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<?php
/*
* $Id$
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.doctrine-project.org>.
*/
/**
* Doctrine_Expression_Driver
*
* @package Doctrine
* @subpackage Expression
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link www.doctrine-project.org
* @since 1.0
* @version $Revision$
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
*/
class Doctrine_Expression_Driver extends Doctrine_Connection_Module
{
public function getIdentifier($column)
{
return $column;
}
public function getIdentifiers($columns)
{
return $columns;
}
/**
* regexp
* returns the regular expression operator
*
* @return string
*/
public function regexp()
{
throw new Doctrine_Expression_Exception('Regular expression operator is not supported by this database driver.');
}
/**
* Returns the average value of a column
*
* @param string $column the column to use
* @return string generated sql including an AVG aggregate function
*/
public function avg($column)
{
$column = $this->getIdentifier($column);
return 'AVG(' . $column . ')';
}
/**
* Returns the number of rows (without a NULL value) of a column
*
* If a '*' is used instead of a column the number of selected rows
* is returned.
*
* @param string|integer $column the column to use
* @return string generated sql including a COUNT aggregate function
*/
public function count($column)
{
$column = $this->getIdentifier($column);
return 'COUNT(' . $column . ')';
}
/**
* Returns the highest value of a column
*
* @param string $column the column to use
* @return string generated sql including a MAX aggregate function
*/
public function max($column)
{
$column = $this->getIdentifier($column);
return 'MAX(' . $column . ')';
}
/**
* Returns the lowest value of a column
*
* @param string $column the column to use
* @return string
*/
public function min($column)
{
$column = $this->getIdentifier($column);
return 'MIN(' . $column . ')';
}
/**
* Returns the total sum of a column
*
* @param string $column the column to use
* @return string
*/
public function sum($column)
{
$column = $this->getIdentifier($column);
return 'SUM(' . $column . ')';
}
// scalar functions
/**
* Returns the md5 sum of a field.
*
* Note: Not SQL92, but common functionality
*
* @return string
*/
public function md5($column)
{
$column = $this->getIdentifier($column);
return 'MD5(' . $column . ')';
}
/**
* Returns the length of a text field.
*
* @param string $expression1
* @param string $expression2
* @return string
*/
public function length($column)
{
$column = $this->getIdentifier($column);
return 'LENGTH(' . $column . ')';
}
/**
* Rounds a numeric field to the number of decimals specified.
*
* @param string $expression1
* @param string $expression2
* @return string
*/
public function round($column, $decimals = 0)
{
$column = $this->getIdentifier($column);
return 'ROUND(' . $column . ', ' . $decimals . ')';
}
/**
* Returns the remainder of the division operation
* $expression1 / $expression2.
*
* @param string $expression1
* @param string $expression2
* @return string
*/
public function mod($expression1, $expression2)
{
$expression1 = $this->getIdentifier($expression1);
$expression2 = $this->getIdentifier($expression2);
return 'MOD(' . $expression1 . ', ' . $expression2 . ')';
}
/**
* trim
* returns the string $str with leading and proceeding space characters removed
*
* @param string $str literal string or column name
* @return string
*/
public function trim($str)
{
return 'TRIM(' . $str . ')';
}
/**
* rtrim
* returns the string $str with proceeding space characters removed
*
* @param string $str literal string or column name
* @return string
*/
public function rtrim($str)
{
return 'RTRIM(' . $str . ')';
}
/**
* ltrim
* returns the string $str with leading space characters removed
*
* @param string $str literal string or column name
* @return string
*/
public function ltrim($str)
{
return 'LTRIM(' . $str . ')';
}
/**
* upper
* Returns the string $str with all characters changed to
* uppercase according to the current character set mapping.
*
* @param string $str literal string or column name
* @return string
*/
public function upper($str)
{
return 'UPPER(' . $str . ')';
}
/**
* lower
* Returns the string $str with all characters changed to
* lowercase according to the current character set mapping.
*
* @param string $str literal string or column name
* @return string
*/
public function lower($str)
{
return 'LOWER(' . $str . ')';
}
/**
* locate
* returns the position of the first occurrence of substring $substr in string $str
*
* @param string $substr literal string to find
* @param string $str literal string
* @return integer
*/
public function locate($str, $substr)
{
return 'LOCATE(' . $str . ', ' . $substr . ')';
}
/**
* Returns the current system date.
*
* @return string
*/
public function now()
{
return 'NOW()';
}
/**
* soundex
* Returns a string to call a function to compute the
* soundex encoding of a string
*
* The string "?000" is returned if the argument is NULL.
*
* @param string $value
* @return string SQL soundex function with given parameter
*/
public function soundex($value)
{
throw new Doctrine_Expression_Exception('SQL soundex function not supported by this driver.');
}
/**
* return string to call a function to get a substring inside an SQL statement
*
* Note: Not SQL92, but common functionality.
*
* SQLite only supports the 2 parameter variant of this function
*
* @param string $value an sql string literal or column name/alias
* @param integer $position where to start the substring portion
* @param integer $length the substring portion length
* @return string SQL substring function with given parameters
*/
public function substring($value, $from, $len = null)
{
$value = $this->getIdentifier($value);
if ($len === null)
return 'SUBSTRING(' . $value . ' FROM ' . $from . ')';
else {
$len = $this->getIdentifier($len);
return 'SUBSTRING(' . $value . ' FROM ' . $from . ' FOR ' . $len . ')';
}
}
/**
* Returns a series of strings concatinated
*
* concat() accepts an arbitrary number of parameters. Each parameter
* must contain an expression or an array with expressions.
*
* @param string|array(string) strings that will be concatinated.
*/
public function concat()
{
$args = func_get_args();
return 'CONCAT(' . join(', ', (array) $args) . ')';
}
/**
* Returns the SQL for a logical not.
*
* @return string a logical expression
*/
public function not($expression)
{
$expression = $this->getIdentifier($expression);
return 'NOT(' . $expression . ')';
}
/**
* Returns the SQL to perform the same mathematical operation over an array
* of values or expressions.
*
* basicMath() accepts an arbitrary number of parameters. Each parameter
* must contain a value or an expression or an array with values or
* expressions.
*
* @param string $type the type of operation, can be '+', '-', '*' or '/'.
* @param string|array(string)
* @return string an expression
*/
private function basicMath($type, array $args)
{
$elements = $this->getIdentifiers($args);
if (count($elements) < 1) {
return '';
}
if (count($elements) == 1) {
return $elements[0];
} else {
return '(' . implode(' ' . $type . ' ', $elements) . ')';
}
}
/**
* Returns the SQL to add values or expressions together.
*
* add() accepts an arbitrary number of parameters. Each parameter
* must contain a value or an expression or an array with values or
* expressions.
*
* @param string|array(string)
* @return string an expression
*/
public function add(array $args)
{
return $this->basicMath('+', $args);
}
/**
* Returns the SQL to subtract values or expressions from eachother.
*
* subtract() accepts an arbitrary number of parameters. Each parameter
* must contain a value or an expression or an array with values or
* expressions.
*
* @param string|array(string)
* @return string an expression
*/
public function sub(array $args)
{
return $this->basicMath('-', $args );
}
/**
* Returns the SQL to multiply values or expressions by eachother.
*
* multiply() accepts an arbitrary number of parameters. Each parameter
* must contain a value or an expression or an array with values or
* expressions.
*
* @param string|array(string)
* @return string an expression
*/
public function mul(array $args)
{
return $this->basicMath('*', $args);
}
/**
* Returns the SQL to divide values or expressions by eachother.
*
* divide() accepts an arbitrary number of parameters. Each parameter
* must contain a value or an expression or an array with values or
* expressions.
*
* @param string|array(string)
* @return string an expression
*/
public function div(array $args)
{
return $this->basicMath('/', $args);
}
/**
* Returns the SQL to check if two values are equal.
*
* @param string $value1 logical expression to compare
* @param string $value2 logical expression to compare with
* @return string logical expression
*/
public function eq($value1, $value2)
{
$value1 = $this->getIdentifier($value1);
$value2 = $this->getIdentifier($value2);
return $value1 . ' = ' . $value2;
}
/**
* Returns the SQL to check if two values are unequal.
*
* @param string $value1 logical expression to compare
* @param string $value2 logical expression to compare with
* @return string logical expression
*/
public function neq($value1, $value2)
{
$value1 = $this->getIdentifier($value1);
$value2 = $this->getIdentifier($value2);
return $value1 . ' <> ' . $value2;
}
/**
* Returns the SQL to check if one value is greater than another value.
*
* @param string $value1 logical expression to compare
* @param string $value2 logical expression to compare with
* @return string logical expression
*/
public function gt($value1, $value2)
{
$value1 = $this->getIdentifier($value1);
$value2 = $this->getIdentifier($value2);
return $value1 . ' > ' . $value2;
}
/**
* Returns the SQL to check if one value is greater than or equal to
* another value.
*
* @param string $value1 logical expression to compare
* @param string $value2 logical expression to compare with
* @return string logical expression
*/
public function gte($value1, $value2)
{
$value1 = $this->getIdentifier($value1);
$value2 = $this->getIdentifier($value2);
return $value1 . ' >= ' . $value2;
}
/**
* Returns the SQL to check if one value is less than another value.
*
* @param string $value1 logical expression to compare
* @param string $value2 logical expression to compare with
* @return string logical expression
*/
public function lt($value1, $value2)
{
$value1 = $this->getIdentifier($value1);
$value2 = $this->getIdentifier($value2);
return $value1 . ' < ' . $value2;
}
/**
* Returns the SQL to check if one value is less than or equal to
* another value.
*
* @param string $value1 logical expression to compare
* @param string $value2 logical expression to compare with
* @return string logical expression
*/
public function lte($value1, $value2)
{
$value1 = $this->getIdentifier($value1);
$value2 = $this->getIdentifier($value2);
return $value1 . ' <= ' . $value2;
}
/**
* Returns the SQL to check if a value is one in a set of
* given values..
*
* in() accepts an arbitrary number of parameters. The first parameter
* must always specify the value that should be matched against. Successive
* must contain a logical expression or an array with logical expressions.
* These expressions will be matched against the first parameter.
*
* @param string $column the value that should be matched against
* @param string|array(string) values that will be matched against $column
* @return string logical expression
*/
public function in($column, $values)
{
if ( ! is_array($values)) {
$values = array($values);
}
$values = $this->getIdentifiers($values);
$column = $this->getIdentifier($column);
if (count($values) == 0) {
throw new Doctrine_Expression_Exception('Values array for IN operator should not be empty.');
}
return $column . ' IN (' . implode(', ', $values) . ')';
}
/**
* Returns SQL that checks if a expression is null.
*
* @param string $expression the expression that should be compared to null
* @return string logical expression
*/
public function isNull($expression)
{
$expression = $this->getIdentifier($expression);
return $expression . ' IS NULL';
}
/**
* Returns SQL that checks if a expression is not null.
*
* @param string $expression the expression that should be compared to null
* @return string logical expression
*/
public function isNotNull($expression)
{
$expression = $this->getIdentifier($expression);
return $expression . ' IS NOT NULL';
}
/**
* Returns SQL that checks if an expression evaluates to a value between
* two values.
*
* The parameter $expression is checked if it is between $value1 and $value2.
*
* Note: There is a slight difference in the way BETWEEN works on some databases.
* http://www.w3schools.com/sql/sql_between.asp. If you want complete database
* independence you should avoid using between().
*
* @param string $expression the value to compare to
* @param string $value1 the lower value to compare with
* @param string $value2 the higher value to compare with
* @return string logical expression
*/
public function between($expression, $value1, $value2)
{
$expression = $this->getIdentifier($expression);
$value1 = $this->getIdentifier($value1);
$value2 = $this->getIdentifier($value2);
return $expression . ' BETWEEN ' .$value1 . ' AND ' . $value2;
}
/**
* Returns global unique identifier
*
* @return string to get global unique identifier
*/
public function guid()
{
throw new Doctrine_Expression_Exception('method not implemented');
}
/**
* returns arcus cosine SQL string
*
* @return string
*/
public function acos($value)
{
return 'ACOS(' . $value . ')';
}
/**
* sin
*
* @param string $value
* @return void
*/
public function sin($value)
{
return 'SIN(' . $value . ')';
}
/**
* pi
*
* @return void
*/
public function pi()
{
return 'PI()';
}
/**
* cos
*
* @param string $value
* @return void
*/
public function cos($value)
{
return 'COS(' . $value . ')';
}
/**
* coalesce
*
* @return string
*/
public function coalesce()
{
$args = func_get_args();
return 'COALESCE(' . join(', ', (array) $args) . ')';
}
/**
* __call
*
* for all native RDBMS functions the function name itself is returned
*/
public function __call($m, $a)
{
if ($this->conn->getAttribute(Doctrine_Core::ATTR_PORTABILITY) & Doctrine_Core::PORTABILITY_EXPR) {
throw new Doctrine_Expression_Exception('Unknown expression: ' . $m);
}
return $m . '(' . implode(', ', $a) . ')';
}
}
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