SimpleJdbcCall 類能夠被用於調用一個包含 IN 和 OUT 參數的存儲過程。你能夠在處理任何一個 RDBMS 時使用這個方法,就像 Apache Derby, DB2, MySQL, Microsoft SQL Server, Oracle,和 Sybase。java
爲了瞭解這個方法,咱們使用咱們的 Student 表,它能夠在 MySQL TEST 數據庫中使用下面的 DDL 進行建立:mysql
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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下一步,考慮接下來的 MySQL 存儲過程,該過程使用 學生 Id 而且使用 OUT 參數返回相應的學生的姓名和年齡。因此讓咱們在你的 TEST 數據庫中使用 MySQL 命令提示符建立這個存儲過程:程序員
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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如今,讓咱們編寫咱們的 Spring JDBC 應用程序,它能夠實現對咱們的 Student 數據庫表的建立和讀取操做。讓咱們使 Eclipse IDE 處於工做狀態,而後按照以下步驟建立一個 Spring 應用程序: spring
下面是數據訪問對象接口文件 StudentDAO.java 的內容:package com.cnblogs;
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();
}
下面是 Student.java 文件的內容:
package com.cnblogs;
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;
}
}
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下面是 StudentMapper.java 文件的內容:sql
package com.cnblogs;
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;
}
}
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下面是實現類文件 StudentJDBCTemplate.java,定義了 DAO 接口 StudentDAO:數據庫
**package com.cnblogs;
import java.util.List;
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() {
JdbcTemplate jdbcTemplateObject = new JdbcTemplate(dataSource);
String SQL = "select * from Student";
List<Student> students = jdbcTemplateObject.query(SQL,new StudentMapper());
return students;
}
}**
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關於上述項目的幾句話:你編寫的課調用執行的代碼涉及建立一個包含 IN 參數的 SqlParameterSource。名稱的匹配是很重要的,該名稱能夠使用在存儲過程彙總聲明的參數名稱來提供輸入值。execute 方法利用 IN 參數返回一個包含在存儲過程當中由名稱指定的任何外部參數鍵的映射。如今讓咱們移動主應用程序文件 MainApp.java,以下所示:架構
package com.cnblogs;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.cnblogs.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());
}
}
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下面是配置文件 Beans.xml:併發
<?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.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/TEST"/>
<property name="username" value="root"/>
<property name="password" value="password"/>
</bean>
<!-- Definition for studentJDBCTemplate bean -->
<bean id="studentJDBCTemplate"
class="com.cnblogs.StudentJDBCTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
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一旦你已經完成的建立了源文件和 bean 配置文件,讓咱們運行一下應用程序。若是你的應用程序一切都正常的話,這將會輸出如下消息:app
------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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