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// Create a ResultSetHandler implementation to // convert the first row into an Object[]. ResultSetHandler h = new ResultSetHandler() { public Object handle(ResultSet rs) throws SQLException { if (!rs.next()) { return null; } ResultSetMetaData meta = rs.getMetaData(); int cols = meta.getColumnCount(); Object[] result = new Object[cols]; for (int i = 0; i < cols; i++) { result[i] = rs.getObject(i + 1); } return result; } }; // Create a QueryRunner that will use connections // from the given DataSource QueryRunner run = new QueryRunner(dataSource); // Execute the query and get the results back from the handler Object[] result = (Object[]) run.query( "SELECT * FROM Person WHERE name= ", "John Doe", h); You could also perform the previous query using a java.sql.Connection object instead of a DataSource. Notice that you are responsible for closing the Connection in this example. ResultSetHandler h = ... // Define a handler the same as the previous example // No DataSource, so you must handle Connections manually QueryRunner run = new QueryRunner(); Connection conn = ... // open a connection try{ Object[] result = (Object[]) run.query( conn, "SELECT * FROM Person WHERE name= ", "John Doe", h); // do something with the result } finally { // Use this helper method, so you do not have to check for null DbUtils.close(conn); } In the previous examples, you implemented the ResultSetHandler interface to turn the first row of the ResultSet into an Object[]. This is a fairly generic implementation that can be reused across many projects. In recognition of this, DbUtils provides a set of ResultSetHandler implementations in the org.apache.commons.dbutils.handlers package that perform common transformations into arrays, Map objects, and JavaBeans. Each implementation has a version that converts just the first row and another that converts all rows in the ResultSet. QueryRunner run = new QueryRunner(dataSource);

Sometimes during application development, you might get a SQLException that you are not familiar with. In this case, you can use the following method to get some detailed information: /** * This method checks for sql exceptions and displays * error information; note that multiple exception * objects could be chained together. * @param e The SQLException object. */ public static printSQLExceptions(SQLException e) { if (e == null) { System.out.println("printSQLExceptions: exception is null."); return; } System.out.println("--- printSQLExceptions: while (e != null) { System.out.println("printSQLExceptions: System.out.println("printSQLExceptions: System.out.println("printSQLExceptions: System.out.println(""); e = e.getNextException(); } } SQLException caught ---"); SQLState: " + e.getSQLState()); Message: " + e.getMessage()); Vendor: " + e.getErrorCode());

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n building web-based database applications (such as SQL adapters and connectors), metadata plays the key role. If you do not depend on metadata, then you have to hard-code your metadata, and if you hard-code your metadata, then maintenance of such an application or system will be impossible (because the moment the database schema changes, then your application or system will collapse). JDBC enables you to discover database metadata at runtime. With database metadata, you can invoke a SQL query, find a list of tables, or execute a stored procedure. If you are interested in the various approaches to building web-based applications that access database metadata through JDBC, then this chapter is for you. In this hands-on chapter, you will learn the basics of this process using the Java servlets approach. This chapter shows you how to access database metadata from Java servlets. Our focus will be basic access to database (such as Oracle and MySQL) metadata. We will not concentrate on web frameworks such as Apache s Struts or Cocoon (these topics have their respected books on the market). This chapter will answer the following types of questions by using Java servlets and JDBC: How do you get a list of tables or views for a given database How do you get a list of column names or types for a given table or view How do you get a list of stored procedures for a given database What is the signature of a stored procedure What are the PK/FK columns for a given table How do you get ResultSet s metadata

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