JDBC link Oracle reference code

package com.gr.util;import java.sql.CallableStatement;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.Types;public class ConnectionManager { public static void main(String[] args) {  try {   Class.forName("oracle.jdbc.driver.OracleDriver");   String url = "jdbc:oracle:thin:@localhost:1521:cui";   Connection conn = DriverManager.getConnection(url, "cui", "cui");   System.out.println(" Link successful ：" + conn.toString());   conn.setAutoCommit(true); //  Set up auto submit    //  Call a stored procedure with parameters and return values    //  Note that the position and type of parameters here must be consistent with those defined in the stored procedure , Output parameters for registration , And input parameters to assign values    CallableStatement cstmp = conn     .prepareCall("{call insert_class(?,?)}");   cstmp.registerOutParameter(1, Types.INTEGER);   cstmp.setString(2, " Stored procedure group ");   cstmp.execute();   //  no return value    // cstmp.executeUpdate();   int newId = cstmp.getInt(1);   System.out.println(newId);   //  Inquire about , With paging statement    String sql_select = "SELECT * FROM (SELECT A.*, ROWNUM RN FROM (SELECT * FROM classes) A WHERE ROWNUM <= ?)WHERE RN >= ?";   PreparedStatement pstmt_sel = conn.prepareStatement(sql_select);   pstmt_sel.setInt(1, 4);   pstmt_sel.setInt(2, 3);   ResultSet rs = pstmt_sel.executeQuery();   while (rs.next()) {    System.out.println(rs.getInt("id") + " "      + rs.getString("classname"));   }   //  increase    String sql_insert = "insert into classes values(class_seq.nextval,?)";   PreparedStatement pstmt_add = conn.prepareStatement(sql_insert);   pstmt_add.setString(1, "JDBC test ");   int result_insert = pstmt_add.executeUpdate();   System.out.println(result_insert);   //  Delete    String sql_delete = "delete from classes where id=?";   PreparedStatement pstmt_del = conn.prepareStatement(sql_delete);   pstmt_del.setInt(1, 6);   int result_delete = pstmt_del.executeUpdate();   System.out.println(result_delete);   //  modify    String sql_update = "update classes set classname=? where id=?";   PreparedStatement pstmt_mod = conn.prepareStatement(sql_update);   pstmt_mod.setString(1, "FBI Group ");   pstmt_mod.setInt(2, 7);   int result_update = pstmt_mod.executeUpdate();   System.out.println(result_update);  } catch (Exception e) {   e.printStackTrace();  } }}

The above code is for reference only

JDBC link Oracle Refer to the code illustration