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tags/2.0.0-alpha
Qiang Xue 13 years ago
parent
c26c9396b0
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a00afed163
2 changed files with 143 additions and 54 deletions
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  1. 19
      framework/db/dao/Query.php
  2. 178
      framework/db/dao/QueryBuilder.php

19
framework/db/dao/Query.php
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@ -163,9 +163,22 @@ class Query extends \yii\base\Object
* specifying the values to be bound to the query.
*
* The $condition parameter should be either a string (e.g. 'id=1') or an array.
* If the latter, it must be in the format of `array(operator, operand1, operand2, ...)`,
* where the operator can be one of the followings, and the possible operands depend on the corresponding
* operator:
* If the latter, it must be in one of the following two formats:
*
* - hash format: `array('column1' => value1, 'column2' => value2, ...)`
* - operator format: `array(operator, operand1, operand2, ...)`
*
* A condition in hash format represents the following SQL expression in general:
* `column1=value1 AND column2=value2 AND ...`. In case when a value is an array,
* an `IN` expression will be generated. And if a value is null, `IS NULL` will be used
* in the generated expression. Below are some examples:
*
* - `array('type'=>1, 'status'=>2)` generates `(type=1) AND (status=2)`.
* - `array('id'=>array(1,2,3), 'status'=>2)` generates `(id IN (1,2,3)) AND (status=2)`.
* - `array('status'=>null) generates `status IS NULL`.
*
* A condition in operator format generates the SQL expression according to the specified operator, which
* can be one of the followings:
*
* - `and`: the operands should be concatenated together using `AND`. For example,
* `array('and', 'id=1', 'id=2')` will generate `id=1 AND id=2`. If an operand is an array,

178
framework/db/dao/QueryBuilder.php
Unescape View File

@ -476,87 +476,163 @@ class QueryBuilder extends \yii\base\Object
}
/**
* Generates a SQL condition from the given PHP representation.
* @param string|array $condition the PHP representation of the SQL condition
* @return string the generated SQL condition.
* Parses the condition specification and generates the corresponding SQL expression.
* @param string|array $condition the condition specification. Please refer to [[Query::where()]]
* on how to specify a condition.
* @return string the generated SQL expression
* @throws \yii\db\Exception if the condition is in bad format
*/
public function buildCondition($condition)
{
static $builders = array(
'and' => 'buildAndCondition',
'or' => 'buildAndCondition',
'between' => 'buildBetweenCondition',
'not between' => 'buildBetweenCondition',
'in' => 'buildInCondition',
'not in' => 'buildInCondition',
'like' => 'buildLikeCondition',
'not like' => 'buildLikeCondition',
'or like' => 'buildLikeCondition',
'or not like' => 'buildLikeCondition',
);
if (!is_array($condition)) {
return $condition;
} elseif ($condition === array()) {
return '';
}
if (isset($condition[0])) { // operator format: operator, operand 1, operand 2, ...
$operator = $condition[0];
if (isset($builders[$operator])) {
$method = $builders[$operator];
array_shift($condition);
return $this->$method($operator, $condition);
} else {
throw new Exception('Found unknown operator in query: ' . $operator);
}
} else { // hash format: 'column1'=>'value1', 'column2'=>'value2', ...
return $this->buildHashCondition($condition);
}
}
$n = count($condition);
$operator = strtoupper($condition[0]);
if ($operator === 'OR' || $operator === 'AND') {
$parts = array();
for ($i = 1; $i < $n; ++$i) {
$part = $this->buildCondition($condition[$i]);
if ($part !== '') {
$parts[] = '(' . $part . ')';
private function buildHashCondition($condition)
{
$parts = array();
foreach ($condition as $column => $value) {
if (is_array($value)) { // IN condition
$parts[] = $this->buildInCondition('in', array($column, $value));
} else {
if (strpos($column, '(') === false) {
$column = $this->quoteColumnName($column);
}
if ($value === null) {
$parts[] = "$column IS NULL";
} elseif (is_string($value)) {
$parts[] = "$column=" . $this->connection->quoteValue($value);
} else {
$parts[] = "$column=$value";
}
}
return $parts === array() ? '' : implode(' ' . $operator . ' ', $parts);
}
return '(' . implode(') AND (', $parts) . ')';
}
if (!isset($condition[1], $condition[2])) {
throw new Exception("Operator $operator requires at least two operands.");
private function buildAndCondition($operator, $operands)
{
$parts = array();
foreach ($operands as $operand) {
if (is_array($operand)) {
$operand = $this->buildCondition($operand);
}
if ($operand !== '') {
$parts[] = $operand;
}
}
if ($parts !== array()) {
return '(' . implode(") $operator (", $parts) . ')';
} else {
return '';
}
}
private function buildBetweenCondition($operator, $operands)
{
if (!isset($operands[0], $operands[1], $operands[2])) {
throw new Exception("Operator '$operator' requires three operands.");
}
list($column, $value1, $value2) = $operands;
$column = $condition[1];
if (strpos($column, '(') === false) {
$column = $this->quoteColumnName($column);
}
$value1 = is_string($value1) ? $this->connection->quoteValue($value1) : (string)$value1;
$value2 = is_string($value2) ? $this->connection->quoteValue($value2) : (string)$value2;
if ($operator === 'BETWEEN' || $operator === 'NOT BETWEEN') {
if (!isset($condition[3])) {
throw new Exception("Operator $operator requires three operands.");
}
$value1 = is_string($condition[2]) ? $this->connection->quoteValue($condition[2]) : (string)$condition[2];
$value2 = is_string($condition[3]) ? $this->connection->quoteValue($condition[3]) : (string)$condition[3];
return "$column $operator $value1 AND $value2";
return "$column $operator $value1 AND $value2";
}
private function buildInCondition($operator, $operands)
{
if (!isset($operands[0], $operands[1])) {
throw new Exception("Operator '$operator' requires two operands.");
}
$values = $condition[2];
list($column, $values) = $operands;
if (!is_array($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(', ', $values) . ')';
if ($values === array()) {
return $operator === 'in' ? '0=1' : '';
}
if ($operator === 'LIKE' || $operator === 'NOT LIKE' || $operator === 'OR LIKE' || $operator === 'OR NOT LIKE') {
if ($values === array()) {
return $operator === 'LIKE' || $operator === 'OR LIKE' ? '0=1' : '';
}
foreach ($values as $i => $value) {
$values[$i] = is_string($value) ? $this->connection->quoteValue($value) : (string)$value;
}
if ($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, $expressions);
if (strpos($column, '(') === false) {
$column = $this->quoteColumnName($column);
}
return "$column $operator (" . implode(', ', $values) . ')';
}
private function buildLikeCondition($operator, $operands)
{
if (!isset($operands[0], $operands[1])) {
throw new Exception("Operator '$operator' requires two operands.");
}
list($column, $values) = $operands;
if (!is_array($values)) {
$values = array($values);
}
if ($values === array()) {
return $operator === 'like' || $operator === 'or like' ? '0=1' : '';
}
if ($operator === 'like' || $operator === 'not like') {
$andor = ' and ';
} else {
$andor = ' or ';
$operator = $operator === 'or like' ? 'like' : 'not like';
}
if (strpos($column, '(') === false) {
$column = $this->quoteColumnName($column);
}
$parts = array();
foreach ($values as $value) {
$parts[] = "$column $operator " . $this->connection->quoteValue($value);
}
throw new Exception('Unknown operator: ' . $operator);
return implode($andor, $parts);
}
/**

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