How to insert reference values in database using JDBC?

I am trying to insert values into Oracle 10g database using the code below but its giving an error of "Missing Expression" on execution. I have to pass reference values into the insert clause but do not know the exact syntax or way of doing it. Please help me through this. Thanks.

Student Table:-

                      Sid       VARCHAR2(200) PRIMARY KEY  CHECK(Sid>0),
                      Pass_word VARCHAR2(10) NOT NULL,
                      S_name    VARCHAR2(20) NOT NULL,
                      G_name    VARCHAR2(20)         ,
                      Branch    VARCHAR2(10)开发者_C百科 NOT NULL,
                      D_company VARCHAR2(20)         ,
                      B_Percent INT NOT NULL CHECK(B_Percent<100),
                      twelth_percent INT NOT NULL CHECK(twelth_percent<100),
                      tenth_percent INT NOT NULL  CHECK(tenth_percent<100),
                      Certify   VARCHAR2(30),
                      Semester  INT NOT NULL CHECK(Semester<9),
                      D_Birth   DATE NOT NULL,
                      Sex       VARCHAR2(6) NOT NULL

CODE:

Connection connection = null;

try
{

  // Load the JDBC driver

   String driverName = "sun.jdbc.odbc.JdbcOdbcDriver";

   Class.forName(driverName);

    connection = DriverManager.getConnection("jdbc:odbc:placement","siddharth","sid");

    studentID = StudentID.getText();
    spassword = PasswordField.getPassword();
    studentname = NameField.getText();
    Gname = GuardianField.getText();
    branch = BranchField.getText();
    dcompany = DcompanyField.getText();
    bpercent = BtechField1.getText();
    twelthpercent = TwelthField.getText();
    tenthpercent = TenthField.getText();
    semester = SemesterField.getText();
    certify = CertificationField.getText();
    sex = SexCombo.getActionCommand();
    date =  (Date) DateTextField1.getValue();



    Statement stmt = connection.createStatement();
    stmt.executeUpdate("insert into student " +"(sid,pass_word,s_name,g_name,branch,d_company,b_percent,twelth_percent,tenth_percent,certify,semester,d_birth,sex)"+
                 "values(studentID, spassword,studentname,Gname,branch,dcompany,bpercent,twelthpercent,tenthpercent,certify,semester,date,sex)" );

    stmt.close();
    connection.close();
    }

    catch (ClassNotFoundException e) {
    // Could not find the database driver
      JOptionPane.showMessageDialog(null,e);
    } 
    catch (SQLException e) {
    // Could not connect to the database
      JOptionPane.showMessageDialog(null,e);
     } 

Currently your SQL statement looks like:

insert into student (sid, pass_word, ...) values (studentID, spassword, ...)

The variable names mean nothing to the SQL itself.

You should use a prepared statement. For example, your SQL should look like this:

insert into student (sid, pass_word, ...) values (?, ?, ...)

and then you use:

PreparedStatement stmt = connection.prepareStatement(sql);
stmt.setString(1, studentID);
stmt.setString(2, spassword);

// etc

See the JDBC tutorial on prepared statements for more information.

To be on the safe side you should use prepared statements.

Prepare the Query String

String updateString = "update " + dbName + ".COFFEES " +
                      "set SALES = ? where COF_NAME = ?";

Create a PrepartedStatement with this query:

updateSales = connnection.prepareStatement(updateString);

Fill the ? spaceholders with you values:

updateSales.setInt(1, myVariable1);
updateSales.setString(2, myVariable2);

execute the Query

updateSales.executeUpdate();