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doctrine2/manual/new/docs/en/dql-doctrine-query-language/update-queries.txt
2007-09-06 16:31:07 +00:00

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{{UPDATE}} statement syntax:
<code type="sql">
UPDATE //component_name//
SET //col_name1//=//expr1// [, //col_name2//=//expr2// ...]
[WHERE //where_condition//]
[ORDER BY ...]
[LIMIT //record_count//]
</code>
* The {{UPDATE}} statement updates columns of existing records in {{component_name}} with new values and returns the number of affected records.
* The {{SET}} clause indicates which columns to modify and the values they should be given.
* The optional {{WHERE}} clause specifies the conditions that identify which records to update. Without {{WHERE}} clause, all records are updated.
* The optional {{ORDER BY}} clause specifies the order in which the records are being updated.
* The {{LIMIT}} clause places a limit on the number of records that can be updated. You can use {{LIMIT row_count}} to restrict the scope of the {{UPDATE}}.
A {{LIMIT}} clause is a **rows-matched restriction** not a rows-changed restriction.
The statement stops as soon as it has found {{record_count}} rows that satisfy the {{WHERE}} clause, whether or not they actually were changed.
<code type="php">
$q = 'UPDATE Account SET amount = amount + 200 WHERE id > 200';
$rows = $this->conn->query($q);
// the same query using the query interface
$q = new Doctrine_Query();
$rows = $q->update('Account')
->set('amount', 'amount + 200')
->where('id > 200')
->execute();
print $rows; // the number of affected rows
</code>