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PDOStatement->getColumnMeta()
Returns metadata for a column in a result set
()
PDOStatement {
array getColumnMeta(int column);
}This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
Retrieves the metadata for a 0-indexed column in a result set as an associative array.
Not all PDO drivers support PDOStatement->getColumnMeta().
Return Values
Returns an associative array containing the following values representing the metadata for a single column:
Table 250. Column metadata
| Name | Value |
|---|---|
native_type | The PHP native type used to represent the column value. |
driver:decl_type | The SQL type used to represent the column value in the database. If the column in the result set is the result of a function, this value is not returned by PDOStatement->getColumnMeta(). |
flags | Any flags set for this column. |
name | The name of this column as returned by the database. |
table | The name of this column's table as returned by the database. |
len | The length of this column. Normally -1 for
types other than floating point decimals. |
precision | The numeric precision of this column. Normally
0 for types other than floating point
decimals. |
pdo_type | The type of this column as represented by the
PDO::PARAM_* constants. |
Returns FALSE if the requested column does not exist in the result set,
or if no result set exists.
Examples
Example 1790. Retrieving column metadata
The following example shows the results of retrieving the metadata for a single column generated by a function (COUNT) in a PDO_SQLITE driver.
<?php
$select = $DB->query('SELECT COUNT(*) FROM fruit');
$meta = $select->getColumnMeta(0);
var_dump($meta);
?>The above example will output:
array(6) {
["native_type"]=>
string(7) "integer"
["flags"]=>
array(0) {
}
["name"]=>
string(8) "COUNT(*)"
["len"]=>
int(-1)
["precision"]=>
int(0)
["pdo_type"]=>
int(2)
}