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