WordPress开发手册:maybe_drop_column()

函数原型

maybe_drop_column( string $table_name, string $column_name, string $drop_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.

$drop_ddl
string
Required

SQL statement to drop column.

函数返回值

函数位置

函数源码

function maybe_drop_column( $table_name, $column_name, $drop_ddl ) {
	global $wpdb;

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

			// Found it, so try to drop it.
			$wpdb->query( $drop_ddl );

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

	// Else didn't find it.
	return true;
}

源码链接

WordPress
Github

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