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By Shanmugasundaram, Memon

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Example text

Qxd 1/27/06 12:41 PM Page 15 CHAPTER 1 ■ WHAT IS JDBC PROGRAMMING? Database metadata is most often used by tools or developers who write programs that use advanced, nonstandard database features and by programs that dynamically discover database objects such as schemas, catalogs, tables, views, and stored procedures. Some of the DatabaseMetaData methods return results in the form of a ResultSet object. The question is how should we handle ResultSet objects as return values? getXXX() methods, such as getString() and getInt().

4. The query returns a ResultSet. To find out the names of the column rows in that ResultSet, obtain an instance of the ResultSetMetaData class. getMetaData(); if (dbMetaData == null) { // Database metadata is NOT supported } else { // Database metadata is supported and you can invoke // over 100 methods defined in DatabaseMetaData // Now that we have a valid database metadata (DatabaseMetaData) object // it can be used to do something useful: // Retrieves whether this database supports using columns not included in // the SELECT statement in a GROUP BY clause provided that all of the // columns in the SELECT statement are included in the GROUP BY clause.

5, the DatabaseMetaData allows you to obtain information about the database and has over one hundred methods. html. To obtain a DatabaseMetaData object, use these general steps: 1. Connect to a database by using an instance of the Connection object. 2. To find out the names of the database schema, tables, and columns, get an instance of the DatabaseMetaData object from the Connection. 3. Perform the actual query by issuing a SQL query string. Then use the Connection to create a Statement class to represent your query.

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