WordPress开发手册:maybe_add_column()

函数原型

maybe_add_column( string $table_name, string $column_name, string $create_ddl ): bool

函数描述

是否弃用

未弃用

函数参数

$table_name
string
Required

Database table name.

$column_name
string
Required

Table column name.

$create_ddl
string
Required

SQL statement to add column.

函数返回值

函数位置

函数源码

function maybe_add_column( $table_name, $column_name, $create_ddl ) {
	global $wpdb;

	foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
		if ( $column === $column_name ) {
			return true;
		}
	}

	// Didn't find it, so try to create it.
	$wpdb->query( $create_ddl );

	// We cannot directly tell that whether this succeeded!
	foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
		if ( $column === $column_name ) {
			return true;
		}
	}

	return false;
}

源码链接

WordPress
Github

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