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ColumnResult::__construct — ColumnResult 建構函式
擷取欄位中繼資料，例如其字元集；這是由 mysql_xdevapi\RowResult::getColumns() 方法所建立的實例。
這個函數沒有參數。
範例 #1 mysql_xdevapi\ColumnResult::__construct() 範例
<?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();
// 傳回一個 ColumnResult 物件的陣列
$columns = $result1->getColumns();
foreach ($columns as $column) {
echo "\n欄位標籤 " , $column->getColumnLabel();
echo " 的類型為 " , $column->getType();
echo " 且為 ", ($column->isNumberSigned() === 0) ? "無號數。" : "有號數。";
}
// 或者
$result2 = $session->sql("SELECT * FROM nonsense.numbers")->execute();
// 傳回一個 FieldMetadata 物件的陣列
print_r($result2->getColumns());上述範例將輸出類似以下的內容
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
)
)