ColumnResult constructor

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- PHP Manual
- mysql_xdevapi\ColumnResult
- ColumnResult constructor

# ColumnResult::__construct

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ColumnResult::__construct — ColumnResult constructor

### Description

private mysql_xdevapi\ColumnResult::__construct()

Retrieves column metadata, such as its character set; this is instantiated by the mysql_xdevapi\RowResult::getColumns() method.

### Parameters

This function has no parameters.

### Examples

Example #1 mysql_xdevapi\ColumnResult::__construct() example

    <?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());

The above example will output something similar to:

    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
            )
    )