以下示例將演示spring jdbc如何調(diào)用存儲(chǔ)過程。將通過調(diào)用存儲(chǔ)過程來讀取Student表中的一個(gè)可用記錄。將傳遞一個(gè)學(xué)生ID并獲取學(xué)生記錄信息。
語法:
SimpleJdbcCall jdbcCall = new SimpleJdbcCall(dataSource).withProcedureName("getRecord");
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"));
在上面語法中 -
jdbcCall
- 這是一個(gè)SimpleJdbcCall
對(duì)象,它用來表示存儲(chǔ)過程。in
- 這是一個(gè)SqlParameterSource
對(duì)象用于將參數(shù)傳遞給存儲(chǔ)過程。student
- Student對(duì)象。out
- Map
對(duì)象來表示存儲(chǔ)過程調(diào)用結(jié)果的輸出。SimpleJdbcCall
類可用于使用IN
和OUT
參數(shù)調(diào)用存儲(chǔ)過程。 可以在使用任何RDBMS(如Apache Derby,DB2,MySQL,Microsoft SQL Server,Oracle和Sybase)時(shí)使用此方法。
要了解這個(gè)方法的使用,請(qǐng)考慮以下MySQL存儲(chǔ)過程,該過程需要學(xué)生ID,并使用OUT
參數(shù)返回相應(yīng)的學(xué)生姓名和年齡。在MySQL命令提示符在TEST數(shù)據(jù)庫中創(chuàng)建這個(gè)存儲(chǔ)過程 -
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 ;
要了解上面提到的Spring JDBC相關(guān)的概念,這里創(chuàng)建一個(gè)項(xiàng)目用來演示如何調(diào)用數(shù)據(jù)中的存儲(chǔ)過程。打開Eclipse IDE,并按照以下步驟創(chuàng)建一個(gè)名稱為:CallingStoredProcedure 的Spring應(yīng)用程序項(xiàng)目。
步驟說明
完整的項(xiàng)目結(jié)構(gòu)如下所示 -
文件 : pom.xml 的內(nèi)容 -
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.yiibai</groupId>
<artifactId>CallingStoredProcedure</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.40</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
</dependencies>
</project>
以下是數(shù)據(jù)訪問對(duì)象接口文件:StudentDAO.java的代碼內(nèi)容:
package com.yiibai;
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 list down a record from the Student
* table corresponding to a passed student id.
*/
public Student getStudent(Integer id);
}
以下是文件:Student.java的代碼內(nèi)容:
package com.yiibai;
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;
}
}
以下是文件:StudentMapper.java的代碼內(nèi)容:
package com.yiibai;
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;
}
}
以下是實(shí)現(xiàn)類文件:StudentJDBCTemplate.java
,它實(shí)現(xiàn)了接口StudentDAO.java
:
以下是文件:StudentJDBCTemplate.java的代碼內(nèi)容:
package com.yiibai;
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 JdbcTemplate jdbcTemplateObject;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
this.jdbcTemplateObject = new JdbcTemplate(dataSource);
}
public Student getStudent(Integer id) {
SimpleJdbcCall jdbcCall = new SimpleJdbcCall(dataSource).withProcedureName("getRecord");
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;
}
}
上面編寫的執(zhí)行調(diào)用代碼涉及創(chuàng)建包含IN
參數(shù)的SqlParameterSource
對(duì)象。 將輸入值提供的名稱與存儲(chǔ)過程中聲明的參數(shù)名稱的名稱進(jìn)行匹配很重要。execute
方法采用IN
參數(shù),并返回一個(gè)Map
對(duì)象,其中包含由存儲(chǔ)過程中指定的名稱鍵入的任何輸出參數(shù)。
以下是程序執(zhí)行入口文件:MainApp.java的代碼內(nèi)容:
package com.yiibai;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.yiibai.StudentJDBCTemplate;
public class MainApp {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("application-beans.xml");
StudentJDBCTemplate studentJDBCTemplate = (StudentJDBCTemplate) context.getBean("studentJDBCTemplate");
System.out.println("Get Student Where ID is : 1");
Student student = studentJDBCTemplate.getStudent(1);
System.out.print("ID : " + student.getId());
System.out.print(", Name : " + student.getName());
System.out.println(", Age : " + student.getAge());
System.out.println("Get Student Where ID is : 3");
Student student2 = studentJDBCTemplate.getStudent(3);
System.out.print("ID : " + student2.getId());
System.out.print(", Name : " + student2.getName());
System.out.println(", Age : " + student2.getAge());
}
}
以下是Bean和數(shù)據(jù)庫配置文件:application-beans.xml的代碼內(nèi)容:
<?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?characterEncoding=utf8&useSSL=true" />
<property name="username" value="root" />
<property name="password" value="123456" />
</bean>
<!-- Definition for studentJDBCTemplate bean -->
<bean id="studentJDBCTemplate" class="com.yiibai.StudentJDBCTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
注意: application-beans.xml 文件的位置是:{workspace}/fistapp/src/main/java 目錄,如果放置錯(cuò)了,程序可能會(huì)因?yàn)檎也坏酱伺渲梦募鲥e(cuò)。
完成創(chuàng)建源代碼和bean和數(shù)據(jù)庫連接信息的文件配置后,運(yùn)行應(yīng)用程序。這里先簡(jiǎn)單說明一下運(yùn)行的步驟,在項(xiàng)目名稱(CallingStoredProcedure)上點(diǎn)擊右鍵,在彈出的菜單中選擇:【Run As】-> 【Maven test】
在運(yùn)行測(cè)試成功后,應(yīng)該會(huì)輸出類似以下內(nèi)容(含有 BUILD SUCCESS 的信息) 。
接下來,點(diǎn)擊類文件:MainApp.java 選擇【Run As】->【Java Application】,如果應(yīng)用程序一切正常,這將打印以下消息:
Get Student Where ID is : 1
ID : 1, Name : Maxsu, Age : 19
Get Student Where ID is : 3
ID : 3, Name : Allen, Age : 27