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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
*/
namespace yii\db\sqlite;
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use yii\db\TableSchema;
use yii\db\ColumnSchema;
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/**
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* Schema is the class for retrieving metadata from a SQLite (2/3) database.
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*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class Schema extends \yii\db\Schema
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{
/**
* @var array mapping from physical column types (keys) to abstract column types (values)
*/
public $typeMap = [
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'tinyint' => self::TYPE_SMALLINT,
'bit' => self::TYPE_SMALLINT,
'smallint' => self::TYPE_SMALLINT,
'mediumint' => self::TYPE_INTEGER,
'int' => self::TYPE_INTEGER,
'integer' => self::TYPE_INTEGER,
'bigint' => self::TYPE_BIGINT,
'float' => self::TYPE_FLOAT,
'double' => self::TYPE_FLOAT,
'real' => self::TYPE_FLOAT,
'decimal' => self::TYPE_DECIMAL,
'numeric' => self::TYPE_DECIMAL,
'tinytext' => self::TYPE_TEXT,
'mediumtext' => self::TYPE_TEXT,
'longtext' => self::TYPE_TEXT,
'text' => self::TYPE_TEXT,
'varchar' => self::TYPE_STRING,
'string' => self::TYPE_STRING,
'char' => self::TYPE_STRING,
'datetime' => self::TYPE_DATETIME,
'year' => self::TYPE_DATE,
'date' => self::TYPE_DATE,
'time' => self::TYPE_TIME,
'timestamp' => self::TYPE_TIMESTAMP,
'enum' => self::TYPE_STRING,
];
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/**
* Quotes a table name for use in a query.
* A simple table name has no schema prefix.
* @param string $name table name
* @return string the properly quoted table name
*/
public function quoteSimpleTableName($name)
{
return strpos($name, "`") !== false ? $name : "`" . $name . "`";
}
/**
* Quotes a column name for use in a query.
* A simple column name has no prefix.
* @param string $name column name
* @return string the properly quoted column name
*/
public function quoteSimpleColumnName($name)
{
return strpos($name, '`') !== false || $name === '*' ? $name : '`' . $name . '`';
}
/**
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* Creates a query builder for the MySQL database.
* This method may be overridden by child classes to create a DBMS-specific query builder.
* @return QueryBuilder query builder instance
*/
public function createQueryBuilder()
{
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return new QueryBuilder($this->db);
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}
/**
* Returns all table names in the database.
* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
* If not empty, the returned table names will be prefixed with the schema name.
* @return array all table names in the database.
*/
protected function findTableNames($schema = '')
{
$sql = "SELECT DISTINCT tbl_name FROM sqlite_master WHERE tbl_name<>'sqlite_sequence'";
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return $this->db->createCommand($sql)->queryColumn();
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}
/**
* Loads the metadata for the specified table.
* @param string $name table name
* @return TableSchema driver dependent table metadata. Null if the table does not exist.
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*/
protected function loadTableSchema($name)
{
$table = new TableSchema;
$table->name = $name;
if ($this->findColumns($table)) {
$this->findConstraints($table);
return $table;
} else {
return null;
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}
}
/**
* Collects the table column metadata.
* @param TableSchema $table the table metadata
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* @return boolean whether the table exists in the database
*/
protected function findColumns($table)
{
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$sql = "PRAGMA table_info(" . $this->quoteSimpleTableName($table->name) . ')';
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$columns = $this->db->createCommand($sql)->queryAll();
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if (empty($columns)) {
return false;
}
foreach ($columns as $info) {
$column = $this->loadColumnSchema($info);
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$table->columns[$column->name] = $column;
if ($column->isPrimaryKey) {
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$table->primaryKey[] = $column->name;
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}
}
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if (count($table->primaryKey) === 1 && !strncasecmp($table->columns[$table->primaryKey[0]]->dbType, 'int', 3)) {
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$table->sequenceName = '';
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$table->columns[$table->primaryKey[0]]->autoIncrement = true;
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}
return true;
}
/**
* Collects the foreign key column details for the given table.
* @param TableSchema $table the table metadata
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*/
protected function findConstraints($table)
{
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$sql = "PRAGMA foreign_key_list(" . $this->quoteSimpleTableName($table->name) . ')';
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$keys = $this->db->createCommand($sql)->queryAll();
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foreach ($keys as $key) {
$id = (int)$key['id'];
if (!isset($table->foreignKeys[$id])) {
$table->foreignKeys[$id] = [$key['table'], $key['from'] => $key['to']];
} else {
// composite FK
$table->foreignKeys[$id][$key['from']] = $key['to'];
}
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}
}
/**
* Loads the column information into a [[ColumnSchema]] object.
* @param array $info column information
* @return ColumnSchema the column schema object
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*/
protected function loadColumnSchema($info)
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{
$column = new ColumnSchema;
$column->name = $info['name'];
$column->allowNull = !$info['notnull'];
$column->isPrimaryKey = $info['pk'] != 0;
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$column->dbType = $info['type'];
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$column->unsigned = strpos($column->dbType, 'unsigned') !== false;
$column->type = self::TYPE_STRING;
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if (preg_match('/^(\w+)(?:\(([^\)]+)\))?/', $column->dbType, $matches)) {
$type = strtolower($matches[1]);
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if (isset($this->typeMap[$type])) {
$column->type = $this->typeMap[$type];
}
if (!empty($matches[2])) {
$values = explode(',', $matches[2]);
$column->size = $column->precision = (int)$values[0];
if (isset($values[1])) {
$column->scale = (int)$values[1];
}
if ($column->size === 1 && ($type === 'tinyint' || $type === 'bit')) {
$column->type = 'boolean';
} elseif ($type === 'bit') {
if ($column->size > 32) {
$column->type = 'bigint';
} elseif ($column->size === 32) {
$column->type = 'integer';
}
}
}
}
$column->phpType = $this->getColumnPhpType($column);
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$value = $info['dflt_value'];
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if ($column->type === 'string') {
$column->defaultValue = trim($value, "'\"");
} else {
$column->defaultValue = $column->typecast(strcasecmp($value, 'null') ? $value : null);
}
return $column;
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}
}