Spring JDBC批量操作

以下示例将演示如何使用spring jdbc进行批量更新。我们将在单次批次操作中更新student表中的记录。

student表的结果如下 -

CREATE TABLE student( id INT NOT NULL AUTO_INCREMENT, name VARCHAR(20) NOT NULL, age INT NOT NULL, PRIMARY KEY (id) ); 

SQL

语法：

String SQL = "update Student set age = ? where id = ?"; int[] updateCounts = jdbcTemplateObject.batchUpdate(SQL, new BatchPreparedStatementSetter() { public void setValues(PreparedStatement ps, int i) throws SQLException { ps.setInt(1, students.get(i).getAge()); ps.setInt(2, students.get(i).getId()); } public int getBatchSize() { return students.size(); } }); 

Java

在上面语法中 -

• SQL - 更新语句以更新学生的年龄。
• BatchPreparedStatementSetter - 批量执行者，在PerparedStatement对象中设置每个项目的值，由学生对象和索引i列出。 getBatchSize()返回批处理的数量。
• jdbcTemplateObject - NamedParameterJdbcTemplate对象来更新数据库中的学生对象。
• updateCounts - int数组包含每个更新查询更新的行计数(数量)。

创建项目

要了解上面提到的Spring JDBC相关的概念，这里创建一个项目用来演示如何执行批量更新。打开Eclipse IDE，并按照以下步骤创建一个名称为：BatchOperation 的Spring应用程序项目。

步骤说明

1. 参考第一个Spring JDBC项目来创建一个Maven项目 - http://www.yiibai.com/springjdbc/first_application.html
2. 更新bean配置并运行应用程序。

完整的项目结构如下所示 -

文件 : pom.xml 的内容 -

<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>BatchOperation</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>BatchOperation</name>
    <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>

以下是数据访问对象接口文件：StudentDAO.java的代码内容：

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 all the records from the * Student table. */ public List<Student> listStudents(); public void create(String name, Integer age); public void batchUpdate(final List<Student> students); } 

Java

以下是文件：Student.java的代码内容：

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; } } 

Java

以下是文件：StudentMapper.java的代码内容：

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; } } 

Java

以下是文件：StudentJDBCTemplate.java的代码内容：

package com.yiibai; import java.sql.PreparedStatement; import java.util.List; import javax.sql.DataSource; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.BatchPreparedStatementSetter; import java.sql.SQLException; 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 List<Student> listStudents() { String SQL = "select * from Student"; List<Student> students = jdbcTemplateObject.query(SQL, new StudentMapper()); return students; } public void batchUpdate(final List<Student> students) { String SQL = "update Student set age = ? where id = ?"; int[] updateCounts = jdbcTemplateObject.batchUpdate(SQL, new BatchPreparedStatementSetter() { public void setValues(PreparedStatement ps, int i) throws SQLException { ps.setInt(1, students.get(i).getAge()); ps.setInt(2, students.get(i).getId()); } public int getBatchSize() { return students.size(); } }); System.out.println("Records updated!"); } public void create(String name, Integer age) { // TODO Auto-generated method stub String insertQuery = "insert into student (name, age) values (?, ?)"; jdbcTemplateObject.update( insertQuery, name, age); System.out.println("Created Record Name = " + name + " Age = " + age); return; } } 

Java

以下是程序执行入口文件：MainApp.java的代码内容：

package com.yiibai; import java.util.ArrayList; 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("------Records Creation--------"); studentJDBCTemplate.create("Maxsu", 21); studentJDBCTemplate.create("Curry", 22); studentJDBCTemplate.create("Weiwei", 25); List<Student> initialStudents = studentJDBCTemplate.listStudents(); System.out.println("Initial Students"); for (Student student2 : initialStudents) { System.out.print("ID : " + student2.getId()); System.out.println(", Age : " + student2.getAge()); } Student student = new Student(); student.setId(1); student.setAge(25); Student student1 = new Student(); student1.setId(3); student1.setAge(25); List<Student> students = new ArrayList<Student>(); students.add(student); students.add(student1); studentJDBCTemplate.batchUpdate(students); List<Student> updatedStudents = studentJDBCTemplate.listStudents(); System.out.println("Updated Students"); for (Student student3 : updatedStudents) { System.out.print("ID : " + student3.getId()); System.out.println(", Age : " + student3.getAge()); } } } 

Java

以下是Bean和数据库配置文件：application-beans.xml的代码内容：

<?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> 

XML

注意： application-beans.xml 文件的位置是：{workspace}/fistapp/src/main/java 目录，如果放置错了，程序可能会因为找不到此配置文件而出错。

完成创建源代码和bean和数据库连接信息的文件配置后，运行应用程序。这里先简单说明一下运行的步骤，在项目名称(BatchOperation)上点击右键，在弹出的菜单中选择：【Run As】-> 【Maven test】

在运行测试成功后，应该会输出类似以下内容(含有 BUILD SUCCESS 的信息) 。
接下来，点击类文件：MainApp.java 选择【Run As】->【Java Application】，如果应用程序一切正常，这将打印以下消息：

------Records Creation--------
Created Record Name = Maxsu Age = 21
Created Record Name = Curry Age = 22
Created Record Name = Weiwei Age = 25
Initial Students
ID : 1, Age : 21
ID : 2, Age : 22
ID : 3, Age : 25
Records updated!
Updated Students
ID : 1, Age : 25
ID : 2, Age : 22
ID : 3, Age : 25

Shell

数据库中的student表中的数据被修改为：

mysql> select * from student; +----+--------+-----+ | id | name | age | +----+--------+-----+ | 1 | Maxsu | 25 | | 2 | Curry | 22 | | 3 | Weiwei | 25 | +----+--------+-----+ 3 rows in set mysql>