abstract class DBConnector (View source)

Represents an object responsible for wrapping DB connector api

Properties

Methods

protected
databaseError(string $msg, int $errorLevel = E_USER_ERROR, string $sql = null, array $parameters = array())

Error handler for database errors.

public
bool
isQueryMutable(string $sql)

Determine if this SQL statement is a destructive operation (write or ddl)

public
bool
isQueryDDL(string $sql)

Determine if this SQL statement is a DDL operation

public
bool
isQueryWrite(string $sql)

Determine if this SQL statement is a write operation (alters content but not structure)

protected
isQueryType(string $sql, string|array $type)

Determine if a query is of the given type

protected
array
parameterValues(array $parameters)

Extracts only the parameter values for error reporting

public
connect(array $parameters, bool $selectDB = false)

Link this connector to the database given the specified parameters Will throw an exception rather than return a success state.

public
string
getVersion()

Query for the version of the currently connected database

public
string
escapeString(string $value)

Given a value escape this for use in a query for the current database connector. Note that this does not quote the value.

public
string
quoteString(string $value)

Given a value escape and quote this appropriately for the current database connector.

public
escapeIdentifier(string $value, string $separator = '.')

Escapes an identifier (table / database name). Typically the value is simply double quoted. Don't pass in already escaped identifiers in, as this will double escape the value!

public
query(string $sql, int $errorLevel = E_USER_ERROR)

Executes the following query with the specified error level.

public
preparedQuery(string $sql, array $parameters, int $errorLevel = E_USER_ERROR)

Execute the given SQL parameterised query with the specified arguments

public
bool
selectDatabase(string $name)

Select a database by name

public
string
getSelectedDatabase()

Retrieves the name of the currently selected database

public
unloadDatabase()

De-selects the currently selected database

public
string
getLastError()

Retrieves the last error generated from the database connection

public
int
getGeneratedID(string $table)

Determines the last ID generated from the specified table.

public
int
affectedRows()

Determines the number of affected rows from the last SQL query

public
bool
isActive()

Determines if we are connected to a server AND have a valid database selected.

Details

protected databaseError(string $msg, int $errorLevel = E_USER_ERROR, string $sql = null, array $parameters = array())

Error handler for database errors.

All database errors will call this function to report the error. It isn't a static function; it will be called on the object itself and as such can be overridden in a subclass. Subclasses should run all errors through this function.

hook this into a more well-structured error handling system.

Parameters

string $msg

The error message.

int $errorLevel

The level of the error to throw.

string $sql

The SQL related to this query

array $parameters

Parameters passed to the query

Exceptions

SS_DatabaseException

bool isQueryMutable(string $sql)

Determine if this SQL statement is a destructive operation (write or ddl)

Parameters

string $sql

Return Value

bool

bool isQueryDDL(string $sql)

Determine if this SQL statement is a DDL operation

Parameters

string $sql

Return Value

bool

bool isQueryWrite(string $sql)

Determine if this SQL statement is a write operation (alters content but not structure)

Parameters

string $sql

Return Value

bool

protected isQueryType(string $sql, string|array $type)

Determine if a query is of the given type

Parameters

string $sql

Raw SQL

string|array $type

Type or list of types (first word in the query). Must be lowercase

protected array parameterValues(array $parameters)

Extracts only the parameter values for error reporting

Parameters

array $parameters

Return Value

array

List of parameter values

abstract connect(array $parameters, bool $selectDB = false)

Link this connector to the database given the specified parameters Will throw an exception rather than return a success state.

The connector should not select the database once connected until explicitly called by selectDatabase()

Parameters

array $parameters

List of parameters such as

  • type
  • server
  • username
  • password
  • database
  • path
bool $selectDB

By default database selection should be handled by the database controller (to enable database creation on the fly if necessary), but some interfaces require that the database is specified during connection (SQLite, Azure, etc).

abstract string getVersion()

Query for the version of the currently connected database

Return Value

string

Version of this database

abstract string escapeString(string $value)

Given a value escape this for use in a query for the current database connector. Note that this does not quote the value.

Parameters

string $value

The value to be escaped

Return Value

string

The appropritaely escaped string for value

abstract string quoteString(string $value)

Given a value escape and quote this appropriately for the current database connector.

Parameters

string $value

The value to be injected into a query

Return Value

string

The appropriately escaped and quoted string for $value

escapeIdentifier(string $value, string $separator = '.')

Escapes an identifier (table / database name). Typically the value is simply double quoted. Don't pass in already escaped identifiers in, as this will double escape the value!

Parameters

string $value

The identifier to escape

string $separator

optional identifier splitter

abstract query(string $sql, int $errorLevel = E_USER_ERROR)

Executes the following query with the specified error level.

Implementations of this function should respect previewWrite and benchmarkQuery

Parameters

string $sql

The SQL query to execute

int $errorLevel

For errors to this query, raise PHP errors using this error level.

See also

http://php.net/manual/en/errorfunc.constants.php

abstract SS_Query preparedQuery(string $sql, array $parameters, int $errorLevel = E_USER_ERROR)

Execute the given SQL parameterised query with the specified arguments

Parameters

string $sql

The SQL query to execute. The ? character will denote parameters.

array $parameters

An ordered list of arguments.

int $errorLevel

The level of error reporting to enable for the query

Return Value

SS_Query

abstract bool selectDatabase(string $name)

Select a database by name

Parameters

string $name

Name of database

Return Value

bool

Flag indicating success

abstract string getSelectedDatabase()

Retrieves the name of the currently selected database

Return Value

string

Name of the database, or null if none selected

abstract unloadDatabase()

De-selects the currently selected database

abstract string getLastError()

Retrieves the last error generated from the database connection

Return Value

string

The error message

abstract int getGeneratedID(string $table)

Determines the last ID generated from the specified table.

Note that some connectors may not be able to return $table specific responses, and this parameter may be ignored.

Parameters

string $table

The target table to return the last generated ID for

Return Value

int

ID value

abstract int affectedRows()

Determines the number of affected rows from the last SQL query

Return Value

int

Number of affected rows

abstract bool isActive()

Determines if we are connected to a server AND have a valid database selected.

Return Value

bool

Flag indicating that a valid database is connected