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## PostgresQuery extends Query

PostgresQuery.php : 25

Postgres driver for DataTables Database Query class

@internal

### Table of Contents

$_field_quote : mixed
$_identifier_limiter : mixed
$_supportsAsAlias : mixed
$_whereInCnt : mixed
__construct() : mixed
  Query instance constructor.
and_where() : mixed
  Add addition where conditions to the query with an AND operator. An alias of `where` for naming consistency.
bind() : Query
  Safely bind an input value to a parameter. This is evaluated when the query is executed. This allows user input to be safely executed without risk of an SQL injection attack.
commit() : mixed
  Commit a transaction.
connect() : mixed
  Database connection - override by the database driver.
database() : DataTable
  Get the Database host for this query instance
distinct() : Query
  Set a distinct flag for a `select` query. Note that this has no effect on any of the other query types.
dsnPostfix() : Query
  Common helper for the drivers to handle a PDO DSN postfix
exec() : Result
  Execute the query.
get() : self
  Get fields.
group_by() : self
  Group the results by the values in a field
join() : mixed
  Perform a JOIN operation
limit() : self
  Limit the result set to a certain size.
offset() : self
  Offset the return set by a given number of records (useful for paging).
or_where() : mixed
  Add addition where conditions to the query with an OR operator.
order() : self
  Order by
pkey() : Query|array<string|int, string>
  Get / set the primary key column name(s) so they can be easily returned after an insert.
rollback() : mixed
  Rollback the database state to the start of the transaction.
set() : mixed
  Set fields to a given value.
table() : self
  Set table(s) to perform the query on.
transaction() : mixed
  Start a database transaction
where() : mixed
  Where query - multiple conditions are bound as ANDs.
where_group() : mixed
  Provide grouping for WHERE conditions. Use it with a callback function to automatically group any conditions applied inside the method.
where_in() : mixed
  Provide a method that can be used to perform a `WHERE ... IN (...)` query with bound values and parameters.
_build_limit() : string
  Create the LIMIT / OFFSET string
_exec() : mixed
_prepare() : void
  Prepare the SQL query by populating the bound variables.

### Properties

#### $_field_quote

PostgresQuery.php : 33
`protected mixed $_field_quote = '"'`

#### $_identifier_limiter

PostgresQuery.php : 31
`protected mixed $_identifier_limiter = array('"', '"')`

#### $_supportsAsAlias

Query.php : 155
`protected mixed $_supportsAsAlias = true`

#### $_whereInCnt

Query.php : 157
`protected mixed $_whereInCnt = 1`

### Methods

#### __construct()

Query.php : 53

Query instance constructor.

`public __construct(mixed $dbHost, mixed $type[, mixed $table = null ]) : mixed`

Note that typically instances of this class will be automatically created through the \DataTables\Database->query() method.

##### Parameters

$dbHost : mixed
$type : mixed
$table : mixed = null

##### Return values

mixed —

#### and_where()

Query.php : 614

Add addition where conditions to the query with an AND operator. An alias of `where` for naming consistency.

`public and_where(string|array<string|int, string>|callable $key[, mixed $value = null ][, mixed $op = "=" ][, mixed $bind = true ]) : mixed`

Can be used in two different ways, as where( field, value ) or as an array of conditions to use: where( array('fieldName', ...), array('value', ...) );

##### Parameters

$key : string|array<string|int, string>|callable

  Single field name, or an array of field names. If given as a function (i.e. a closure), the function is called, passing the query itself in as the only parameter, so the function can add extra conditions with parentheses around the additional parameters. @param string|string[] $value Single field value, or an array of values. Can be null to search for `IS NULL` or `IS NOT NULL` (depending on the value of `$op` which should be `=` or `!=`. @param string $op Condition operator: <, >, = etc @param boolean $bind Escape the value (true, default) or not (false). @return self

$value : mixed = null
$op : mixed = "="
$bind : mixed = true

##### Return values

mixed —

#### bind()

Query.php : 242

Safely bind an input value to a parameter. This is evaluated when the query is executed. This allows user input to be safely executed without risk of an SQL injection attack.

`public bind(string $name, string $value[, mixed $type = null ]) : Query`

##### Parameters

$name : string

  Parameter name. This should include a leading colon

$value : string

  Value to bind

$type : mixed = null

  Data type. See the PHP PDO documentation: http://php.net/manual/en/pdo.constants.php

##### Return values

Query —

#### commit()

Query.php : 169

Commit a transaction.

`public static commit(mixed $dbh) : mixed`

@param \PDO $dbh The Database handle (typically a PDO object, but not always).

##### Parameters

$dbh : mixed

##### Return values

mixed —

#### connect()

PostgresQuery.php : 39

Database connection - override by the database driver.

`public static connect(mixed $user[, mixed $pass = '' ][, mixed $host = '' ][, mixed $port = '' ][, mixed $db = '' ][, mixed $dsn = '' ]) : mixed`

@param string|array $user User name or all parameters in an array

##### Parameters

$user : mixed
$pass : mixed = ''

  Password @param string $host Host name @param string $db Database name @return Query

$host : mixed = ''
$port : mixed = ''
$db : mixed = ''
$dsn : mixed = ''

##### Return values

mixed —

#### database()

Query.php : 258

Get the Database host for this query instance

`public database() : DataTable`

##### Return values

DataTable —

Database class instance

#### distinct()

Query.php : 270

Set a distinct flag for a `select` query. Note that this has no effect on any of the other query types.

`public distinct(mixed $dis) : Query`

@param boolean $dis Optional

##### Parameters

$dis : mixed

##### Return values

Query —

#### dsnPostfix()

Query.php : 211

Common helper for the drivers to handle a PDO DSN postfix

`public static dsnPostfix(mixed $dsn) : Query`

@param string $dsn DSN postfix to use

##### Parameters

$dsn : mixed

##### Return values

Query —

@internal

#### exec()

Query.php : 282

Execute the query.

`public exec([mixed $sql = null ]) : Result`

@param string $sql SQL string to execute (only if _type is 'raw').

##### Parameters

$sql : mixed = null

##### Return values

Result —

#### get()

Query.php : 315

Get fields.

`public get(mixed $get) : self`

@param string|string[] $get,... Fields to get - can be specified as individual fields or an array of fields.

##### Parameters

$get : mixed

##### Return values

self —

#### group_by()

Query.php : 399

Group the results by the values in a field

`public group_by(mixed $group_by) : self`

##### Parameters

$group_by : mixed

##### Return values

self —

#### join()

Query.php : 356

Perform a JOIN operation

`public join(mixed $table, string $condition[, mixed $type = '' ][, mixed $bind = true ]) : mixed`

@param string $table Table name to do the JOIN on

##### Parameters

$table : mixed
$condition : string

  JOIN condition @param string $type JOIN type @return self

$type : mixed = ''
$bind : mixed = true

##### Return values

mixed —

#### limit()

Query.php : 387

Limit the result set to a certain size.

`public limit(mixed $lim) : self`

@param int $lim The number of records to limit the result to.

##### Parameters

$lim : mixed

##### Return values

self —

#### offset()

Query.php : 462

Offset the return set by a given number of records (useful for paging).

`public offset(mixed $off) : self`

@param int $off The number of records to offset the result by.

##### Parameters

$off : mixed

##### Return values

self —

#### or_where()

Query.php : 636

Add addition where conditions to the query with an OR operator.

`public or_where(string|array<string|int, string>|callable $key[, mixed $value = null ][, mixed $op = "=" ][, mixed $bind = true ]) : mixed`

Can be used in two different ways, as where( field, value ) or as an array of conditions to use: where( array('fieldName', ...), array('value', ...) );

##### Parameters

$key : string|array<string|int, string>|callable

  Single field name, or an array of field names. If given as a function (i.e. a closure), the function is called, passing the query itself in as the only parameter, so the function can add extra conditions with parentheses around the additional parameters. @param string|string[] $value Single field value, or an array of values. Can be null to search for `IS NULL` or `IS NOT NULL` (depending on the value of `$op` which should be `=` or `!=`. @param string $op Condition operator: <, >, = etc @param boolean $bind Escape the value (true, default) or not (false). @return self

$value : mixed = null
$op : mixed = "="
$bind : mixed = true

##### Return values

mixed —

#### order()

Query.php : 477

Order by

`public order(mixed $order) : self`

@param string|string[] $order Columns and direction to order by - can be specified as individual names, an array of names, a string of comma separated names or any combination of those.

##### Parameters

$order : mixed

##### Return values

self —

#### pkey()

Query.php : 413

Get / set the primary key column name(s) so they can be easily returned after an insert.

`public pkey([array<string|int, string> $pkey = null ]) : Query|array<string|int, string>`

##### Parameters

$pkey : array<string|int, string> = null

  Primary keys

##### Return values

Query|array<string|int, string> —

#### rollback()

Query.php : 199

Rollback the database state to the start of the transaction.

`public static rollback(mixed $dbh) : mixed`

@param \PDO $dbh The Database handle (typically a PDO object, but not always).

##### Parameters

$dbh : mixed

##### Return values

mixed —

#### set()

Query.php : 520

Set fields to a given value.

`public set(string|array<string|int, string> $set[, mixed $val = null ][, mixed $bind = true ]) : mixed`

Can be used in two different ways, as set( field, value ) or as an array of fields to set: set( array( 'fieldName' => 'value', ...) );

##### Parameters

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

  Can be given as a single string, when then $val must be set, or as an array of key/value pairs to be set. @param string $val When $set is given as a simple string, $set is the field name and this is the field's value. @param boolean $bind Should the value be bound or not @return self

$val : mixed = null
$bind : mixed = true

##### Return values

mixed —

#### table()

Query.php : 432

Set table(s) to perform the query on.

`public table(mixed $table) : self`

@param string|string[] $table,... Table(s) to use - can be specified as individual names, an array of names, a string of comma separated names or any combination of those.

##### Parameters

$table : mixed

##### Return values

self —

#### transaction()

Query.php : 189

Start a database transaction

`public static transaction(mixed $dbh) : mixed`

@param \PDO $dbh The Database handle (typically a PDO object, but not always).

##### Parameters

$dbh : mixed

##### Return values

mixed —

#### where()

Query.php : 574

Where query - multiple conditions are bound as ANDs.

`public where(string|array<string|int, string>|callable $key[, mixed $value = null ][, mixed $op = "=" ][, mixed $bind = true ]) : mixed`

Can be used in two different ways, as where( field, value ) or as an array of conditions to use: where( array('fieldName', ...), array('value', ...) );

##### Parameters

$key : string|array<string|int, string>|callable

  Single field name, or an array of field names. If given as a function (i.e. a closure), the function is called, passing the query itself in as the only parameter, so the function can add extra conditions with parentheses around the additional parameters. @param string|string[] $value Single field value, or an array of values. Can be null to search for `IS NULL` or `IS NOT NULL` (depending on the value of `$op` which should be `=` or `!=`. @param string $op Condition operator: <, >, = etc @param boolean $bind Escape the value (true, default) or not (false). @return self

  @example The following will produce `'WHERE name='allan' AND ( location='Scotland' OR location='Canada' )`:

        $query
          ->where( 'name', 'allan' )
          ->where( function ($q) {
            $q->where( 'location', 'Scotland' );
            $q->or_where( 'location', 'Canada' );
          } );

$value : mixed = null
$op : mixed = "="
$bind : mixed = true

##### Return values

mixed —

#### where_group()

Query.php : 684

Provide grouping for WHERE conditions. Use it with a callback function to automatically group any conditions applied inside the method.

`public where_group(bool|callable $inOut[, mixed $op = 'AND' ]) : mixed`

For legacy reasons this method also provides the ability to explicitly define if a grouping bracket should be opened or closed in the query. This method is not prefer.

##### Parameters

$inOut : bool|callable

  If callable it will create the group automatically and pass the query into the called function. For legacy operations use `true` to open brackets, `false` to close. @param string $op Conditional operator to use to join to the preceding condition. Default `AND`. @return self

  @example

      $query->where_group( function ($q) {
        $q->where( 'location', 'Edinburgh' );
        $q->where( 'position', 'Manager' );
      } );

$op : mixed = 'AND'

##### Return values

mixed —

#### where_in()

Query.php : 712

Provide a method that can be used to perform a `WHERE ... IN (...)` query with bound values and parameters.

`public where_in(mixed $field, mixed $arr[, mixed $operator = "AND" ]) : mixed`

Note this is only suitable for local values, not a sub-query. For that use `->where()` with an unbound value.

##### Parameters

$field : mixed
$arr : mixed
$operator : mixed = "AND"

##### Return values

mixed —

#### _build_limit()

Query.php : 806

Create the LIMIT / OFFSET string

`protected _build_limit() : string`

MySQL and Postgres style - anything else can have the driver override

##### Return values

string —

@internal

#### _exec()

PostgresQuery.php : 131
`protected _exec() : mixed`

##### Return values

mixed —

#### _prepare()

PostgresQuery.php : 84

Prepare the SQL query by populating the bound variables.

`protected _prepare(mixed $sql) : void`

Provided by the driver

##### Parameters

$sql : mixed

##### Return values

void —

@internal

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