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WIP MySQL Server for SQLite #272

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WIP MySQL Server for SQLite #272

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76a739a
Fix usage of fully qualified table names
JanJakes Oct 16, 2025
35211d7
Enable read usage of information schema tables in write queries
JanJakes Oct 17, 2025
c0f28cc
Implement column metadata for SHOW, EXPLAIN/DESCRIBE, ANALYZE, CHECK,…
JanJakes Oct 17, 2025
01a0126
Unify database user name to "root"
JanJakes Oct 20, 2025
38a6a35
Add MySQL protocol implementation from https://github.com/adamziel/my…
JanJakes Oct 20, 2025
90c045f
Use WordPress coding styles
JanJakes Oct 20, 2025
aaa498e
Remove unused and Playground-specific code
JanJakes Oct 20, 2025
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102 changes: 102 additions & 0 deletions packages/wp-mysql-proxy/src/handler-sqlite-translation.php
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<?php

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Class file names should be based on the class name with "class-" prepended. Expected class-sqlitetranslationhandler.php, but found handler-sqlite-translation.php.

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Class file names should be based on the class name with "class-" prepended. Expected class-sqlitetranslationhandler.php, but found handler-sqlite-translation.php.

define( 'WP_DEBUG', false );

require_once __DIR__ . '/../../../version.php';
require_once __DIR__ . '/../../../wp-includes/parser/class-wp-parser-grammar.php';
require_once __DIR__ . '/../../../wp-includes/parser/class-wp-parser.php';
require_once __DIR__ . '/../../../wp-includes/parser/class-wp-parser-node.php';
require_once __DIR__ . '/../../../wp-includes/parser/class-wp-parser-token.php';
require_once __DIR__ . '/../../../wp-includes/mysql/class-wp-mysql-token.php';
require_once __DIR__ . '/../../../wp-includes/mysql/class-wp-mysql-lexer.php';
require_once __DIR__ . '/../../../wp-includes/mysql/class-wp-mysql-parser.php';
require_once __DIR__ . '/../../../wp-includes/sqlite/class-wp-sqlite-pdo-user-defined-functions.php';
require_once __DIR__ . '/../../../wp-includes/sqlite-ast/class-wp-sqlite-connection.php';
require_once __DIR__ . '/../../../wp-includes/sqlite-ast/class-wp-sqlite-configurator.php';
require_once __DIR__ . '/../../../wp-includes/sqlite-ast/class-wp-sqlite-driver.php';
require_once __DIR__ . '/../../../wp-includes/sqlite-ast/class-wp-sqlite-driver-exception.php';
require_once __DIR__ . '/../../../wp-includes/sqlite-ast/class-wp-sqlite-information-schema-builder.php';
require_once __DIR__ . '/../../../wp-includes/sqlite-ast/class-wp-sqlite-information-schema-exception.php';
require_once __DIR__ . '/../../../wp-includes/sqlite-ast/class-wp-sqlite-information-schema-reconstructor.php';

class SQLiteTranslationHandler implements MySQLQueryHandler {
/** @var WP_SQLite_Driver */
private $sqlite_driver;

public function __construct( $sqlite_database_path ) {
define( 'FQDB', $sqlite_database_path );
define( 'FQDBDIR', dirname( FQDB ) . '/' );

$this->sqlite_driver = new WP_SQLite_Driver(
new WP_SQLite_Connection( array( 'path' => $sqlite_database_path ) ),
'sqlite_database'
);
}

public function handle_query( string $query ): MySQLServerQueryResult {
try {
$rows = $this->sqlite_driver->query( $query );
if ( $this->sqlite_driver->get_last_column_count() > 0 ) {
$columns = $this->computeColumnInfo();
return new SelectQueryResult( $columns, $rows );
}
return new OkayPacketResult(
$this->sqlite_driver->get_last_return_value() ?? 0,
$this->sqlite_driver->get_insert_id() ?? 0
);
} catch ( Throwable $e ) {
return new ErrorQueryResult( $e->getMessage() );
}
}

public function computeColumnInfo() {
$columns = array();

$column_meta = $this->sqlite_driver->get_last_column_meta();

$types = array(
'DECIMAL' => MySQLProtocol::FIELD_TYPE_DECIMAL,
'TINY' => MySQLProtocol::FIELD_TYPE_TINY,
'SHORT' => MySQLProtocol::FIELD_TYPE_SHORT,
'LONG' => MySQLProtocol::FIELD_TYPE_LONG,
'FLOAT' => MySQLProtocol::FIELD_TYPE_FLOAT,
'DOUBLE' => MySQLProtocol::FIELD_TYPE_DOUBLE,
'NULL' => MySQLProtocol::FIELD_TYPE_NULL,
'TIMESTAMP' => MySQLProtocol::FIELD_TYPE_TIMESTAMP,
'LONGLONG' => MySQLProtocol::FIELD_TYPE_LONGLONG,
'INT24' => MySQLProtocol::FIELD_TYPE_INT24,
'DATE' => MySQLProtocol::FIELD_TYPE_DATE,
'TIME' => MySQLProtocol::FIELD_TYPE_TIME,
'DATETIME' => MySQLProtocol::FIELD_TYPE_DATETIME,
'YEAR' => MySQLProtocol::FIELD_TYPE_YEAR,
'NEWDATE' => MySQLProtocol::FIELD_TYPE_NEWDATE,
'VARCHAR' => MySQLProtocol::FIELD_TYPE_VARCHAR,
'BIT' => MySQLProtocol::FIELD_TYPE_BIT,
'NEWDECIMAL' => MySQLProtocol::FIELD_TYPE_NEWDECIMAL,
'ENUM' => MySQLProtocol::FIELD_TYPE_ENUM,
'SET' => MySQLProtocol::FIELD_TYPE_SET,
'TINY_BLOB' => MySQLProtocol::FIELD_TYPE_TINY_BLOB,
'MEDIUM_BLOB' => MySQLProtocol::FIELD_TYPE_MEDIUM_BLOB,
'LONG_BLOB' => MySQLProtocol::FIELD_TYPE_LONG_BLOB,
'BLOB' => MySQLProtocol::FIELD_TYPE_BLOB,
'VAR_STRING' => MySQLProtocol::FIELD_TYPE_VAR_STRING,
'STRING' => MySQLProtocol::FIELD_TYPE_STRING,
'GEOMETRY' => MySQLProtocol::FIELD_TYPE_GEOMETRY,
);

foreach ( $column_meta as $column ) {
$type = $types[ $column['native_type'] ] ?? null;
if ( null === $type ) {
throw new Exception( 'Unknown column type: ' . $column['native_type'] );
}
$columns[] = array(
'name' => $column['name'],
'length' => $column['len'],
'type' => $type,
'flags' => 129,
'decimals' => $column['precision'],
);
}
return $columns;
}
}
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