Class Postgres

Class Postgres

Constants summary

  • int|null
    MAX_ALIAS_LENGTH
    63

Properties summary

  • $_autoQuoting protected
    bool

    Indicates whether or not the driver is doing automatic identifier quoting for all queries

  • $_baseConfig protected
    array

    Base configuration settings for Postgres driver

  • $_config protected
    array

    Configuration data.

  • $_connection protected
    \PDO

    Instance of PDO.

  • $_endQuote protected
    string

    String used to end a database identifier quoting to make it safe

  • $_schemaDialect protected
    \Cake\Database\Schema\PostgresSchema

    The schema dialect class for this driver

  • $_startQuote protected
    string

    String used to start a database identifier quoting to make it safe

Method Summary

Method Detail

__construct() public

__construct(array $config)

Constructor

Parameters

array $config optional

The configuration for the driver.

Throws

InvalidArgumentException

__debugInfo() public

__debugInfo()

Returns an array that can be used to describe the internal state of this object.

Returns

array

__destruct() public

__destruct()

Destructor

_connect() protected

_connect(string $dsn, array $config)

Establishes a connection to the database server

Parameters

string $dsn

A Driver-specific PDO-DSN

array $config

configuration to be used for creating connection

Returns

bool

true on success

_deleteQueryTranslator() protected

_deleteQueryTranslator(\Cake\Database\Query $query)

Apply translation steps to delete queries.

Chops out aliases on delete query conditions as most database dialects do not support aliases in delete queries. This also removes aliases in table names as they frequently don't work either.

We are intentionally not supporting deletes with joins as they have even poorer support.

Parameters

\Cake\Database\Query $query

The query to translate

Returns

\Cake\Database\Query

The modified query

_expressionTranslators() protected

_expressionTranslators()

Returns a dictionary of expressions to be transformed when compiling a Query to SQL. Array keys are method names to be called in this class

Returns

array

_insertQueryTranslator() protected

_insertQueryTranslator(\Cake\Database\Query $query)

Modifies the original insert query to append a "RETURNING *" epilogue so that the latest insert id can be retrieved

Parameters

\Cake\Database\Query $query

The query to translate.

Returns

\Cake\Database\Query

_removeAliasesFromConditions() protected

_removeAliasesFromConditions(\Cake\Database\Query $query)

Removes aliases from the WHERE clause of a query.

Parameters

\Cake\Database\Query $query

The query to process.

Returns

\Cake\Database\Query

The modified query.

Throws

RuntimeException
In case the processed query contains any joins, as removing aliases from the conditions can break references to the joined tables.

_selectQueryTranslator() protected

_selectQueryTranslator(\Cake\Database\Query $query)

Apply translation steps to select queries.

Parameters

\Cake\Database\Query $query

The query to translate

Returns

\Cake\Database\Query

The modified query

_transformDistinct() protected

_transformDistinct(\Cake\Database\Query $query)

Distinct clause needs no transformation

Parameters

\Cake\Database\Query $query

The query to be transformed

Returns

\Cake\Database\Query

_transformFunctionExpression() protected

_transformFunctionExpression(\Cake\Database\Expression\FunctionExpression $expression)

Receives a FunctionExpression and changes it so that it conforms to this SQL dialect.

Parameters

\Cake\Database\Expression\FunctionExpression $expression

The function expression to convert to postgres SQL.

_updateQueryTranslator() protected

_updateQueryTranslator(\Cake\Database\Query $query)

Apply translation steps to update queries.

Chops out aliases on update query conditions as not all database dialects do support aliases in update queries.

Just like for delete queries, joins are currently not supported for update queries.

Parameters

\Cake\Database\Query $query

The query to translate

Returns

\Cake\Database\Query

The modified query

beginTransaction() public

beginTransaction()

Starts a transaction.

Returns

bool

True on success, false otherwise.

commitTransaction() public

commitTransaction()

Commits a transaction.

Returns

bool

True on success, false otherwise.

compileQuery() public

compileQuery(\Cake\Database\Query $query, \Cake\Database\ValueBinder $generator)

Transforms the passed query to this Driver's dialect and returns an instance of the transformed query and the full compiled SQL string.

Parameters

\Cake\Database\Query $query

The query to compile.

\Cake\Database\ValueBinder $generator

The value binder to use.

Returns

array

containing 2 entries. The first entity is the transformed query and the second one the compiled SQL.

connect() public

connect()

Establishes a connection to the database server

Returns

bool

true on success

disableAutoQuoting() public

disableAutoQuoting()

Disable auto quoting of identifiers in queries.

Returns

$this

disableForeignKeySQL() public

disableForeignKeySQL()

Get the SQL for disabling foreign keys.

Returns

string

disconnect() public

disconnect()

Disconnects from database server.

enableAutoQuoting() public

enableAutoQuoting(bool $enable)

Sets whether or not this driver should automatically quote identifiers in queries.

Parameters

bool $enable optional

Whether to enable auto quoting

Returns

$this

enableForeignKeySQL() public

enableForeignKeySQL()

Get the SQL for enabling foreign keys.

Returns

string

enabled() public

enabled()

Returns whether php is able to use this driver for connecting to database

Returns

bool

true if it is valid to use this driver

getConnection() public

getConnection()

Get the internal PDO connection instance.

Returns

\PDO

getMaxAliasLength() public

getMaxAliasLength()

Returns the maximum alias length allowed.

This can be different than the maximum identifier length for columns.

Returns

int|null

Maximum alias length or null if no limit

isAutoQuotingEnabled() public

isAutoQuotingEnabled()

Returns whether or not this driver should automatically quote identifiers in queries.

Returns

bool

isConnected() public

isConnected()

Checks whether or not the driver is connected.

Returns

bool

lastInsertId() public

lastInsertId(?string $table, ?string $column)

Returns last id generated for a table or sequence in database.

Parameters

string|null $table optional

table name or sequence to get last insert value from.

string|null $column optional

the name of the column representing the primary key.

Returns

string|int

newCompiler() public

newCompiler()

Returns an instance of a QueryCompiler.

Returns

\Cake\Database\PostgresCompiler

newTableSchema() public

newTableSchema(string $table, array $columns)

Constructs new TableSchema.

Parameters

string $table

The table name.

array $columns optional

The list of columns for the schema.

Returns

\Cake\Database\Schema\TableSchema

prepare() public

prepare(mixed $query)

Prepares a sql statement to be executed.

Parameters

string|\Cake\Database\Query $query

The query to turn into a prepared statement.

Returns

\Cake\Database\StatementInterface

queryTranslator() public

queryTranslator(string $type)

Returns a callable function that will be used to transform a passed Query object.

This function, in turn, will return an instance of a Query object that has been transformed to accommodate any specificities of the SQL dialect in use.

Parameters

string $type

the type of query to be transformed (select, insert, update, delete)

Returns

\Closure

quote() public

quote(mixed $value, mixed $type)

Returns a value in a safe representation to be used in a query string

Parameters

mixed $value

The value to quote.

int $type optional

Type to be used for determining kind of quoting to perform.

Returns

string

quoteIdentifier() public

quoteIdentifier(string $identifier)

Quotes a database identifier (a column name, table name, etc..) to be used safely in queries without the risk of using reserved words

Parameters

string $identifier

The identifier to quote.

Returns

string

releaseSavePointSQL() public

releaseSavePointSQL(mixed $name)

Returns a SQL snippet for releasing a previously created save point

Parameters

string|int $name

save point name

Returns

string

rollbackSavePointSQL() public

rollbackSavePointSQL(mixed $name)

Returns a SQL snippet for rollbacking a previously created save point

Parameters

string|int $name

save point name

Returns

string

rollbackTransaction() public

rollbackTransaction()

Rollbacks a transaction.

Returns

bool

True on success, false otherwise.

savePointSQL() public

savePointSQL(mixed $name)

Returns a SQL snippet for creating a new transaction savepoint

Parameters

string|int $name

save point name

Returns

string

schema() public

schema()

Returns the schema name that's being used.

Returns

string

schemaDialect() public

schemaDialect()

Get the schema dialect.

Used by Cake\Database\Schema package to reflect schema and generate schema.

Returns

\Cake\Database\Schema\BaseSchema

schemaValue() public

schemaValue(mixed $value)

Escapes values for use in schema definitions.

Parameters

mixed $value

The value to escape.

Returns

string

String for use in schema definitions.

setConnection() public

setConnection(mixed $connection)

Set the internal PDO connection instance.

Parameters

\PDO $connection

PDO instance.

Returns

$this

setEncoding() public

setEncoding(string $encoding)

Sets connection encoding

Parameters

string $encoding

The encoding to use.

setSchema() public

setSchema(string $schema)

Sets connection default schema, if any relation defined in a query is not fully qualified postgres will fallback to looking the relation into defined default schema

Parameters

string $schema

The schema names to set search_path to.

supportsDynamicConstraints() public

supportsDynamicConstraints()

Returns whether the driver supports adding or dropping constraints to already created tables.

Returns

bool

True if driver supports dynamic constraints.

supportsQuoting() public

supportsQuoting()

Checks if the driver supports quoting, as PDO_ODBC does not support it.

Returns

bool

supportsSavePoints() public

supportsSavePoints()

Returns whether this driver supports save points for nested transactions.

Returns

bool

True if save points are supported, false otherwise.

Property Detail

$_autoQuoting protected

Indicates whether or not the driver is doing automatic identifier quoting for all queries

Type

bool

$_baseConfig protected

Base configuration settings for Postgres driver

Type

array

$_config protected

Configuration data.

Type

array

$_connection protected

Instance of PDO.

Type

\PDO

$_endQuote protected

String used to end a database identifier quoting to make it safe

Type

string

$_schemaDialect protected

The schema dialect class for this driver

Type

\Cake\Database\Schema\PostgresSchema

$_startQuote protected

String used to start a database identifier quoting to make it safe

Type

string

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https://api.cakephp.org/4.0/class-Cake.Database.Driver.Postgres.html