Documentation

Connection extends BaseConnection
in package

Application

Connection for MySQLi

$connID : object|resource|bool: Connection ID
$dataCache : array<string|int, mixed>: Holds previously looked up data for performance reasons.
$DBDriver : string: Database driver
$deleteHack : bool: DELETE hack flag
$escapeChar : string: Identifier escape character
$likeEscapeChar : string: ESCAPE character
$likeEscapeStr : string: ESCAPE statement string
$mysqli : MySQLi: MySQLi object
$protectIdentifiers : bool: Protect identifiers flag
$resultID : object|resource|bool: Result ID
$transEnabled : bool: Transaction enabled flag
$transStrict : bool: Strict transaction mode flag
$aliasedTables : array<string|int, mixed>: Array of table aliases.
$charset : string: Character set
$compress : bool: Compression flag
$connectDuration : float: How long it took to establish connection.
$connectTime : float: Microtime when connection was made
$database : string: Database name
$DBCollat : string: Collation
$DBDebug : bool: Debug flag
$DBPrefix : string: Table prefix
$DSN : string: Data Source Name / Connect string
$encrypt : mixed: Encryption flag/data
$failover : array<string|int, mixed>: Settings for a failover connection.
$hostname : string: Hostname
$lastQuery : mixed: The last query object that was executed on this connection.
$password : string: Password
$pConnect : bool: Persistent connection flag
$port : int|string: Database port
$pretend : bool: If true, no queries will actually be ran against the database.
$queryClass : string: Query Class
$reservedIdentifiers : array<string|int, mixed>: List of reserved identifiers
$strictOn : bool: Strict ON flag
$subdriver : string: Sub-driver
$swapPre : string: Swap Prefix
$transDepth : int: Transaction depth level
$transFailure : bool: Transaction failure flag
$transStatus : bool: Transaction status flag
$username : string: Username
__construct() : mixed: Saves our connection settings.
__get() : mixed: Accessor for properties if they exist.
__isset() : bool: Checker for properties existence.
_fieldData() : array<string|int, stdClass>: Returns an array of objects with field data
_foreignKeyData() : array<string|int, stdClass>: Returns an array of objects with Foreign key data
_indexData() : array<string|int, stdClass>: Returns an array of objects with index data
addTableAlias() : $this: Add a table alias to our list.
affectedRows() : int: Returns the total number of rows affected by this query.
callFunction() : bool: This function enables you to call PHP database functions that are not natively included in CodeIgniter, in a platform independent manner.
close() : void: Close the database connection.
connect() : mixed: Connect to the database.
disableForeignKeyChecks() : mixed: Disables foreign key checks temporarily.
enableForeignKeyChecks() : mixed: Enables foreign key checks temporarily.
error() : array<string, string|int>: Returns the last error code and message.
escape() : mixed: "Smart" Escape String
escapeIdentifiers() : mixed: Escape the SQL Identifiers
escapeLikeString() : string|array<string|int, string>: Escape LIKE String
escapeLikeStringDirect() : string|array<string|int, string>: Escape Like String Direct There are a few instances where MySQLi queries cannot take the additional "ESCAPE x" parameter for specifying the escape character in "LIKE" strings, and this handles those directly with a backslash.
escapeString() : string|array<string|int, string>: Escape String
execute() : mixed: Executes the query against the database.
fieldExists() : bool: Determine if a particular field exists
getConnectDuration() : string: Returns the number of seconds with microseconds that it took to connect to the database.
getConnection() : mixed: Returns the actual connection object. If both a 'read' and 'write' connection has been specified, you can pass either term in to get that connection. If you pass either alias in and only a single connection is present, it must return the sole connection.
getConnectStart() : float|null: Returns the time we started to connect to this database in seconds with microseconds.
getDatabase() : string: Returns the name of the current database being used.
getFieldData() : array<string|int, mixed>: Returns an object with field data
getFieldNames() : array<string|int, mixed>|false: Fetch Field Names
getForeignKeyData() : array<string|int, mixed>: Returns an object with foreign key data
getIndexData() : array<string|int, mixed>: Returns an object with key data
getLastQuery() : mixed: Returns the last query's statement object.
getPlatform() : string: The name of the platform in use (MySQLi, mssql, etc)
getPrefix() : string: Returns the database prefix.
getVersion() : string: Returns a string containing the version of the database being used.
initialize() : mixed|void: Initializes the database connection/settings.
insertID() : int: Insert ID
isWriteType() : bool: Determines if the statement is a write-type query or not.
listTables() : bool|array<string|int, mixed>: Returns an array of table names
persistentConnect() : mixed: Create a persistent database connection.
prefixTable() : string: Prepends a database prefix if one exists in configuration
prepare() : BasePreparedQuery|null: Creates a prepared statement with the database that can then be used to execute multiple statements against. Within the closure, you would build the query in any normal way, though the Query Builder is the expected manner.
pretend() : $this: Allows the engine to be set into a mode where queries are not actually executed, but they are still generated, timed, etc.
protectIdentifiers() : string|array<string|int, mixed>: Protect Identifiers
query() : BaseResult|Query|bool: Orchestrates a query against the database. Queries must use Database\Statement objects to store the query and build it.
reconnect() : void: Keep or establish the connection if no queries have been sent for a length of time exceeding the server's idle timeout.
resetDataCache() : $this: Empties our data cache. Especially helpful during testing.
setAliasedTables() : $this: Sets the Table Aliases to use. These are typically collected during use of the Builder, and set here so queries are built correctly.
setDatabase() : bool: Select a specific database table to use.
setPrefix() : string: Set DB Prefix
showLastQuery() : string: Returns a string representation of the last query's statement object.
simpleQuery() : mixed: Performs a basic query against the database. No binding or caching is performed, nor are transactions handled. Simply takes a raw query string and returns the database-specific result id.
table() : BaseBuilder: Returns an instance of the query builder for this connection.
tableExists() : bool: Determine if a particular table exists
transBegin() : bool: Begin Transaction
transCommit() : bool: Commit Transaction
transComplete() : bool: Complete Transaction
transOff() : void: Disable Transactions
transRollback() : bool: Rollback Transaction
transStart() : bool: Start Transaction
transStatus() : bool: Lets you retrieve the transaction flag to determine if it has failed
transStrict() : $this: Enable/disable Transaction Strict Mode
_close() : void: Close the database connection.
_disableForeignKeyChecks() : string: Returns platform-specific SQL to disable foreign key checks.
_enableForeignKeyChecks() : string: Returns platform-specific SQL to enable foreign key checks.
_escapeString() : string: Platform-dependant string escape
_listColumns() : string: Generates a platform-specific query string so that the column names can be fetched.
_listTables() : string: Generates the SQL for listing tables in a platform-dependent manner.
_transBegin() : bool: Begin Transaction
_transCommit() : bool: Commit Transaction
_transRollback() : bool: Rollback Transaction
prepQuery() : string: Prep the query

$connID

Connection ID


    public
        object|resource|bool
    $connID
     = false

$dataCache

Holds previously looked up data for performance reasons.


    public
        array<string|int, mixed>
    $dataCache
     = []

$DBDriver

Database driver


    public
        string
    $DBDriver
     = 'MySQLi'

$deleteHack

DELETE hack flag


    public
        bool
    $deleteHack
     = true

Whether to use the MySQL "delete hack" which allows the number of affected rows to be shown. Uses a preg_replace when enabled, adding a bit more processing to all queries.

$escapeChar

Identifier escape character


    public
        string
    $escapeChar
     = '`'

$likeEscapeChar

ESCAPE character


    public
        string
    $likeEscapeChar
     = '!'

$likeEscapeStr

ESCAPE statement string


    public
        string
    $likeEscapeStr
     = " ESCAPE '%s' "

$mysqli

MySQLi object


    public
        MySQLi
    $mysqli

Has to be preserved without being assigned to $conn_id.

$protectIdentifiers

Protect identifiers flag


    public
        bool
    $protectIdentifiers
     = true

$resultID

Result ID


    public
        object|resource|bool
    $resultID
     = false

$transEnabled

Transaction enabled flag


    public
        bool
    $transEnabled
     = true

$transStrict

Strict transaction mode flag


    public
        bool
    $transStrict
     = true

$aliasedTables

Array of table aliases.


    protected
        array<string|int, mixed>
    $aliasedTables
     = []

$charset

Character set


    protected
        string
    $charset
     = 'utf8'

$compress

Compression flag


    protected
        bool
    $compress
     = false

$connectDuration

How long it took to establish connection.


    protected
        float
    $connectDuration

$connectTime

Microtime when connection was made


    protected
        float
    $connectTime

$database

Database name


    protected
        string
    $database

$DBCollat

Collation


    protected
        string
    $DBCollat
     = 'utf8_general_ci'

$DBDebug

Debug flag


    protected
        bool
    $DBDebug
     = false

Whether to display error messages.

$DBPrefix

Table prefix


    protected
        string
    $DBPrefix
     = ''

$DSN

Data Source Name / Connect string


    protected
        string
    $DSN

$encrypt

Encryption flag/data


    protected
        mixed
    $encrypt
     = false

$failover

Settings for a failover connection.


    protected
        array<string|int, mixed>
    $failover
     = []

$hostname

Hostname


    protected
        string
    $hostname

$lastQuery

The last query object that was executed on this connection.


    protected
        mixed
    $lastQuery

$password

Password


    protected
        string
    $password

$pConnect

Persistent connection flag


    protected
        bool
    $pConnect
     = false

$port

Database port


    protected
        int|string
    $port
     = ''

$pretend

If true, no queries will actually be ran against the database.


    protected
        bool
    $pretend
     = false

$queryClass

Query Class


    protected
        string
    $queryClass
     = 'CodeIgniter\Database\Query'

$reservedIdentifiers

List of reserved identifiers


    protected
        array<string|int, mixed>
    $reservedIdentifiers
     = ['*']

Identifiers that must NOT be escaped.

$strictOn

Strict ON flag


    protected
        bool
    $strictOn

Whether we're running in strict SQL mode.

$subdriver

Sub-driver


    protected
        string
    $subdriver

$swapPre

Swap Prefix


    protected
        string
    $swapPre
     = ''

$transDepth

Transaction depth level


    protected
        int
    $transDepth
     = 0

$transFailure

Transaction failure flag


    protected
        bool
    $transFailure
     = false

Used with transactions to determine if a transaction has failed.

$transStatus

Transaction status flag


    protected
        bool
    $transStatus
     = true

Used with transactions to determine if a rollback should occur.

$username

Username


    protected
        string
    $username

__construct()

Saves our connection settings.


    public
                __construct(array<string|int, mixed> $params) : mixed

Parameters

$params : array<string|int, mixed>

Return values

mixed —

__get()

Accessor for properties if they exist.


    public
                __get(string $key) : mixed

Parameters

$key : string

Return values

mixed —

__isset()

Checker for properties existence.


    public
                __isset(string $key) : bool

Parameters

$key : string

Return values

bool —

_fieldData()

Returns an array of objects with field data


    public
                _fieldData(string $table) : array<string|int, stdClass>

Parameters

$table : string

Return values

array<string|int, stdClass> —

_foreignKeyData()

Returns an array of objects with Foreign key data


    public
                _foreignKeyData(string $table) : array<string|int, stdClass>

Parameters

$table : string

Return values

array<string|int, stdClass> —

_indexData()

Returns an array of objects with index data


    public
                _indexData(string $table) : array<string|int, stdClass>

Parameters

$table : string

Return values

array<string|int, stdClass> —

addTableAlias()

Add a table alias to our list.


    public
                addTableAlias(string $table) : $this

Parameters

$table : string

Return values

$this —

affectedRows()

Returns the total number of rows affected by this query.


    public
                affectedRows() : int

Return values

int —

callFunction()

This function enables you to call PHP database functions that are not natively included in CodeIgniter, in a platform independent manner.


    public
                callFunction(string $functionName, array<string|int, mixed> ...$params) : bool

Parameters

$functionName : string
$params : array<string|int, mixed>

Return values

bool —

close()

Close the database connection.


    public
                close() : void

Return values

void —

connect()

Connect to the database.


    public
                connect([bool $persistent = false ]) : mixed

Parameters

$persistent : bool = false

Return values

mixed —

disableForeignKeyChecks()

Disables foreign key checks temporarily.


    public
                disableForeignKeyChecks() : mixed

Return values

mixed —

enableForeignKeyChecks()

Enables foreign key checks temporarily.


    public
                enableForeignKeyChecks() : mixed

Return values

mixed —

error()

Returns the last error code and message.


    public
                error() : array<string, string|int>

Must return this format: ['code' => string|int, 'message' => string] intval(code) === 0 means "no error".

Return values

array<string, string|int> —

escape()

"Smart" Escape String


    public
                escape(mixed $str) : mixed

Escapes data based on type. Sets boolean and null types

Parameters

$str : mixed

Return values

mixed —

escapeIdentifiers()

Escape the SQL Identifiers


    public
                escapeIdentifiers(mixed $item) : mixed

This function escapes column and table names

Parameters

$item : mixed

Return values

mixed —

escapeLikeString()

Escape LIKE String


    public
                escapeLikeString(string|array<string|int, string> $str) : string|array<string|int, string>

Calls the individual driver for platform specific escaping for LIKE conditions

Parameters

$str : string|array<string|int, string>

Return values

string|array<string|int, string> —

escapeLikeStringDirect()

Escape Like String Direct There are a few instances where MySQLi queries cannot take the additional "ESCAPE x" parameter for specifying the escape character in "LIKE" strings, and this handles those directly with a backslash.


    public
                escapeLikeStringDirect(string|array<string|int, string> $str) : string|array<string|int, string>

Parameters

$str : string|array<string|int, string>: Input string

Return values

string|array<string|int, string> —

escapeString()

Escape String


    public
                escapeString(string|array<string|int, string> $str[, bool $like = false ]) : string|array<string|int, string>

Parameters

$str : string|array<string|int, string>: Input string
$like : bool = false: Whether or not the string will be used in a LIKE condition

Return values

string|array<string|int, string> —

execute()

Executes the query against the database.


    public
                execute(string $sql) : mixed

Parameters

$sql : string

Return values

mixed —

fieldExists()

Determine if a particular field exists


    public
                fieldExists(string $fieldName, string $tableName) : bool

Parameters

$fieldName : string
$tableName : string

Return values

bool —

getConnectDuration()

Returns the number of seconds with microseconds that it took to connect to the database.


    public
                getConnectDuration([int $decimals = 6 ]) : string

Used by the Debug Toolbar's timeline.

Parameters

$decimals : int = 6

Return values

string —

getConnection()

Returns the actual connection object. If both a 'read' and 'write' connection has been specified, you can pass either term in to get that connection. If you pass either alias in and only a single connection is present, it must return the sole connection.


    public
                getConnection([string|null $alias = null ]) : mixed

Parameters

$alias : string|null = null

Return values

mixed —

getConnectStart()

Returns the time we started to connect to this database in seconds with microseconds.


    public
                getConnectStart() : float|null

Used by the Debug Toolbar's timeline.

Return values

float|null —

getDatabase()

Returns the name of the current database being used.


    public
                getDatabase() : string

Return values

string —

getFieldData()

Returns an object with field data


    public
                getFieldData(string $table) : array<string|int, mixed>

Parameters

$table : string: the table name

Return values

array<string|int, mixed> —

getFieldNames()

Fetch Field Names


    public
                getFieldNames(string $table) : array<string|int, mixed>|false

Parameters

$table : string: Table name

Return values

array<string|int, mixed>|false —

getForeignKeyData()

Returns an object with foreign key data


    public
                getForeignKeyData(string $table) : array<string|int, mixed>

Parameters

$table : string: the table name

Return values

array<string|int, mixed> —

getIndexData()

Returns an object with key data


    public
                getIndexData(string $table) : array<string|int, mixed>

Parameters

$table : string: the table name

Return values

array<string|int, mixed> —

getLastQuery()

Returns the last query's statement object.


    public
                getLastQuery() : mixed

Return values

mixed —

getPlatform()

The name of the platform in use (MySQLi, mssql, etc)


    public
                getPlatform() : string

Return values

string —

getPrefix()

Returns the database prefix.


    public
                getPrefix() : string

Return values

string —

getVersion()

Returns a string containing the version of the database being used.


    public
                getVersion() : string

Return values

string —

initialize()

Initializes the database connection/settings.


    public
                initialize() : mixed|void

Return values

mixed|void —

insertID()

Insert ID


    public
                insertID() : int

Return values

int —

isWriteType()

Determines if the statement is a write-type query or not.


    public
                isWriteType(string $sql) : bool

Parameters

$sql : string

Return values

bool —

listTables()

Returns an array of table names


    public
                listTables([bool $constrainByPrefix = false ]) : bool|array<string|int, mixed>

Parameters

$constrainByPrefix : bool = false: = FALSE

Return values

bool|array<string|int, mixed> —

persistentConnect()

Create a persistent database connection.


    public
                persistentConnect() : mixed

Return values

mixed —

prefixTable()

Prepends a database prefix if one exists in configuration


    public
                prefixTable([string $table = '' ]) : string

Parameters

$table : string = '': the table

Return values

string —

prepare()

Creates a prepared statement with the database that can then be used to execute multiple statements against. Within the closure, you would build the query in any normal way, though the Query Builder is the expected manner.


    public
                prepare(Closure $func[, array<string|int, mixed> $options = [] ]) : BasePreparedQuery|null

Example: $stmt = $db->prepare(function($db) { return $db->table('users') ->where('id', 1) ->get(); })

Parameters

$func : Closure
$options : array<string|int, mixed> = []: Passed to the prepare() method

Return values

BasePreparedQuery|null —

pretend()

Allows the engine to be set into a mode where queries are not actually executed, but they are still generated, timed, etc.


    public
                pretend([bool $pretend = true ]) : $this

This is primarily used by the prepared query functionality.

Parameters

$pretend : bool = true

Return values

$this —

protectIdentifiers()

Protect Identifiers


    public
                protectIdentifiers(string|array<string|int, mixed> $item[, bool $prefixSingle = false ][, bool $protectIdentifiers = null ][, bool $fieldExists = true ]) : string|array<string|int, mixed>

This function is used extensively by the Query Builder class, and by a couple functions in this class. It takes a column or table name (optionally with an alias) and inserts the table prefix onto it. Some logic is necessary in order to deal with column names that include the path. Consider a query like this:

SELECT hostname.database.table.column AS c FROM hostname.database.table

Or a query with aliasing:

SELECT m.member_id, m.member_name FROM members AS m

Since the column name can include up to four segments (host, DB, table, column) or also have an alias prefix, we need to do a bit of work to figure this out and insert the table prefix (if it exists) in the proper position, and escape only the correct identifiers.

Parameters

$item : string|array<string|int, mixed>
$prefixSingle : bool = false
$protectIdentifiers : bool = null
$fieldExists : bool = true

Return values

string|array<string|int, mixed> —

query()

Orchestrates a query against the database. Queries must use Database\Statement objects to store the query and build it.


    public
                query(string $sql[, mixed $binds = null ][, bool $setEscapeFlags = true ][, string $queryClass = '' ]) : BaseResult|Query|bool

This method works with the cache.

Should automatically handle different connections for read/write queries if needed.

Parameters

$sql : string
$binds : mixed = null
$setEscapeFlags : bool = true
$queryClass : string = ''

Return values

BaseResult|Query|bool —

reconnect()

Keep or establish the connection if no queries have been sent for a length of time exceeding the server's idle timeout.


    public
                reconnect() : void

Return values

void —

resetDataCache()

Empties our data cache. Especially helpful during testing.


    public
                resetDataCache() : $this

Return values

$this —

setAliasedTables()

Sets the Table Aliases to use. These are typically collected during use of the Builder, and set here so queries are built correctly.


    public
                setAliasedTables(array<string|int, mixed> $aliases) : $this

Parameters

$aliases : array<string|int, mixed>

Return values

$this —

setDatabase()

Select a specific database table to use.


    public
                setDatabase(string $databaseName) : bool

Parameters

$databaseName : string

Return values

bool —

setPrefix()

Set DB Prefix


    public
                setPrefix([string $prefix = '' ]) : string

Set's the DB Prefix to something new without needing to reconnect

Parameters

$prefix : string = '': The prefix

Return values

string —

showLastQuery()

Returns a string representation of the last query's statement object.


    public
                showLastQuery() : string

Return values

string —

simpleQuery()

Performs a basic query against the database. No binding or caching is performed, nor are transactions handled. Simply takes a raw query string and returns the database-specific result id.


    public
                simpleQuery(string $sql) : mixed

Parameters

$sql : string

Return values

mixed —

table()

Returns an instance of the query builder for this connection.


    public
                table(string|array<string|int, mixed> $tableName) : BaseBuilder

Parameters

$tableName : string|array<string|int, mixed>

Return values

BaseBuilder —

tableExists()

Determine if a particular table exists


    public
                tableExists(string $tableName) : bool

Parameters

$tableName : string

Return values

bool —

transBegin()

Begin Transaction


    public
                transBegin([bool $testMode = false ]) : bool

Parameters

$testMode : bool = false

Return values

bool —

transCommit()

Commit Transaction


    public
                transCommit() : bool

Return values

bool —

transComplete()

Complete Transaction


    public
                transComplete() : bool

Return values

bool —

transOff()

Disable Transactions


    public
                transOff() : void

This permits transactions to be disabled at run-time.

Return values

void —

transRollback()

Rollback Transaction


    public
                transRollback() : bool

Return values

bool —

transStart()

Start Transaction


    public
                transStart([bool $testMode = false ]) : bool

Parameters

$testMode : bool = false: = FALSE

Return values

bool —

transStatus()

Lets you retrieve the transaction flag to determine if it has failed


    public
                transStatus() : bool

Return values

bool —

transStrict()

Enable/disable Transaction Strict Mode


    public
                transStrict([bool $mode = true ]) : $this

When strict mode is enabled, if you are running multiple groups of transactions, if one group fails all subsequent groups will be rolled back.

If strict mode is disabled, each group is treated autonomously, meaning a failure of one group will not affect any others

Parameters

$mode : bool = true: = true

Return values

$this —

_close()

Close the database connection.


    protected
                _close() : void

Return values

void —

_disableForeignKeyChecks()

Returns platform-specific SQL to disable foreign key checks.


    protected
                _disableForeignKeyChecks() : string

Return values

string —

_enableForeignKeyChecks()

Returns platform-specific SQL to enable foreign key checks.


    protected
                _enableForeignKeyChecks() : string

Return values

string —

_escapeString()

Platform-dependant string escape


    protected
                _escapeString(string $str) : string

Parameters

$str : string

Return values

string —

_listColumns()

Generates a platform-specific query string so that the column names can be fetched.


    protected
                _listColumns([string $table = '' ]) : string

Parameters

$table : string = ''

Return values

string —

_listTables()

Generates the SQL for listing tables in a platform-dependent manner.


    protected
                _listTables([bool $prefixLimit = false ]) : string

Uses escapeLikeStringDirect().

Parameters

$prefixLimit : bool = false

Return values

string —

_transBegin()

Begin Transaction


    protected
                _transBegin() : bool

Return values

bool —

_transCommit()

Commit Transaction


    protected
                _transCommit() : bool

Return values

bool —

_transRollback()

Rollback Transaction


    protected
                _transRollback() : bool

Return values

bool —

prepQuery()

Prep the query


    protected
                prepQuery(string $sql) : string

If needed, each database adapter can prep the query string

Parameters

$sql : string: an SQL query

Return values

string —

Connection extends BaseConnection in package Application

Table of Contents

Properties

$connID

$dataCache

$DBDriver

$deleteHack

$escapeChar

$likeEscapeChar

$likeEscapeStr

$mysqli

$protectIdentifiers

$resultID

$transEnabled

$transStrict

$aliasedTables

$charset

$compress

$connectDuration

$connectTime

$database

$DBCollat

$DBDebug

$DBPrefix

$DSN

$encrypt

$failover

$hostname

$lastQuery

$password

$pConnect

$port

$pretend

$queryClass

$reservedIdentifiers

$strictOn

$subdriver

Tags

$swapPre

$transDepth

$transFailure

$transStatus

$username

Methods

__construct()

Parameters

Return values

__get()

Parameters

Return values

__isset()

Parameters

Return values

_fieldData()

Parameters

Tags

Return values

_foreignKeyData()

Parameters

Tags

Return values

_indexData()

Parameters

Tags

Return values

addTableAlias()

Parameters

Return values

affectedRows()

Return values

callFunction()

Parameters

Tags

Return values

close()

Return values

connect()

Parameters

Tags

Return values

Connection extends BaseConnection
in package

Application