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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\sqlite;
use yii\db\Exception;
use yii\base\InvalidParamException;
use yii\base\NotSupportedException;
/**
* QueryBuilder is the query builder for SQLite databases.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class QueryBuilder extends \yii\db\QueryBuilder
{
/**
* @var array mapping from abstract column types (keys) to physical column types (values).
*/
public $typeMap = [
Schema::TYPE_PK => 'integer PRIMARY KEY AUTOINCREMENT NOT NULL',
Schema::TYPE_BIGPK => 'integer PRIMARY KEY AUTOINCREMENT NOT NULL',
Schema::TYPE_STRING => 'varchar(255)',
Schema::TYPE_TEXT => 'text',
Schema::TYPE_SMALLINT => 'smallint',
Schema::TYPE_INTEGER => 'integer',
Schema::TYPE_BIGINT => 'bigint',
Schema::TYPE_FLOAT => 'float',
Schema::TYPE_DECIMAL => 'decimal(10,0)',
Schema::TYPE_DATETIME => 'datetime',
Schema::TYPE_TIMESTAMP => 'timestamp',
Schema::TYPE_TIME => 'time',
Schema::TYPE_DATE => 'date',
Schema::TYPE_BINARY => 'blob',
Schema::TYPE_BOOLEAN => 'boolean',
Schema::TYPE_MONEY => 'decimal(19,4)',
];
/**
* Generates a batch INSERT SQL statement.
* For example,
*
* ~~~
* $connection->createCommand()->batchInsert('user', ['name', 'age'], [
* ['Tom', 30],
* ['Jane', 20],
* ['Linda', 25],
* ])->execute();
* ~~~
*
* Note that the values in each row must match the corresponding column names.
*
* @param string $table the table that new rows will be inserted into.
* @param array $columns the column names
* @param array $rows the rows to be batch inserted into the table
* @return string the batch INSERT SQL statement
*/
public function batchInsert($table, $columns, $rows)
{
if (($tableSchema = $this->db->getTableSchema($table)) !== null) {
$columnSchemas = $tableSchema->columns;
} else {
$columnSchemas = [];
}
$values = [];
foreach ($rows as $row) {
$vs = [];
foreach ($row as $i => $value) {
if (!is_array($value) && isset($columnSchemas[$columns[$i]])) {
$value = $columnSchemas[$columns[$i]]->typecast($value);
}
if (is_string($value)) {
$value = $this->db->quoteValue($value);
} elseif ($value === false) {
$value = 0;
} elseif ($value === null) {
$value = 'NULL';
}
$vs[] = $value;
}
$values[] = implode(', ', $vs);
}
foreach ($columns as $i => $name) {
$columns[$i] = $this->db->quoteColumnName($name);
}
return 'INSERT INTO ' . $this->db->quoteTableName($table)
. ' (' . implode(', ', $columns) . ') SELECT ' . implode(' UNION SELECT ', $values);
}
/**
* Creates a SQL statement for resetting the sequence value of a table's primary key.
* The sequence will be reset such that the primary key of the next new row inserted
* will have the specified value or 1.
* @param string $tableName the name of the table whose primary key sequence will be reset
* @param mixed $value the value for the primary key of the next new row inserted. If this is not set,
* the next new row's primary key will have a value 1.
* @return string the SQL statement for resetting sequence
* @throws InvalidParamException if the table does not exist or there is no sequence associated with the table.
*/
public function resetSequence($tableName, $value = null)
{
$db = $this->db;
$table = $db->getTableSchema($tableName);
if ($table !== null && $table->sequenceName !== null) {
if ($value === null) {
$key = reset($table->primaryKey);
$tableName = $db->quoteTableName($tableName);
$value = $db->createCommand("SELECT MAX('$key') FROM $tableName")->queryScalar();
} else {
$value = (int) $value - 1;
}
try {
$db->createCommand("UPDATE sqlite_sequence SET seq='$value' WHERE name='{$table->name}'")->execute();
} catch (Exception $e) {
// it's possible that sqlite_sequence does not exist
}
} elseif ($table === null) {
throw new InvalidParamException("Table not found: $tableName");
} else {
throw new InvalidParamException("There is not sequence associated with table '$tableName'.'");
}
}
/**
* Enables or disables integrity check.
* @param boolean $check whether to turn on or off the integrity check.
* @param string $schema the schema of the tables. Meaningless for SQLite.
* @param string $table the table name. Meaningless for SQLite.
* @return string the SQL statement for checking integrity
* @throws NotSupportedException this is not supported by SQLite
*/
public function checkIntegrity($check = true, $schema = '', $table = '')
{
return 'PRAGMA foreign_keys='.(int)$check;
}
/**
* Builds a SQL statement for truncating a DB table.
* @param string $table the table to be truncated. The name will be properly quoted by the method.
* @return string the SQL statement for truncating a DB table.
*/
public function truncateTable($table)
{
return "DELETE FROM " . $this->db->quoteTableName($table);
}
/**
* Builds a SQL statement for dropping an index.
* @param string $name the name of the index to be dropped. The name will be properly quoted by the method.
* @param string $table the table whose index is to be dropped. The name will be properly quoted by the method.
* @return string the SQL statement for dropping an index.
*/
public function dropIndex($name, $table)
{
return 'DROP INDEX ' . $this->db->quoteTableName($name);
}
/**
* Builds a SQL statement for dropping a DB column.
* @param string $table the table whose column is to be dropped. The name will be properly quoted by the method.
* @param string $column the name of the column to be dropped. The name will be properly quoted by the method.
* @return string the SQL statement for dropping a DB column.
* @throws NotSupportedException this is not supported by SQLite
*/
public function dropColumn($table, $column)
{
throw new NotSupportedException(__METHOD__ . ' is not supported by SQLite.');
}
/**
* Builds a SQL statement for renaming a column.
* @param string $table the table whose column is to be renamed. The name will be properly quoted by the method.
* @param string $oldName the old name of the column. The name will be properly quoted by the method.
* @param string $newName the new name of the column. The name will be properly quoted by the method.
* @return string the SQL statement for renaming a DB column.
* @throws NotSupportedException this is not supported by SQLite
*/
public function renameColumn($table, $oldName, $newName)
{
throw new NotSupportedException(__METHOD__ . ' is not supported by SQLite.');
}
/**
* Builds a SQL statement for adding a foreign key constraint to an existing table.
* The method will properly quote the table and column names.
* @param string $name the name of the foreign key constraint.
* @param string $table the table that the foreign key constraint will be added to.
* @param string|array $columns the name of the column to that the constraint will be added on.
* If there are multiple columns, separate them with commas or use an array to represent them.
* @param string $refTable the table that the foreign key references to.
* @param string|array $refColumns the name of the column that the foreign key references to.
* If there are multiple columns, separate them with commas or use an array to represent them.
* @param string $delete the ON DELETE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
* @param string $update the ON UPDATE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
* @return string the SQL statement for adding a foreign key constraint to an existing table.
* @throws NotSupportedException this is not supported by SQLite
*/
public function addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete = null, $update = null)
{
throw new NotSupportedException(__METHOD__ . ' is not supported by SQLite.');
}
/**
* Builds a SQL statement for dropping a foreign key constraint.
* @param string $name the name of the foreign key constraint to be dropped. The name will be properly quoted by the method.
* @param string $table the table whose foreign is to be dropped. The name will be properly quoted by the method.
* @return string the SQL statement for dropping a foreign key constraint.
* @throws NotSupportedException this is not supported by SQLite
*/
public function dropForeignKey($name, $table)
{
throw new NotSupportedException(__METHOD__ . ' is not supported by SQLite.');
}
/**
* Builds a SQL statement for changing the definition of a column.
* @param string $table the table whose column is to be changed. The table name will be properly quoted by the method.
* @param string $column the name of the column to be changed. The name will be properly quoted by the method.
* @param string $type the new column type. The [[getColumnType()]] method will be invoked to convert abstract
* column type (if any) into the physical one. Anything that is not recognized as abstract type will be kept
* in the generated SQL. For example, 'string' will be turned into 'varchar(255)', while 'string not null'
* will become 'varchar(255) not null'.
* @return string the SQL statement for changing the definition of a column.
* @throws NotSupportedException this is not supported by SQLite
*/
public function alterColumn($table, $column, $type)
{
throw new NotSupportedException(__METHOD__ . ' is not supported by SQLite.');
}
/**
* Builds a SQL statement for adding a primary key constraint to an existing table.
* @param string $name the name of the primary key constraint.
* @param string $table the table that the primary key constraint will be added to.
* @param string|array $columns comma separated string or array of columns that the primary key will consist of.
* @return string the SQL statement for adding a primary key constraint to an existing table.
* @throws NotSupportedException this is not supported by SQLite
*/
public function addPrimaryKey($name, $table, $columns)
{
throw new NotSupportedException(__METHOD__ . ' is not supported by SQLite.');
}
/**
* Builds a SQL statement for removing a primary key constraint to an existing table.
* @param string $name the name of the primary key constraint to be removed.
* @param string $table the table that the primary key constraint will be removed from.
* @return string the SQL statement for removing a primary key constraint from an existing table.
* @throws NotSupportedException this is not supported by SQLite
*/
public function dropPrimaryKey($name, $table)
{
throw new NotSupportedException(__METHOD__ . ' is not supported by SQLite.');
}
/**
* @inheritdoc
*/
public function buildLimit($limit, $offset)
{
$sql = '';
if ($this->hasLimit($limit)) {
$sql = 'LIMIT ' . $limit;
if ($this->hasOffset($offset)) {
$sql .= ' OFFSET ' . $offset;
}
} elseif ($this->hasOffset($offset)) {
// limit is not optional in SQLite
// http://www.sqlite.org/syntaxdiagrams.html#select-stmt
$sql = "LIMIT 9223372036854775807 OFFSET $offset"; // 2^63-1
}
return $sql;
}
}