Java calls mysql stored procedure instance analysis

This article illustrates how Java calls mysql stored procedures. Share with you for your reference. The details are as follows:

The test code of the database is as follows:

1. New table test

create table test(
field1 int not null
)
TYPE=MyISAM ;
insert into test(field1) values(1);

2. Delete the existing stored procedure:

--  Delete stored procedure 
delimiter //-- define the end symbol
drop procedure p_test;

3. Mysql stored procedure definition:

create procedure p_test()
begin
declare temp int;
set temp = 0; 
update test set field1 = values(temp);
end

4. Method of invocation:

CallableStatement cStmt = conn.prepareCall("{call p_test()}");
cStmt.executeUpdate();
import java.sql.*; 
 
public class ProcedureTest {
 /*
  The table and stored procedure are defined as follows: 
 delimiter // 
DROP TABLE if exists test //
  CREATE TABLE test(
   id int(11) NULL
  ) //
 drop procedure if existssp1 //
  create procedure sp1(in p int)
  comment 'insert into a int value'
  begin
   declare v1 int;
   set v1 = p;
   insert into test(id) values(v1);
  end
  //
  drop procedure if exists sp2 //
  create procedure sp2(out p int)
  begin
   select max(id) into p from test;
  end
  //
 drop procedure if exists sp6 //
  create procedure sp6()
  begin
    select * from test;
  end//
 */ 
 public static void main(String[] args) {
 //callIn(111);
 //callOut();
 callResult();
 } 
 
 public static void callIn(int in){
 //Get connected
 Connection conn = ConnectDb.getConnection();
 CallableStatement cs = null;
 try {
  //You can pass in parameters directly
  //cs = conn.prepareCall("{call sp1(1)}");
  //You can also use question marks instead
  cs = conn.prepareCall("{call sp1(?)}");
  //Set the value of the first input parameter to 110
  cs.setInt(1, in);
  cs.execute();
 } catch (Exception e) {
  e.printStackTrace();
 } finally {
  try {
  if(cs != null){
   cs.close();
  }
  if(conn != null){
   conn.close();
  }
  } catch (Exception ex) {
  ex.printStackTrace();
  }
 }
 }
 
 public static void callOut() {
 Connection conn = ConnectDb.getConnection();
 CallableStatement cs = null;
 try {
  cs = conn.prepareCall("{call sp2(?)}");
  //The first argument is of type Int
  cs.registerOutParameter(1, Types.INTEGER);
  cs.execute();
  //I get my first value
  int i = cs.getInt(1);
  System.out.println(i);
 } catch (Exception e) {
  e.printStackTrace();
 } finally {
  try {
  if(cs != null){
   cs.close();
  }
  if(conn != null){
   conn.close();
  }
  } catch (Exception ex) {
  ex.printStackTrace();
  }
 }
 }
 
 public static void callResult(){
 Connection conn = ConnectDb.getConnection();
 CallableStatement cs = null;
 ResultSet rs = null;
 try {
  cs = conn.prepareCall("{call sp6()}");
  rs = cs.executeQuery();
  //Cyclic output
  while(rs.next()){
  System.out.println(rs.getString(1));
  }
 } catch (Exception e) {
  e.printStackTrace();
 } finally {
  try {
  if(rs != null){
   rs.close();
  }
  if(cs != null){
   cs.close();
  }
  if(conn != null){
   conn.close();
  }
  } catch (Exception ex) {
  ex.printStackTrace();
  }
 }
 }
} 

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; 
class ConnectDb {
 public static Connection getConnection(){
 Connection conn = null;
 PreparedStatement preparedstatement = null;
 try {
  Class.forName("org.gjt.mm.mysql.Driver").newInstance(); 
  String dbname = "test";
  String url="jdbc:mysql://localhost/"+dbname+"?user=root&password=root&useUnicode=true&characterEncoding=8859_1";
  conn= DriverManager.getConnection(url);
 } catch (Exception e) {
  e.printStackTrace();
 } 
 return conn;
 } 
}

I hope this article has been helpful to your Java programming.