Consume database stored procedures in MySQL using Java Spring

Some prerequisites for doing this exercise.

Create a student database table:

CREATE TABLE Student(
   ID   INT NOT NULL AUTO_INCREMENT,
   NAME VARCHAR(20) NOT NULL,
   AGE  INT NOT NULL.PRIMARY KEY (ID)
);
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Create a stored procedure:

DELIMITER $$
DROP PROCEDURE IF EXISTS `TEST`.`getRecord` $$
CREATE PROCEDURE `TEST`.`getRecord` (
IN in_id INTEGER.OUT out_name VARCHAR(20),
OUT out_age  INTEGER)
BEGIN
   SELECT name, age
   INTO out_name, out_age
   FROM Student where id = in_id;
END $$
DELIMITER ;
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Studentdao.java: studentdao.java:

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 create * a record in the Student table. */
   public void create(String name, 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);
   /** * This is the method to be used to list down * all the records from the Student table. */
   public List<Student> listStudents(a);
}
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Create a POJO Student.java:

public class Student {
   private Integer age;
   private String name;
   private Integer id;
   public void setAge(Integer age) {
      this.age = age;
   }
   public Integer getAge(a) {
      return age;
   }
   public void setName(String name) {
      this.name = name;
   }
   public String getName(a) {
      return name;
   }
   public void setId(Integer id) {
      this.id = id;
   }
   public Integer getId(a) {
      returnid; }}Copy the code

Studentmapper. Java, which maps mySQL data to Java POJO Student instance:

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"));
      returnstudent; }}Copy the code

Studentjdbctemplate. Java, implements the DAO interface StudentDAO:

import java.util.Map;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.jdbc.core.simple.SimpleJdbcCall;
public class StudentJDBCTemplate implements StudentDAO {
   private DataSource dataSource;
   private SimpleJdbcCall jdbcCall;
   public void setDataSource(DataSource dataSource) {
      this.dataSource = dataSource;
      this.jdbcCall =  new SimpleJdbcCall(dataSource).
                       withProcedureName("getRecord");
   }
   public void create(String name, Integer age) {
      JdbcTemplate jdbcTemplateObject = new JdbcTemplate(dataSource);
      String SQL = "insert into Student (name, age) values (? ,?) ";
      jdbcTemplateObject.update( SQL, name, age);
      System.out.println("Created Record Name = " + name + " Age = " + age);
      return;
   }
   public Student getStudent(Integer id) {
      SqlParameterSource in = new MapSqlParameterSource().
                              addValue("in_id", id);
      Map<String, Object> out = jdbcCall.execute(in);
      Student student = new Student();
      student.setId(id);
      student.setName((String) out.get("out_name"));
      student.setAge((Integer) out.get("out_age"));
      return student;
   }
   public List<Student> listStudents(a) {
      String SQL = "select * from Student";    
      List <Student> students = jdbcTemplateObject.query(SQL, 
                                      new StudentMapper());
      returnstudents; }}Copy the code

MainApp.java:

import java.util.List;
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("------Records Creation--------" );
      studentJDBCTemplate.create("Zara".11);
      studentJDBCTemplate.create("Nuha".2);
      studentJDBCTemplate.create("Ayan".15);
      System.out.println("------Listing Multiple Records--------" );
      List<Student> students = studentJDBCTemplate.listStudents();
      for (Student record : students) {
         System.out.print("ID : " + record.getId() );
         System.out.print(", Name : " + record.getName() );
         System.out.println(", Age : " + record.getAge());
      }
      System.out.println("----Listing Record with ID = 2 -----" );
      Student student = studentJDBCTemplate.getStudent(2);
      System.out.print("ID : " + student.getId() );
      System.out.print(", Name : " + student.getName() );
      System.out.println(", Age : "+ student.getAge()); }}Copy the code

Beans. XML:

      
<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.Driver"/>
      <property name="url" value="jdbc:mysql://localhost:3306/TEST"/>
      <property name="username" value="root"/>
      <property name="password" value="123456"/>
   </bean>

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

</beans>
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Mysql > delete student from mainapp.java;

truncate table student;

Output:

Jul 30.2020 1:20:46 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@32a1bec0: startup date [Thu Jul 30 13:20:46 CST 2020]; root of context hierarchy
Jul 30.2020 1:20:46 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [Beans.xml]
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
Jul 30, 2020 1:20:46 PM org.springframework.jdbc.datasource.DriverManagerDataSource setDriverClassName
INFO: Loaded JDBC driver: com.mysql.jdbc.Driver
------Records Creation--------
Created Record Name = Zara Age = 11
Created Record Name = Nuha Age = 2
Created Record Name = Ayan Age = 15
------Listing Multiple Records--------
ID : 1, Name : Zara, Age : 11
ID : 2, Name : Nuha, Age : 2
ID : 3, Name : Ayan, Age : 15
----Listing Record with ID = 2 -----
ID : 2, Name : Nuha, Age : 2
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