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<?php

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namespace Yoast\WP\Lib\Migrations;

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use Exception;

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/**

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* Yoast migrations table class.

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class Table {

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/**

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* The adapter.

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* @var Adapter

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private $adapter;

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/**

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* The name

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* @var string

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private $name;

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/**

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* The options

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* @var array

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private $options;

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/**

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* The SQL representation of this table.

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* @var string

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private $sql = '';

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/**

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* Whether or not the table has been initialized.

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* @var bool

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private $initialized = false;

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/**

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* The columns

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* @var Column[]

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private $columns = [];

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/**

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* The primary keys.

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* @var string[]

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private $primary_keys = [];

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/**

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* Whether or not to auto generate the id.

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* @var bool

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private $auto_generate_id = true;

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/**

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* Creates an instance of the Adapter.

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* @param Adapter $adapter The current adapter.

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* @param string $name The table name.

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* @param array $options The options.

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* @throws Exception If invalid arguments are passed.

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public function __construct( $adapter, $name, $options = [] ) {

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// Sanity checks.

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if ( ! $adapter instanceof Adapter ) {

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throw new Exception( 'Invalid MySQL Adapter instance.' );

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}

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if ( ! $name ) {

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throw new Exception( "Invalid 'name' parameter" );

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}

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$this->adapter = $adapter;

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$this->name = $name;

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$this->options = $options;

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$this->init_sql( $name, $options );

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if ( \array_key_exists( 'id', $options ) ) {

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if ( \is_bool( $options['id'] ) && $options['id'] === false ) {

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$this->auto_generate_id = false;

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}

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// If its a string then we want to auto-generate an integer-based

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// primary key with this name.

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if ( \is_string( $options['id'] ) ) {

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$this->auto_generate_id = true;

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$this->primary_keys[] = $options['id'];

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}

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}

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}

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/**

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* Create a column

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* @param string $column_name The column name.

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* @param string $type The column type.

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* @param array $options The options.

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* @return void

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public function column( $column_name, $type, $options = [] ) {

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// If there is already a column by the same name then silently fail and continue.

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foreach ( $this->columns as $column ) {

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if ( $column->name === $column_name ) {

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return;

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}

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}

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$column_options = [];

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if ( \array_key_exists( 'primary_key', $options ) ) {

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if ( $options['primary_key'] ) {

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$this->primary_keys[] = $column_name;

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}

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}

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if ( \array_key_exists( 'auto_increment', $options ) ) {

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if ( $options['auto_increment'] ) {

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$column_options['auto_increment'] = true;

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}

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}

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$column_options = \array_merge( $column_options, $options );

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$column = new Column( $this->adapter, $column_name, $type, $column_options );

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$this->columns[] = $column;

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}

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/**

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* Shortcut to create timestamps columns (default created_at, updated_at)

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* @param string $created_column_name Created at column name.

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* @param string $updated_column_name Updated at column name.

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* @return void

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public function timestamps( $created_column_name = 'created_at', $updated_column_name = 'updated_at' ) {

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$this->column( $created_column_name, 'datetime' );

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$this->column(

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$updated_column_name,

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'timestamp',

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[

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'null' => false,

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'default' => 'CURRENT_TIMESTAMP',

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'extra' => 'ON UPDATE CURRENT_TIMESTAMP',

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]

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);

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}

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/**

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* Get all primary keys

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* @return string

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private function keys() {

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if ( \count( $this->primary_keys ) > 0 ) {

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$lead = ' PRIMARY KEY (';

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$quoted = [];

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foreach ( $this->primary_keys as $key ) {

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$quoted[] = \sprintf( '%s', $this->adapter->identifier( $key ) );

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}

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$primary_key_sql = ",\n" . $lead . \implode( ',', $quoted ) . ')';

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return $primary_key_sql;

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}

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return '';

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}

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/**

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* Table definition

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* @param bool $wants_sql Whether or not to return SQL or execute the query. Defaults to false.

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* @return bool|string

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* @throws Exception If the table definition has not been intialized.

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public function finish( $wants_sql = false ) {

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if ( ! $this->initialized ) {

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throw new Exception( \sprintf( "Table Definition: '%s' has not been initialized", $this->name ) );

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}

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$opt_str = '';

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if ( \is_array( $this->options ) && \array_key_exists( 'options', $this->options ) ) {

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$opt_str = $this->options['options'];

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}

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elseif ( isset( $this->adapter->db_info['charset'] ) ) {

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$opt_str = ' DEFAULT CHARSET=' . $this->adapter->db_info['charset'];

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}

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else {

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$opt_str = ' DEFAULT CHARSET=utf8';

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}

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$close_sql = \sprintf( ') %s;', $opt_str );

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$create_table_sql = $this->sql;

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if ( $this->auto_generate_id === true ) {

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$this->primary_keys[] = 'id';

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$primary_id = new Column(

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$this->adapter,

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'id',

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'integer',

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[

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'unsigned' => true,

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'null' => false,

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'auto_increment' => true,

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]

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);

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$create_table_sql .= $primary_id->to_sql() . ",\n";

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}

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$create_table_sql .= $this->columns_to_str();

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$create_table_sql .= $this->keys() . $close_sql;

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if ( $wants_sql ) {

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return $create_table_sql;

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}

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return $this->adapter->execute_ddl( $create_table_sql );

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}

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/**

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* Get SQL for all columns.

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* @return string The SQL.

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private function columns_to_str() {

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$fields = [];

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$len = \count( $this->columns );

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for ( $i = 0; $i < $len; $i++ ) {

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$c = $this->columns[ $i ];

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$fields[] = $c->__toString();

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}

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return \implode( ",\n", $fields );

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}

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/**

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* Init create sql statement.

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* @param string $name The name.

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* @param array $options The options.

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* @return void

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private function init_sql( $name, $options ) {

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// Are we forcing table creation? If so, drop it first.

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if ( \array_key_exists( 'force', $options ) && $options['force'] === true ) {

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$this->adapter->drop_table( $name );

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}

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$temp = '';

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if ( \array_key_exists( 'temporary', $options ) ) {

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$temp = ' TEMPORARY';

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}

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$create_sql = \sprintf( 'CREATE%s TABLE ', $temp );

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$create_sql .= \sprintf( "%s (\n", $this->adapter->identifier( $name ) );

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$this->sql .= $create_sql;

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$this->initialized = true;

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}

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}

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