Java：在数据库中创建表

Question

I have been trying to create a table in the database. The code shows no error and runs fine but in the end no table was created in the database. Help please.

public void createTable(){

    try {

    String host = "jdbc:derby://localhost:1537/fypDB";
    String uname = "test";
    String pword = "test";
    Connection con = DriverManager.getConnection( host, uname, pword );
    Statement stmt = con.createStatement();

   //username is valid variable from main class 
    String SQL = "CREATE TABLE "+username+" (classId VARCHAR(255), "+"PRIMARY KEY ( classId ))";
    stmt.executeUpdate( SQL );
    System.out.println(SQL);

    } catch (SQLException err){
        System.out.println(err.getMessage());
    }
}

Answer 1

This should do it

Class.forName("org.apache.derby.jdbc.ClientDriver");
Connection con = DriverManager.getConnection("jdbc:derby://localhost:1537/fypDB", 
                                                  "yourUsername", "ypurPassword");
Statement stmt = con.createStatement();
stmt.execute( SQL );

Dont forget to put the derbyclient.jar in you classpath and close the connection