Spring JDBC - SqlUpdate Class

---

---

The org.springframework.jdbc.object.SqlUpdate class provides reusable operation object representing a SQL update.

Class Declaration

Following is the declaration for org.springframework.jdbc.object.SqlUpdate class −

public abstract class SqlUpdate<T>
   extends SqlOperation

Usage

• Step 1 − Create a JdbcTemplate object using a configured datasource.

• Step 2 − Create a StudentMapper object implementing RowMapper interface.

• Step 3 − Use JdbcTemplate object methods to carry out database operations while using SqlUpdate object.

Following example will demonstrate how to update a Query using SqlUpdate Object. We'll map update records from Student Table to Student object using StudentMapper object.

Syntax

String SQL = "update Student set age = ? where id = ?";

SqlUpdate sqlUpdate = new SqlUpdate(dataSource,SQL);
sqlUpdate.declareParameter(new SqlParameter("age", Types.INTEGER));
sqlUpdate.declareParameter(new SqlParameter("id", Types.INTEGER));
sqlUpdate.compile();

sqlUpdate.update(age.intValue(),id.intValue());

Where,

• SQL − Update query to update student records.

• jdbcTemplateObject − StudentJDBCTemplate object to read student records the from database.

• StudentMapper − StudentMapper object to map student records to student objects.

• sqlUpdate − SqlUpdate object to update student records.

To understand the above-mentioned concepts related to Spring JDBC, let us write an example which will read a query and map result using StudentMapper object. To write our example, let us have a working Eclipse IDE in place and use the following steps to create a Spring application.

Following is the content of the Data Access Object interface file StudentDao.java.

package com.tutorialspoint;

import java.util.List;
import javax.sql.DataSource;

public interface StudentDao {
   /** 
      * This is the method to be used to initialize
      * database resources ie. connection.
   */
   public void setDataSource(DataSource ds);
   
   /** 
      * This is the method to be used to update
      * a record into the Student table.
   */
   public void update(Integer id, Integer age);

   /** 
      * This is the method to be used to list down
      * a record from the Student table corresponding
      * to a passed student id.
   */
   public Student getStudent(Integer id);   
}

Following is the content of the Student.java file.

package com.tutorialspoint;

public class Student {
   private Integer age;
   private String name;
   private Integer id;

   public void setAge(Integer age) {
      this.age = age;
   }
   public Integer getAge() {
      return age;
   }
   public void setName(String name) {
      this.name = name;
   }
   public String getName() {
      return name;
   }
   public void setId(Integer id) {
      this.id = id;
   }
   public Integer getId() {
      return id;
   }
}

Following is the content of the StudentMapper.java file.

package com.tutorialspoint;

import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;

public class StudentMapper implements RowMapper<Student> {
   public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
      Student student = new Student();
      student.setId(rs.getInt("id"));
      student.setName(rs.getString("name"));
      student.setAge(rs.getInt("age"));
      return student;
   }
}

Following is the implementation class file StudentJDBCTemplate.java for the defined DAO interface StudentDAO.

package com.tutorialspoint;

import java.sql.Types;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.SqlParameter;
import org.springframework.jdbc.object.SqlUpdate;

public class StudentJDBCTemplate implements StudentDao {
   private DataSource dataSource;
   private JdbcTemplate jdbcTemplateObject;
   
   public void setDataSource(DataSource dataSource) {
      this.dataSource = dataSource;
      this.jdbcTemplateObject = new JdbcTemplate(dataSource);
   }
   public void update(Integer id, Integer age){
      String SQL = "update Student set age = ? where id = ?";
      
      SqlUpdate sqlUpdate = new SqlUpdate(dataSource,SQL);
      sqlUpdate.declareParameter(new SqlParameter("age", Types.INTEGER));
      sqlUpdate.declareParameter(new SqlParameter("id", Types.INTEGER));
      sqlUpdate.compile();
      sqlUpdate.update(age.intValue(),id.intValue());
      System.out.println("Updated Record with ID = " + id );
      return;
   }
   public Student getStudent(Integer id) {
      String SQL = "select * from Student where id = ?";
      Student student = jdbcTemplateObject.queryForObject(SQL, new Object[]{id}, new StudentMapper());
      return student;
   }
}

Following is the content of the MainApp.java file.

package com.tutorialspoint;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.tutorialspoint.StudentJDBCTemplate;

public class MainApp {
   public static void main(String[] args) {
      ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
      StudentJDBCTemplate studentJDBCTemplate = (StudentJDBCTemplate)context.getBean("studentJDBCTemplate");
      
      System.out.println("----Updating Record with ID = 1 -----" );
      studentJDBCTemplate.update(1, 10);
      
      System.out.println("----Listing Record with ID = 1 -----" );
      Student student = studentJDBCTemplate.getStudent(1);
      
      System.out.print("ID : " + student.getId() );
      System.out.print(", Name : " + student.getName() );
      System.out.println(", Age : " + student.getAge());  
   }
}

Following is the configuration file Beans.xml.

<?xml version = "1.0" encoding = "UTF-8"?>
<beans xmlns = "http://www.springframework.org/schema/beans"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation = "http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">

   <!-- Initialization for data source -->
   <bean id = "dataSource" 
      class = "org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name = "driverClassName" value = "com.mysql.jdbc.cj.Driver"/>
      <property name = "url" value = "jdbc:mysql://localhost:3306/TEST"/>
      <property name = "username" value = "root"/>
      <property name = "password" value = "admin"/>
   </bean>

   <!-- Definition for studentJDBCTemplate bean -->
   <bean id = "studentJDBCTemplate" 
      class = "com.tutorialspoint.StudentJDBCTemplate">
      <property name = "dataSource" ref = "dataSource" />    
   </bean>      
</beans>

Once you are done creating the source and bean configuration files, let us run the application. If everything is fine with your application, it will print the following message.

----Updating Record with ID = 1 -----
Updated Record with ID = 1
----Listing Record with ID = 1 -----
ID : 1, Name : Zara, Age : 10