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    ColumnResult::__construct

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    ColumnResult::__construct — ColumnResult のコンストラクタ

    説明

    private mysql_xdevapi\ColumnResult::__construct()

    キャラクタセットのような、カラムのメタデータを取得します。 mysql_xdevapi\RowResult::getColumns() によってインスタンス化されます。

    パラメータ

    この関数にはパラメータはありません。

    例

    例1 mysql_xdevapi\ColumnResult::__construct() の例

    <?php
    $session     = mysql_xdevapi\getSession("mysqlx://user:password@localhost");

    $session->sql("DROP DATABASE IF EXISTS nonsense")->execute();
    $session->sql("CREATE DATABASE nonsense")->execute();
    $session->sql("CREATE TABLE nonsense.numbers (hello int, world float unsigned)")->execute();
    $session->sql("INSERT INTO nonsense.numbers values (42, 42)")->execute();

    $schema = $session->getSchema("nonsense");
    $table = $schema->getTable("numbers");

    $result1 = $table->select('hello','world')->execute();

    // Returns an array of ColumnResult objects
    $columns = $result1->getColumns();

    foreach (    $columns as $column) {
    echo     "\nColumn label " , $column->getColumnLabel();
    echo     " is type " , $column->getType();
    echo     " and is ", ($column->isNumberSigned() === 0) ? "unsigned." : "signed.";
    }

    // Alternatively
    $result2 = $session->sql("SELECT * FROM nonsense.numbers")->execute();

    // Returns an array of FieldMetadata objects
    print_r($result2->getColumns());

    上の例の出力は、 たとえば以下のようになります。

    Column label hello is type 19 and is signed.
Column label world is type 4  and is unsigned.

Array
(
    [0] => mysql_xdevapi\FieldMetadata Object
        (
            [type] => 1
            [type_name] => SINT
            [name] => hello
            [original_name] => hello
            [table] => numbers
            [original_table] => numbers
            [schema] => nonsense
            [catalog] => def
            [collation] => 0
            [fractional_digits] => 0
            [length] => 11
            [flags] => 0
            [content_type] => 0
        )
    [1] => mysql_xdevapi\FieldMetadata Object
        (
            [type] => 6
            [type_name] => FLOAT
            [name] => world
            [original_name] => world
            [table] => numbers
            [original_table] => numbers
            [schema] => nonsense
            [catalog] => def
            [collation] => 0
            [fractional_digits] => 31
            [length] => 12
            [flags] => 1
            [content_type] => 0
        )
)

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