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Description

Add a JOIN source to the query. Internal method.

The join_operator should be one of INNER, LEFT OUTER, CROSS etc – this will be prepended to JOIN. The table should be the name of the table to join to. The constraint may be either a string or an array with three elements. If it is a string, it will be compiled into the query as-is, with no escaping. The recommended way to supply the constraint is as an array with three elements: first_column, operator, second_column Example: array('user.id', '=', 'profile.user_id') will compile to ON user`.`id = profile`.`user_id The final (optional) argument specifies an alias for the joined table.

Usage

$ORM = ORM::add_join_source( $join_operator, $table, $constraint, $table_alias );

Parameters

$join_operator

( string ) required – The join_operator should be one of INNER, LEFT OUTER, CROSS etc – this will be prepended to JOIN.

$table

( string ) required – The table should be the name of the table to join to.

$constraint

( string ) required – The constraint.

$table_alias

( string|null ) optional – The alias for the joined table. Defaults to null.

Returns

ORM

Source

File name: wordpress-seo/lib/orm.php
Lines:

  protected function add_join_source( $join_operator, $table, $constraint, $table_alias = null ) {
    $join_operator = \trim( "{$join_operator} JOIN" );
    $table         = $this->quote_identifier( $table );
    // Add table alias if present.
    if ( ! \is_null( $table_alias ) ) {
      $table_alias = $this->quote_identifier( $table_alias );
      $table      .= " {$table_alias}";
    }
    // Build the constraint.
    if ( \is_array( $constraint ) ) {
      list( $first_column, $operator, $second_column ) = $constraint;

      $first_column  = $this->quote_identifier( $first_column );
      $second_column = $this->quote_identifier( $second_column );
      $constraint    = "{$first_column} {$operator} {$second_column}";
    }
    $this->_join_sources[] = "{$join_operator} {$table} ON {$constraint}";

    return $this;
  }
 

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