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CHAPTER 3 DATABASE METADATA, PART 2
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int[] updateCounts = stmt.executeBatch(); conn.commit(); rs = stmt.executeQuery("SELECT * FROM batch_table"); System.out.println("-- Table batch_table after insertion --"); while (rs.next()) { String id = rs.getString("id"); String name = rs.getString("name"); System.out.println("id="+id +" name="+name); } } catch(BatchUpdateException b) { System.err.println("SQLException: " + b.getMessage()); System.err.println("SQLState: " + b.getSQLState()); System.err.println("Message: " + b.getMessage()); System.err.println("Vendor error code: " + b.getErrorCode()); System.err.print("Update counts: "); int [] updateCounts = b.getUpdateCounts(); for (int i = 0; i < updateCounts.length; i++) { System.err.print(updateCounts[i] + " "); } } catch(SQLException ex) { System.err.println("SQLException: " + ex.getMessage()); System.err.println("SQLState: " + ex.getSQLState()); System.err.println("Message: " + ex.getMessage()); System.err.println("Vendor error code: " + ex.getErrorCode()); } catch(Exception e) { e.printStackTrace(); System.err.println("Exception: " + e.getMessage()); } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); } } }
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Step 3: Running the Sample Program $ javac TestBatchUpdate.java $ java TestBatchUpdate -- Table batch_table after insertion -id=11 name=Alex id=22 name=Mary id=33 name=Bob
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CHAPTER 3 DATABASE METADATA, PART 2
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Step 4: Verifying the Database Results $ mysql --user=root --password=root Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 3 to server version: 4.0.18-nt mysql> use octopus; Database changed mysql> select * from batch_table; +----+------+ | id | name | +----+------+ | 11 | Alex | | 22 | Mary | | 33 | Bob | +----+------+ 3 rows in set (0.00 sec) Step 5: Discussing the Solution Let s look at this solution in detail: Lines 1 6: Import required classes and interfaces from the java.sql package. Lines 10 17: The getConnection() method loads the JDBC driver, and then creates and returns a new database Connection object. Lines 24 35: With the JDBC 2.0 API, Statement, PreparedStatement, and CallableStatement objects have the ability to maintain a list of SQL commands that can be submitted together as a batch. They are created with an associated list, which is initially empty. You can add SQL commands to this list with the method addBatch(), and you can empty the list with the method clearBatch(). You send all of the commands in the list to the database with the method executeBatch(). In lines 32 33, the stmt object sends the three SQL commands that were added to its list of commands off to the database to be executed as a batch. Note that stmt uses the method executeBatch() to send the batch of insertions, not the method executeUpdate(), which sends only one command and returns a single update count. The database server will execute the SQL commands in the order in which they were added to the list of commands. Lines 36 43: The ResultSet object is used to retrieve all records from the batch_table. The ResultSet object is iterated to get information from all of the rows. Lines 45 61: There are two exceptions that can be thrown during a batch update operation: SQLException and BatchUpdateException. If a batch update fails, then BatchUpdateException will be thrown by the JDBC driver. If there are other database problems, then SQLException will be thrown. Lines 62 65: Finally, if there is any other exception, java.lang.Exception will be thrown. Lines 66 70: This code closes all database resources. It releases the database and JDBC resources immediately instead of waiting for them to be automatically released.
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CHAPTER
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ResultSet Metadata
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The most important motive for work in school and in life is pleasure in work, pleasure in its result, and the knowledge of the value of the result to the community. Albert Einstein he main purpose of this chapter is to introduce you to the use of JDBC s result set metadata (the java.sql.ResultSetMetaData interface). ResultSetMetaData provides metadata for the ResultSet object. ResultSetMetaData enables us to get information about the types and properties of the columns in a ResultSet object. Typically, IDEs and GUI tools often use the JDBC ResultSetMetaData class to get information about data in a particular table. In order to help you understand this interface, I will list some important questions about metadata for ResultSet objects and then answer each one in detail. Before delving into ResultSetMetaData, we will look at the meaning of metadata. Note that ResultSetMetaData is an important interface in JDBC since RowSetMetaData extends this interface. To answer questions about result set metadata, I ll provide a Java class called jcb.meta. ResultSetMetaDataTool. This class gives you ready-to-use public static methods for answering the questions listed in this chapter. For answering questions about result set metadata, I list portions of these classes at some sections, but the complete class definitions (including JavaDoc-style comments) is given in the Source Code section of the Apress website. All of the methods in this chapter are static, and each method is written to be as independent as possible. Whenever possible, the methods will return the result as XML (serialized as a String object, which can be easily converted to an XML document org.w3c.dom.Document). Also, I ll provide a utility class, DocumentManager, which can Convert org.w3c.dom.Document to XML as a serialized String object Convert XML as a serialized String object into an XML document org.w3c.dom.Document In general, it is efficient to create XML as a serialized String object. The Java/JDBC solutions are grouped in a Java package called jcb (JDBC Cook Book). The jcb package and all its associated classes will be available from the Apress website as well. For some questions in this chapter, I will combine all of our answers into a single XML output. This can save lots of time and enables a client to get all of the required information regarding result set metadata with a single call (this way, you can improve performance of your database applications for metadata access).
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