spring framework入门(9)：spring framwor操作数据库示例spring-jdbc

示例代码：http://download.youkuaiyun.com/detail/u010476739/9922735

工具：maven、spring framework、postgresql

1.准备数据库，使用postgresql

CREATE TABLE Student(
   ID  SERIAL PRIMARY Key,
   NAME VARCHAR(20) NOT NULL,
   AGE  INT NOT NULL
); 

2.新建项目，添加依赖

<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.jackletter</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>this is name</name>
  <description>this is desc</description>
  
  <properties>
  	<spring.version>4.2.4.RELEASE</spring.version>
  	<postgresql.version>9.1-901.jdbc4</postgresql.version>
  </properties>
  
  <dependencies>
 
        <!-- Spring Core -->
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
         
        <!-- Spring Context -->
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
		<dependency>
		    <groupId>org.springframework</groupId>
		    <artifactId>spring-jdbc</artifactId>
		    <version>${spring.version}</version>
		</dependency>
		
		<dependency>
			<groupId>postgresql</groupId>
			<artifactId>postgresql</artifactId>
			<version>${postgresql.version}</version>
		</dependency>
         
    </dependencies>
</project>

3.spring配置（applicationContext.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="org.postgresql.Driver" />
		<property name="url" value="jdbc:postgresql://localhost:5432/Demo" />
		<property name="username" value="postgres" />
		<property name="password" value="huqingjie123" />
	</bean>

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

</beans>

4.代码

Student

package bean;

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;
	}
}

StudentDAO

package bean;

import java.util.List;

import javax.sql.DataSource;

public interface StudentDAO {
	public void setDataSource(DataSource dataSource);

	public void create(String name, Integer age);

	public Student getStudent(Integer id);

	public List<Student> listStudents();

	public void delete(Integer id);

	public void update(Integer id, Integer age);
}

StudentJDBCTemplate

package bean;

import java.util.List;

import javax.sql.DataSource;

import org.springframework.jdbc.core.JdbcTemplate;

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 create(String name, Integer age) {
		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) {
		String SQL = "select * from Student where id = ?";
		Student student = jdbcTemplateObject.queryForObject(SQL, new Object[] { id }, new StudentMapper());
		return student;
	}

	public List<Student> listStudents() {
		String SQL = "select * from Student";
		List<Student> students = jdbcTemplateObject.query(SQL, new StudentMapper());
		return students;
	}

	public void delete(Integer id) {
		String SQL = "delete from Student where id = ?";
		jdbcTemplateObject.update(SQL, id);
		System.out.println("Deleted Record with ID = " + id);
		return;
	}

	public void update(Integer id, Integer age) {
		String SQL = "update Student set age = ? where id = ?";
		jdbcTemplateObject.update(SQL, age, id);
		System.out.println("Updated Record with ID = " + id);
		return;
	}

}

StudentMapper

package bean;

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;
	}
}

App

package springjdbc;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import bean.Student;
import bean.StudentJDBCTemplate;

public class App {
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.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("----Updating Record with ID = 2 -----");
		studentJDBCTemplate.update(2, 20);

		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());

	}
}