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ODBC and DBMS Independence
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By providing a uniform API and its driver manager architecture, ODBC goes a long way toward providing a cross-vendor API for database access, but it s impossible to provide fully transparent access. The ODBC drivers for the various database systems can easily mask cosmetic differences in their SQL dialects and API suites, but more fundamental differences are difficult or impossible to mask. ODBC provides a partial solution to this problem by providing several different levels of ODBC capability, and by making each ODBC driver self-describing through the ODBC/CLI calls that return information about general functionality, supported functions, and supported data types. However, the existence of different capability levels and profiles effectively pushes the DBMS differences right back into the application program, which must deal with this nonuniformity of ODBC drivers. In practice, the vast majority of application programs rely on only the basic, core set of ODBC functionality and don t bother with more advanced features or profiles.
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One of the areas where ODBC offers capability beyond the SQL/CLI standard is the retrieval of information about the structure of a database from its system catalog. As a part of the ANSI/ISO SQL standard, the CLI assumes that this information (about tables, columns, privileges, and so forth) is available through the SQL Information Schema, as described in 16. ODBC doesn t assume the presence of an Information Schema. Instead, it provides a set of specialized functions, shown in Table 19-4, that provide information about the structure of a data source. By calling these functions and processing their results, an application program can determine, at runtime, information about the tables, columns, privileges, primary keys, foreign keys, and stored procedures that form the structure of a data source. However, to preserve security, these functions return information only about objects to which the user has specific access. The ODBC catalog functions typically aren t needed by an application program that is written for a specific purpose. However, they are essential for a general-purpose program, such as a query program, report generator, or data analysis tool. The catalog functions can be called any time after a connection to a data source has been made. For example, a reportwriting program might call SQLConnect() and then immediately call SQLTables() to determine which tables are available in the target data source. The tables could then be presented in a list on the screen, allowing the user to select which table should be used to generate a report.
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PART V
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Part V:
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Function SQLTables SQLColumns SQLStatistics SQLSpecialColumns SQLPrimaryKeys SQLForeignKeys SQLTablePrivileges SQLColumnPrivileges SQLProcedures SQLProcedureColumns SQLGetTypeInfo
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TABLE 19-4
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Description Returns a list of catalogs, schemas, tables, or table types in the data source Returns a list of columns in one or more tables Returns a list of statistics about a single table along with a list of indexes associated with that table Returns a list of columns that uniquely identifies a row in a single table; also returns a list of columns in that table that are automatically updated Returns a list of columns that compose the primary key of a single table Returns a list of foreign keys in a single table or a list of foreign keys in other tables that refer to a single table Returns a list of privileges associated with one or more tables Returns a list of privileges associated with one or more columns in a single table Returns a list of procedures in the data source Returns a list of input and output parameters, the return value, and the columns in the result set of a single procedure Returns a list of the SQL data types supported by the data source
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