define external counter function SQLColumns
     (  read-only SQL_handle_type StatementHandle,
        value stream CatalogName,
        value counter NameLength1,
        value stream SchemaName,
        value counter NameLength2,
        value stream TableName,
        value counter NameLength3,
        value stream ColumnName,
        value counter NameLength4 )

Returns the list of column names in specified tables. The information is returned as a result set on the specified statement handle.

Input arguments:

• StatementHandle.
• CatalogName.The catalog name. If a driver supports catalogs for some tables but not others, such as when the driver retrieves data from different DBMSs, an empty string ("") denotes tables without catalogs. CatalogName cannot contain a string search pattern.
• NameLength1. The length of CatalogName.
• SchemaName. The string-search pattern for schema names. If a driver supports schemas for some tables but not others, such as when the driver retrieves data from different DBMSs, an empty string ("") denotes tables without schemas.
• NameLength2. The length of SchemaName.
• TableName. The string-search pattern for table names.
• NameLength3. The length of TableName.
• ColumnName. The string-search pattern for column names.
• NameLength4. The length of ColumnName.