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<?php
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/**
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* This file contains the Command class.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2012 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db\dao;
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/**
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* QueryBuilder builds a SQL statement based on the specification given as a [[Query]] object.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class QueryBuilder extends \yii\base\Component
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{
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private $_connection;
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public function __construct($connection)
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{
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$this->_connection = $connection;
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}
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/**
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* @return CDbConnection the connection associated with this command
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*/
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public function getConnection()
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{
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return $this->_connection;
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}
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public function build($query)
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{
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$clauses = array(
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$this->buildSelect($query),
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$this->buildFrom($query),
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$this->buildJoin($query),
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$this->buildWhere($query),
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$this->buildGroupBy($query),
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$this->buildHaving($query),
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$this->buildUnion($query),
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$this->buildOrderBy($query),
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$this->buildLimit($query),
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);
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return implode("\n", array_filter($clauses));
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}
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/**
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* Builds a SQL statement for creating a new DB table.
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*
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* The columns in the new table should be specified as name-definition pairs (e.g. 'name'=>'string'),
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* where name stands for a column name which will be properly quoted by the method, and definition
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* stands for the column type which can contain an abstract DB type.
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* The {@link getColumnType} method will be invoked to convert any abstract type into a physical one.
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*
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* If a column is specified with definition only (e.g. 'PRIMARY KEY (name, type)'), it will be directly
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* inserted into the generated SQL.
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*
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* @param string $table the name of the table to be created. The name will be properly quoted by the method.
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* @param array $columns the columns (name=>definition) in the new table.
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* @param string $options additional SQL fragment that will be appended to the generated SQL.
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* @return string the SQL statement for creating a new DB table.
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*/
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public function createTable($table, $columns, $options = null)
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{
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$cols = array();
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foreach ($columns as $name => $type)
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{
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if (is_string($name))
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$cols[] = "\t" . $this->quoteColumnName($name) . ' ' . $this->getColumnType($type);
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else
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$cols[] = "\t" . $type;
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}
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$sql = "CREATE TABLE " . $this->quoteTableName($table) . " (\n" . implode(",\n", $cols) . "\n)";
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return $options === null ? $sql : $sql . ' ' . $options;
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}
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/**
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* Builds a SQL statement for renaming a DB table.
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* @param string $table the table to be renamed. The name will be properly quoted by the method.
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* @param string $newName the new table name. The name will be properly quoted by the method.
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* @return string the SQL statement for renaming a DB table.
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*/
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public function renameTable($table, $newName)
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{
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return 'RENAME TABLE ' . $this->quoteTableName($table) . ' TO ' . $this->quoteTableName($newName);
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}
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/**
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* Builds a SQL statement for dropping a DB table.
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* @param string $table the table to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a DB table.
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*/
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public function dropTable($table)
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{
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return "DROP TABLE " . $this->quoteTableName($table);
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}
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/**
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* Builds a SQL statement for truncating a DB table.
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* @param string $table the table to be truncated. The name will be properly quoted by the method.
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* @return string the SQL statement for truncating a DB table.
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*/
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public function truncateTable($table)
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{
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return "TRUNCATE TABLE " . $this->quoteTableName($table);
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}
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/**
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* Builds a SQL statement for adding a new DB column.
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* @param string $table the table that the new column will be added to. The table name will be properly quoted by the method.
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* @param string $column the name of the new column. The name will be properly quoted by the method.
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* @param string $type the column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
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* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
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* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
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* @return string the SQL statement for adding a new column.
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* @since 1.1.6
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*/
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public function addColumn($table, $column, $type)
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{
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return 'ALTER TABLE ' . $this->quoteTableName($table)
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. ' ADD ' . $this->quoteColumnName($column) . ' '
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. $this->getColumnType($type);
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}
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/**
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* Builds a SQL statement for dropping a DB column.
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* @param string $table the table whose column is to be dropped. The name will be properly quoted by the method.
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* @param string $column the name of the column to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a DB column.
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* @since 1.1.6
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*/
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public function dropColumn($table, $column)
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{
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return "ALTER TABLE " . $this->quoteTableName($table)
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. " DROP COLUMN " . $this->quoteColumnName($column);
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}
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/**
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* Builds a SQL statement for renaming a column.
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* @param string $table the table whose column is to be renamed. The name will be properly quoted by the method.
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* @param string $name the old name of the column. The name will be properly quoted by the method.
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* @param string $newName the new name of the column. The name will be properly quoted by the method.
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* @return string the SQL statement for renaming a DB column.
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* @since 1.1.6
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*/
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public function renameColumn($table, $name, $newName)
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{
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return "ALTER TABLE " . $this->quoteTableName($table)
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. " RENAME COLUMN " . $this->quoteColumnName($name)
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. " TO " . $this->quoteColumnName($newName);
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}
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/**
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* Builds a SQL statement for changing the definition of a column.
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* @param string $table the table whose column is to be changed. The table name will be properly quoted by the method.
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* @param string $column the name of the column to be changed. The name will be properly quoted by the method.
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* @param string $type the new column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
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* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
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* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
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* @return string the SQL statement for changing the definition of a column.
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*/
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public function alterColumn($table, $column, $type)
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{
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return 'ALTER TABLE ' . $this->quoteTableName($table) . ' CHANGE '
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. $this->quoteColumnName($column) . ' '
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. $this->quoteColumnName($column) . ' '
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. $this->getColumnType($type);
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}
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/**
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* Builds a SQL statement for adding a foreign key constraint to an existing table.
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* The method will properly quote the table and column names.
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* @param string $name the name of the foreign key constraint.
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* @param string $table the table that the foreign key constraint will be added to.
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* @param string $columns the name of the column to that the constraint will be added on. If there are multiple columns, separate them with commas.
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* @param string $refTable the table that the foreign key references to.
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* @param string $refColumns the name of the column that the foreign key references to. If there are multiple columns, separate them with commas.
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* @param string $delete the ON DELETE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
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* @param string $update the ON UPDATE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
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* @return string the SQL statement for adding a foreign key constraint to an existing table.
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*/
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public function addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete = null, $update = null)
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{
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$columns = preg_split('/\s*,\s*/', $columns, -1, PREG_SPLIT_NO_EMPTY);
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foreach ($columns as $i => $col)
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$columns[$i] = $this->quoteColumnName($col);
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$refColumns = preg_split('/\s*,\s*/', $refColumns, -1, PREG_SPLIT_NO_EMPTY);
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foreach ($refColumns as $i => $col)
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$refColumns[$i] = $this->quoteColumnName($col);
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$sql = 'ALTER TABLE ' . $this->quoteTableName($table)
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. ' ADD CONSTRAINT ' . $this->quoteColumnName($name)
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. ' FOREIGN KEY (' . implode(', ', $columns) . ')'
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. ' REFERENCES ' . $this->quoteTableName($refTable)
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. ' (' . implode(', ', $refColumns) . ')';
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if ($delete !== null)
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$sql .= ' ON DELETE ' . $delete;
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if ($update !== null)
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$sql .= ' ON UPDATE ' . $update;
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return $sql;
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}
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/**
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* Builds a SQL statement for dropping a foreign key constraint.
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* @param string $name the name of the foreign key constraint to be dropped. The name will be properly quoted by the method.
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* @param string $table the table whose foreign is to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a foreign key constraint.
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*/
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public function dropForeignKey($name, $table)
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{
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return 'ALTER TABLE ' . $this->quoteTableName($table)
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. ' DROP CONSTRAINT ' . $this->quoteColumnName($name);
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}
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/**
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* Builds a SQL statement for creating a new index.
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* @param string $name the name of the index. The name will be properly quoted by the method.
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* @param string $table the table that the new index will be created for. The table name will be properly quoted by the method.
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* @param string $column the column(s) that should be included in the index. If there are multiple columns, please separate them
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* by commas. Each column name will be properly quoted by the method, unless a parenthesis is found in the name.
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* @param boolean $unique whether to add UNIQUE constraint on the created index.
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* @return string the SQL statement for creating a new index.
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*/
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public function createIndex($name, $table, $column, $unique = false)
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{
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$cols = array();
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$columns = preg_split('/\s*,\s*/', $column, -1, PREG_SPLIT_NO_EMPTY);
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foreach ($columns as $col)
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{
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if (strpos($col, '(') !== false)
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$cols[] = $col;
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else
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$cols[] = $this->quoteColumnName($col);
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}
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return ($unique ? 'CREATE UNIQUE INDEX ' : 'CREATE INDEX ')
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. $this->quoteTableName($name) . ' ON '
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. $this->quoteTableName($table) . ' (' . implode(', ', $cols) . ')';
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}
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/**
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* Builds a SQL statement for dropping an index.
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* @param string $name the name of the index to be dropped. The name will be properly quoted by the method.
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* @param string $table the table whose index is to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping an index.
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*/
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public function dropIndex($name, $table)
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{
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return 'DROP INDEX ' . $this->quoteTableName($name) . ' ON ' . $this->quoteTableName($table);
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}
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protected function buildSelect($query)
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{
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$select = $query->distinct ? 'SELECT DISTINCT' : 'SELECT';
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$columns = $query->select;
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if (empty($columns)) {
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return $select . ' *';
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}
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if (is_string($columns)) {
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if (strpos($columns, '(') !== false) {
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return $select . ' ' . $columns;
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}
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$columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
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}
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foreach ($columns as $i => $column) {
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if (is_object($column)) {
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$columns[$i] = (string)$column;
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}
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elseif (strpos($column, '(') === false) {
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if (preg_match('/^(.*?)(?i:\s+as\s+|\s+)([\w\-\.])$/', $column, $matches)) {
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$columns[$i] = $this->_connection->quoteColumnName($matches[1]) . ' AS ' . $this->_connection->quoteSimpleColumnName($matches[2]);
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}
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else {
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$columns[$i] = $this->_connection->quoteColumnName($column);
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}
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}
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}
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return $select . ' ' . implode(', ', $columns);
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}
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protected function buildFrom($query)
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{
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$tables = $query->from;
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if (is_string($tables) && strpos($tables, '(') !== false) {
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return 'FROM ' . $tables;
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}
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if (!is_array($tables)) {
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$tables = preg_split('/\s*,\s*/', trim($tables), -1, PREG_SPLIT_NO_EMPTY);
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}
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foreach ($tables as $i => $table) {
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if (strpos($table, '(') === false) {
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if (preg_match('/^(.*?)(?i:\s+as\s+|\s+)(.*)$/i', $table, $matches)) { // with alias
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$tables[$i] = $this->_connection->quoteTableName($matches[1]) . ' ' . $this->_connection->quoteTableName($matches[2]);
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}
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else {
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$tables[$i] = $this->_connection->quoteTableName($table);
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}
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}
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}
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return 'FROM ' . implode(', ', $tables);
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}
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protected function buildJoin($query)
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{
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$joins = $query->join;
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if (empty($joins)) {
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return '';
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}
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if (is_string($joins)) {
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return $joins;
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}
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foreach ($joins as $i => $join) {
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if (is_array($join)) { // join type, table name, on-condition
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if (isset($join[0], $join[1])) {
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$table = $join[1];
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if (strpos($table,'(')===false) {
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if (preg_match('/^(.*?)(?i:\s+as\s+|\s+)(.*)$/', $table, $matches)) { // with alias
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$table = $this->_connection->quoteTableName($matches[1]).' '.$this->_connection->quoteTableName($matches[2]);
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}
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else {
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$table = $this->_connection->quoteTableName($table);
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}
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}
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$joins[$i] = strtoupper($join[0]) . ' ' . $table;
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if (isset($join[2])) { // join condition
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$condition = $this->processCondition($join[2]);
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$joins[$i] .= ' ON ' . $condition;
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|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
throw new Exception('The join clause may be specified as an array of at least two elements.');
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return implode("\n", $joins);
|
|
|
|
}
|
|
|
|
|
|
|
|
protected function buildWhere($query)
|
|
|
|
{
|
|
|
|
$where = $this->processConditions($query->where);
|
|
|
|
return empty($where) ? '' : 'WHERE ' . $where;
|
|
|
|
}
|
|
|
|
|
|
|
|
protected function buildGroupBy($query)
|
|
|
|
{
|
|
|
|
$columns = $query->groupBy;
|
|
|
|
if (empty($columns)) {
|
|
|
|
return '';
|
|
|
|
}
|
|
|
|
if (is_string($columns) && strpos($columns, '(') !== false) {
|
|
|
|
return 'GROUP BY ' . $columns;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!is_array($columns)) {
|
|
|
|
$columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
|
|
|
|
}
|
|
|
|
foreach ($columns as $i => $column) {
|
|
|
|
if (is_object($column)) {
|
|
|
|
$columns[$i] = (string)$column;
|
|
|
|
}
|
|
|
|
elseif (strpos($column, '(') === false) {
|
|
|
|
$columns[$i] = $this->_connection->quoteColumnName($column);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 'GROUP BY ' . implode(', ', $columns);
|
|
|
|
}
|
|
|
|
|
|
|
|
protected function buildHaving($query)
|
|
|
|
{
|
|
|
|
$having = $this->processConditions($query->having);
|
|
|
|
return empty($having) ? '' : 'HAVING ' . $having;
|
|
|
|
}
|
|
|
|
|
|
|
|
protected function buildOrderBy($query)
|
|
|
|
{
|
|
|
|
$columns = $query->orderBy;
|
|
|
|
if (empty($columns)) {
|
|
|
|
return '';
|
|
|
|
}
|
|
|
|
if (is_string($columns) && strpos($columns, '(') !== false) {
|
|
|
|
return 'ORDER BY ' . $columns;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!is_array($columns)) {
|
|
|
|
$columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
|
|
|
|
}
|
|
|
|
foreach ($columns as $i => $column) {
|
|
|
|
if (is_object($column)) {
|
|
|
|
$columns[$i] = (string)$column;
|
|
|
|
}
|
|
|
|
elseif (strpos($column, '(') === false) {
|
|
|
|
if (preg_match('/^(.*?)\s+(asc|desc)$/i', $column, $matches)) {
|
|
|
|
$columns[$i] = $this->_connection->quoteColumnName($matches[1]) . ' ' . strtoupper($matches[2]);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
$columns[$i] = $this->_connection->quoteColumnName($column);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 'ORDER BY ' . implode(', ', $columns);
|
|
|
|
}
|
|
|
|
|
|
|
|
protected function buildLimit($query)
|
|
|
|
{
|
|
|
|
$sql = '';
|
|
|
|
if ($query->limit !== null && $query->limit >= 0) {
|
|
|
|
$sql = 'LIMIT ' . (int)$query->limit;
|
|
|
|
}
|
|
|
|
if ($query->offset>0) {
|
|
|
|
$sql .= ' OFFSET '.(int)$query->offset;
|
|
|
|
}
|
|
|
|
return ltrim($sql);
|
|
|
|
}
|
|
|
|
|
|
|
|
protected function buildUnion($query)
|
|
|
|
{
|
|
|
|
$unions = $query->union;
|
|
|
|
if (empty($unions)) {
|
|
|
|
return '';
|
|
|
|
}
|
|
|
|
if (!is_array($unions)) {
|
|
|
|
$unions = array($unions);
|
|
|
|
}
|
|
|
|
foreach ($unions as $i => $union) {
|
|
|
|
if ($union instanceof Query) {
|
|
|
|
$unions[$i] = $union->getSql($this->_connection);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return "UNION (\n" . implode("\n) UNION (\n", $unions) . "\n)";
|
|
|
|
}
|
|
|
|
|
|
|
|
protected function processCondition($conditions)
|
|
|
|
{
|
|
|
|
if (!is_array($conditions)) {
|
|
|
|
return $conditions;
|
|
|
|
}
|
|
|
|
elseif ($conditions === array()) {
|
|
|
|
return '';
|
|
|
|
}
|
|
|
|
|
|
|
|
$n = count($conditions);
|
|
|
|
$operator = strtoupper($conditions[0]);
|
|
|
|
if ($operator === 'OR' || $operator === 'AND') {
|
|
|
|
$parts = array();
|
|
|
|
for ($i = 1; $i < $n; ++$i) {
|
|
|
|
$condition = $this->processCondition($conditions[$i]);
|
|
|
|
if ($condition !== '') {
|
|
|
|
$parts[] = '(' . $condition . ')';
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return $parts === array() ? '' : implode(' ' . $operator . ' ', $parts);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!isset($conditions[1], $conditions[2])) {
|
|
|
|
return '';
|
|
|
|
}
|
|
|
|
|
|
|
|
$column = $conditions[1];
|
|
|
|
if (strpos($column, '(') === false) {
|
|
|
|
$column = $this->_connection->quoteColumnName($column);
|
|
|
|
}
|
|
|
|
|
|
|
|
$values = $conditions[2];
|
|
|
|
if (!is_array($values)) {
|
|
|
|
$values = array($values);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ($operator === 'IN' || $operator === 'NOT IN') {
|
|
|
|
if ($values === array()) {
|
|
|
|
return $operator === 'IN' ? '0=1' : '';
|
|
|
|
}
|
|
|
|
foreach ($values as $i => $value) {
|
|
|
|
if (is_string($value)) {
|
|
|
|
$values[$i] = $this->_connection->quoteValue($value);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
$values[$i] = (string)$value;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return $column . ' ' . $operator . ' (' . implode(', ', $values) . ')';
|
|
|
|
}
|
|
|
|
|
|
|
|
if ($operator === 'LIKE' || $operator === 'NOT LIKE' || $operator === 'OR LIKE' || $operator === 'OR NOT LIKE') {
|
|
|
|
if ($values === array()) {
|
|
|
|
return $operator === 'LIKE' || $operator === 'OR LIKE' ? '0=1' : '';
|
|
|
|
}
|
|
|
|
|
|
|
|
if ($operator === 'LIKE' || $operator === 'NOT LIKE') {
|
|
|
|
$andor = ' AND ';
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
$andor = ' OR ';
|
|
|
|
$operator = $operator === 'OR LIKE' ? 'LIKE' : 'NOT LIKE';
|
|
|
|
}
|
|
|
|
$expressions = array();
|
|
|
|
foreach ($values as $value) {
|
|
|
|
$expressions[] = $column . ' ' . $operator . ' ' . $this->_connection->quoteValue($value);
|
|
|
|
}
|
|
|
|
return implode($andor, $expressions);
|
|
|
|
}
|
|
|
|
|
|
|
|
throw new Exception('Unknown operator: ' . $operator);
|
|
|
|
}
|
|
|
|
}
|