PreparedStatement: setRef(int parameterIndex, Ref x) : PreparedStatement « java.sql « Java by API

1. Java by API
2. java.sql
3. PreparedStatement

PreparedStatement: setRef(int parameterIndex, Ref x)

 

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class Main {
  public static Connection getConnection() throws Exception {
    String driver = "org.gjt.mm.mysql.Driver";
    String url = "jdbc:mysql://localhost/databaseName";
    String username = "root";
    String password = "root";
    Class.forName(driver);
    Connection conn = DriverManager.getConnection(url, username, password);
    return conn;
  }

  public static void main(String[] args) throws Exception {
    String deptName = "oldName";
    String newDeptName = "newName";

    ResultSet rs = null;
    Connection conn = null;
    PreparedStatement pstmt = null;
    PreparedStatement pstmt2 = null;
    try {
      conn = getConnection();
      // prepare query for getting a REF object and PrepareStatement object
      String refQuery = "select manager from dept_table where dept_name=?";
      pstmt = conn.prepareStatement(refQuery);
      pstmt.setString(1, deptName);
      rs = pstmt.executeQuery();
      java.sql.Ref ref = null;
      if (rs.next()) {
        ref = rs.getRef(1);
      }
      if (ref == null) {
        System.out.println("error: could not get a reference for manager.");
        System.exit(1);
      }
      String query = "INSERT INTO dept_table(dept_name, manager)values(?, ?)";
      pstmt2 = conn.prepareStatement(query);
      pstmt2.setString(1, newDeptName);
      pstmt2.setRef(2, ref);
      // execute query, and return number of rows created
      int rowCount = pstmt2.executeUpdate();
      System.out.println("rowCount=" + rowCount);
    } finally {
      pstmt.close();
      pstmt2.close();
      conn.close();
    }
  }
}

   
  

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