/* * This sample to demonstrate Implicit Statement Caching. This can be * enabled by calling setStatementCacheSize and setImplicitCachingEnabled(true) * on the Connection Object. * * Please use jdk1.2 or later version * * Please look at the "1. stmt is ..." and "2. stmt is ..." of the * running results. They should point to the same instance (address) *  */// You need to import the java.sql package to use JDBCimport java.sql.*;import oracle.jdbc.*;class StmtCache1{  public static void main (String args [])       throws SQLException  {    // Load the Oracle JDBC driver    DriverManager.registerDriver(new oracle.jdbc.OracleDriver());    String url = "jdbc:oracle:oci8:@";    try {      String url1 = System.getProperty("JDBC_URL");      if (url1 != null)        url = url1;    } catch (Exception e) {      // If there is any security exception, ignore it      // and use the default    }    // Connect to the database    Connection conn =      DriverManager.getConnection (url, "hr", "hr");    ((OracleConnection)conn).setStatementCacheSize(1);        Connection sysconn = DriverManager.getConnection(url,                                                     "system", "manager");    String sql = "select FIRST_NAME, LAST_NAME from EMPLOYEES";    System.out.println("Beging of 1st execution");    getOpenCursors (sysconn);    // Create a Statement    PreparedStatement stmt = conn.prepareStatement (sql);    System.out.println("1. Stmt is " + stmt);    ((OracleConnection)conn).setImplicitCachingEnabled(true);    // Select the FIRST_NAME, LAST_NAME column from the EMPLOYEES table    ResultSet rset = stmt.executeQuery ();    // Iterate through the result and print the employee names    while (rset.next ())      System.out.println (rset.getString (1) + " " + rset.getString (2));    // Close the RseultSet    rset.close();    // Close the Statement    stmt.close();    System.out.println("End of 1st execution");    getOpenCursors (sysconn);    System.out.println("Reexecuting the same SQL");    stmt = conn.prepareStatement (sql);    System.out.println("2. Stmt is " + stmt);    // Select the FIRST_NAME, LAST_NAME column from the EMPLOYEES table    rset = stmt.executeQuery ();    // Iterate through the result and print the employee names    while (rset.next ())      System.out.println (rset.getString (1) + " " + rset.getString (2));    // Close the RseultSet    rset.close();    // Close the Statement    stmt.close();      System.out.println("End of 2nd execution");    getOpenCursors (sysconn);    // Close the connection    conn.close();       System.out.println("After close of connection");    getOpenCursors (sysconn);    sysconn.close();  }  private static void getOpenCursors (Connection conn)     throws SQLException  {     System.out.println("Open Cusrors are : ");     Statement stmt = conn.createStatement();     ResultSet rs = stmt.executeQuery ("select SQL_TEXT from V$OPEN_CURSOR");     while (rs.next())       System.out.println("Cursor's sql text is " + rs.getString(1));     rs.close();     rs = null;     stmt.close();     stmt = null;  }}