All catalog functions accept arguments with which an application can restrict the scope of the data returned. For example, the first and second calls to SQLTables in the following code return a result set containing information about all tables, while the third call returns information about the Orders table:
SQLTables(hstmt1, NULL, 0, NULL, 0, NULL, 0, NULL, 0);
SQLTables(hstmt2, NULL, 0, NULL, 0, "%", SQL_NTS, NULL, 0);
SQLTables(hstmt3, NULL, 0, NULL, 0, "Orders", SQL_NTS, NULL, 0);
Catalog function string arguments fall into four different types: ordinary arguments (OA), pattern value arguments (PV), identifier arguments (ID), and value list arguments (VL). Most string arguments can be of one of two different types, depending on the value of the SQL_ATTR_METADATA_ID statement attribute. The following table lists the arguments for each catalog function and describes the type of the argument for a SQL_TRUE or SQL_FALSE value of SQL_ATTR_METADATA_ID.
Function |
Argument |
Type when QL_ ATTR_METADATA_ ID = SQL_FALSE |
Type when SQL_ ATTR_METADATA_ ID = SQL_TRUE |
| SQLColumnPrivileges | CatalogName SchemaName TableName ColumnName |
OA OA OA PV |
ID ID ID ID |
| SQLColumns | CatalogName SchemaName TableName ColumnName |
OA PV PV PV |
ID ID ID ID |
| SQLForeignKeys | PKCatalogName PKSchemaName PKTableName FKCatalogName FKSchemaName FKTableName |
OA OA OA OA OA OA |
ID ID ID ID ID ID |
| SQLPrimaryKeys | CatalogName SchemaName TableName |
OA OA OA |
ID ID ID |
| SQLProcedureColumns | CatalogName SchemaName ProcName ColumnName |
OA PV PV PV |
ID ID ID ID |
| SQLProcedures | CatalogName SchemaName ProcName |
OA PV PV |
ID ID ID |
| SQLSpecialColumns | CatalogName SchemaName TableName |
OA OA OA |
ID ID ID |
| SQLStatistics | CatalogName SchemaName TableName |
OA OA OA |
ID ID ID |
| SQLTablePrivileges | CatalogName SchemaName TableName |
OA PV PV |
ID ID ID |
| SQLTables | CatalogName SchemaName TableName TableType |
PV PV PV VL |
ID ID ID VL |