LinkModel: Linked model object.
string $type: Association type, one of the model association types ie. hasMany.
string $association: Association name.
array $assocData: Association data.
array $queryData: $queryData An array of queryData information containing keys similar to Model::find().
boolean $external: Whether or not the association query is on an external datasource.
array $resultSet: $resultSet Existing results.
integer $recursive: Number of levels of association.
array $stack: A list with joined models.

Returns

mixed

Throws

CakeException
when results cannot be created.

rawQuery() public ¶

rawQuery( string $sql , array $params = array() )

Executes given SQL statement.

Parameters

string $sql: SQL statement
array $params optional array(): Additional options for the query.

Returns

mixed
Resource or object representing the result set, or false on failure

read() public ¶

read( Model $Model , array $queryData = array() , integer $recursive = null )

The "R" in CRUD

Reads record(s) from the database.

Parameters

Model $Model: A Model object that the query is for.
array $queryData optional array(): An array of queryData information containing keys similar to Model::find().
integer $recursive optional null: Number of levels of association

Returns

mixed
boolean false on error/failure. An array of results on success.

Overrides

DataSource::read()

readTableParameters() public ¶

readTableParameters( string $name )

Read additional table parameters

Parameters

string $name: The table name to read.

Returns

array

reconnect() public ¶

reconnect( array $config = array() )

Reconnects to database server with optional new settings

Parameters

array $config optional array(): An array defining the new configuration settings

Returns

boolean
True on success, false on failure

renderJoinStatement() public ¶

renderJoinStatement( array $data )

Renders a final SQL JOIN statement

Parameters

array $data: The data to generate a join statement for.

Returns

string

resolveKey() public ¶

resolveKey( Model $Model , string $key , string $assoc = null )

Returns a key formatted like a string Model.fieldname(i.e. Post.title, or Country.name)

Parameters

Model $Model: The model to get a key for.
string $key: The key field.
string $assoc optional null: The association name.

Returns

string

Overrides

DataSource::resolveKey()

rollback() public ¶

rollback( )

Rollback a transaction

Returns

boolean

True on success, false on fail (i.e. if the database/model does not support transactions, or a transaction has not started).

Overrides

DataSource::rollback()

showLog() public ¶

showLog( boolean $sorted = false )

Outputs the contents of the queries log. If in a non-CLI environment the sql_log element will be rendered and output. If in a CLI environment, a plain text log is generated.

Parameters

boolean $sorted optional false: Get the queries sorted by time taken, defaults to false.

update() public ¶

update( Model $Model , array $fields = array() , array $values = null , mixed $conditions = null )

Generates and executes an SQL UPDATE statement for given model, fields, and values. For databases that do not support aliases in UPDATE queries.

Parameters

Model $Model: The model to update.
array $fields optional array(): The fields to update
array $values optional null: The values fo the fields.
mixed $conditions optional null: The conditions for the update. When non-empty $values will not be quoted.

Returns

boolean
Success

Overrides

DataSource::update()

Methods inherited from DataSource

_cacheDescription() protected ¶

_cacheDescription( string $object , mixed $data = null )

Cache the DataSource description

Parameters

string $object: The name of the object (model) to cache
mixed $data optional null: The description of the model, usually a string or array

Returns

mixed

insertQueryData() public ¶

insertQueryData( string $query , array $data , string $association , Model $Model , array $stack )

Replaces {$__cakeID__$} and {$__cakeForeignKey__$} placeholders in query data.

Parameters

string $query: Query string needing replacements done.
array $data: Array of data with values that will be inserted in placeholders.
string $association: Name of association model being replaced.
Model $Model: Model instance.
array $stack: The context stack.

Returns

mixed
String of query data with placeholders replaced, or false on failure.

setConfig() public ¶

setConfig( array $config = array() )

Sets the configuration for the DataSource. Merges the $config information with the _baseConfig and the existing $config property.

Parameters

array $config optional array(): The configuration array

Methods inherited from CakeObject

_mergeVars() protected ¶

_mergeVars( array $properties , string $class , boolean $normalize = true )

Merges this objects $property with the property in $class' definition. This classes value for the property will be merged on top of $class'

This provides some of the DRY magic CakePHP provides. If you want to shut it off, redefine this method as an empty function.

Parameters

array $properties: The name of the properties to merge.
string $class: The class to merge the property with.
boolean $normalize optional true: Set to true to run the properties through Hash::normalize() before merging.

_set() protected ¶

_set( array $properties = array() )

Allows setting of multiple properties of the object in a single line of code. Will only set properties that are part of a class declaration.

Parameters

array $properties optional array(): An associative array containing properties and corresponding values.

_stop() protected ¶

_stop( integer|string $status = 0 )

Stop execution of the current script. Wraps exit() making testing easier.

Parameters

integer|string $status optional 0: see http://php.net/exit for values

dispatchMethod() public ¶

dispatchMethod( string $method , array $params = array() )

Calls a method on this object with the given parameters. Provides an OO wrapper for call_user_func_array

Parameters

string $method: Name of the method to call
array $params optional array(): Parameter list to use when calling $method

Returns

mixed
Returns the result of the method call

log() public ¶

log( mixed $msg , integer $type = LOG_ERR , null|string|array $scope = null )

Convenience method to write a message to CakeLog. See CakeLog::write() for more information on writing to logs.

Parameters

mixed $msg: Log message
integer $type optional LOG_ERR: Error type constant. Defined in app/Config/core.php.
null|string|array $scope optional null: The scope(s) a log message is being created in. See CakeLog::config() for more information on logging scopes.

Returns

boolean
Success of log write

requestAction() public ¶

requestAction( string|array $url , array $extra = array() )

Calls a controller's method from any location. Can be used to connect controllers together or tie plugins into a main application. requestAction can be used to return rendered views or fetch the return value from controller actions.

Under the hood this method uses Router::reverse() to convert the $url parameter into a string URL. You should use URL formats that are compatible with Router::reverse()

Passing POST and GET data

POST and GET data can be simulated in requestAction. Use $extra['url'] for GET data. The $extra['data'] parameter allows POST data simulation.

Parameters

string|array $url: String or array-based URL. Unlike other URL arrays in CakePHP, this URL will not automatically handle passed and named arguments in the $url parameter.
array $extra optional array(): if array includes the key "return" it sets the AutoRender to true. Can also be used to submit GET/POST data, and named/passed arguments.

Returns

mixed

Boolean true or false on success/failure, or contents of rendered action if 'return' is set in $extra.

toString() public ¶

toString( )

CakeObject-to-string conversion. Each class can override this method as necessary.

Returns

string
The name of this class

Properties detail

`$_baseConfig` ¶

protected array

Base driver configuration settings. Merged with user settings.

array(
    'persistent' => true,
    'host' => 'localhost',
    'login' => 'root',
    'password' => '',
    'database' => 'cake',
    'schema' => 'public',
    'port' => 5432,
    'encoding' => '',
    'sslmode' => 'allow',
    'flags' => array()
)

`$_sequenceMap` ¶

protected array

Contains mappings of custom auto-increment sequences, if a table uses a sequence name other than what is dictated by convention.

array()

`$_sqlOps` ¶

protected array

The set of valid SQL operations usable in a WHERE statement

array('like', 'ilike', 'or', 'not', 'in', 'between', '~', '~\*', '\!~', '\!~\*', 'similar to')

`$columns` ¶

public array

Columns

Link

PostgreSQL Data Types

array(
    'primary_key' => array('name' => 'serial NOT NULL'),
    'string' => array('name' => 'varchar', 'limit' => '255'),
    'text' => array('name' => 'text'),
    'integer' => array('name' => 'integer', 'formatter' => 'intval'),
    'smallinteger' => array('name' => 'smallint', 'formatter' => 'intval'),
    'tinyinteger' => array('name' => 'smallint', 'formatter' => 'intval'),
    'biginteger' => array('name' => 'bigint', 'limit' => '20'),
    'float' => array('name' => 'float', 'formatter' => 'floatval'),
    'decimal' => array('name' => 'decimal', 'formatter' => 'floatval'),
    'datetime' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
    'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
    'time' => array('name' => 'time', 'format' => 'H:i:s', 'formatter' => 'date'),
    'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),
    'binary' => array('name' => 'bytea'),
    'boolean' => array('name' => 'boolean'),
    'number' => array('name' => 'numeric'),
    'inet' => array('name' => 'inet'),
    'uuid' => array('name' => 'uuid')
)

`$description` ¶

public string

Driver description

"PostgreSQL DBO Driver"

`$endQuote` ¶

public string

Ending Quote

'"'

`$startQuote` ¶

public string

Starting Quote

'"'

Packages

Classes

Class Postgres

Properties summary

Inherited Properties

Method Summary

_alterIndexes() protected

_quoteFunctionField() protected

alterSchema() public

boolean() public

buildColumn() public

buildIndex() public

column() public

connect() public

describe() public

enabled() public

fetchResult() public

fields() public

getEncoding() public

getSchemaName() public

getSequence() public

index() public

lastInsertId() public

length() public

limit() public

listSources() public

name() public

nestedTransactionSupported() public

renderStatement() public

resetSequence() public

resultSet() public

setEncoding() public

truncate() public

value() public

Method Detail

_alterIndexes() protected ¶

Parameters

Returns

_quoteFunctionField() protected ¶

Parameters

Returns

alterSchema() public ¶

Parameters

Returns

Overrides

boolean() public ¶

Parameters

Returns

Overrides

buildColumn() public ¶

Parameters

Returns

Overrides

buildIndex() public ¶

Parameters

Returns

Overrides

column() public ¶

Parameters

Returns

Overrides

connect() public ¶

Returns

Throws

Overrides

describe() public ¶

Parameters

Returns

Overrides

enabled() public ¶

Returns

Overrides

fetchResult() public ¶

Returns

Overrides

fields() public ¶

Parameters

Returns

Overrides

getEncoding() public ¶