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import java.sql.*; |
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|
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/** |
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* A main method to test how to insert MULTIPLE rows to a mySQL |
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* database table in a single transaction. This is required so |
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* that the id references may be inserted to multiple tables |
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* using an autoincrement field. |
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* |
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* CONCLUSION: This class makes use of transaction features on |
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* the mySQL database. Running the main method reveals that MySQL |
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* versions older than 3.23.15 do not support transactions. |
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* This is unfortunate, as raptor currently uses 3.22.32-log. |
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* We shall have to find another way of doing things... |
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* |
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* IMPORTANT: This method obtains the database user and database |
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* connection password from the Password class. As such, this |
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* class may be safely placed in a public CVS repository. |
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* |
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* @author $Author: pjm2 $ |
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* @version $Id: DBMultipleInsertTest.java,v 1.1 2000/12/04 09:54:03 pjm2 Exp $ |
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*/ |
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class DBMultipleInsertTest { |
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|
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public static void main(String[] args){ |
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|
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// Create an instance of the mySQL driver. |
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try{ |
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Class.forName("org.gjt.mm.mysql.Driver").newInstance(); |
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} |
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catch(Exception e){ |
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e.printStackTrace(); |
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} |
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|
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try { |
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// Use the connection string for our group database. |
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Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/co600_10_db?user="+Password.mySQLUser+"&password="+Password.mySQLPassword); |
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|
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// Create a statement object. |
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Statement stmt = conn.createStatement(); |
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|
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// Do NOT commit after each statement. |
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conn.setAutoCommit(false); |
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|
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// A couple of SQL statements to try out... |
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String sql1 = "INSERT INTO cpu (id, cpu_no, cpu_load) VALUES (3, 4, 5);"; |
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String sql2 = "INSERT INTO cpu (id, cpu_no, cpu_load) VALUES (7, 8, 9);"; |
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|
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// Execute the insert statements. |
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stmt.executeUpdate(sql1); |
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stmt.executeUpdate(sql2); |
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|
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// Now commit the results. |
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conn.commit(); |
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|
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// Restore autocommit. |
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conn.setAutoCommit(true); |
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|
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// Close the statement and database connection. |
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stmt.close(); |
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conn.close(); |
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} |
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catch (SQLException e) { |
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System.out.println("SQLException: " + e.getMessage()); |
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System.out.println("SQLState: " + e.getSQLState()); |
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System.out.println("VendorError: " + e.getErrorCode()); |
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} |
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} |
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} |
