Spring07-jdbcTemplate

項目目錄：

2.

<?xml version="1.0" encoding="UTF-8"?>
<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.spring-04</groupId>
    <artifactId>spring-04</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>7</source>
                    <target>7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.0.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.0.8.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.0.8.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.0.8.RELEASE</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework/spring-expression -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>4.0.8.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.6</version>
        </dependency>






        <!-- DataBase數據庫連接 mysql包-->
        <!-- 添加對數據庫的支持 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.8-dmr</version>
        </dependency>

        <!-- 添加對數據源的支持 -->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>


        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.0.0.RELEASE</version>
        </dependency>



        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.0.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>compile</scope>
        </dependency>


    </dependencies>







</project>

3.db.properties:

 

xml 配置：配置c3p0,jdbcTemplate

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xmlns:context="http://www.springframework.org/schema/context"
	   xmlns:aop="http://www.springframework.org/schema/aop"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
	
	<context:component-scan base-package="com.springjdbc"></context:component-scan>
	
	<!-- 導入資源文件 -->
	<context:property-placeholder location="classpath:db.properties"/>
	
	<!-- 配置 C3P0 數據源 -->
	<bean id="dataSource"
		class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="user" value="${jdbc.username}"></property>
		<property name="password" value="${jdbc.password}"></property>
		<property name="jdbcUrl" value="${jdbc.url}"></property>
		<property name="driverClass" value="${jdbc.driver}"></property>

		<property name="initialPoolSize" value="20"></property>
		<property name="maxPoolSize" value="10"></property>
	</bean>
	
	<!-- 配置 Spirng 的 JdbcTemplate -->
	<bean id="jdbcTemplate" 
		class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	

	
</beans>

4.User類：

package com.springjdbc;

/**
 * @Author: wj
 * @Date: 2018/12/5 15:45
 * @Version 1.0
 */
public class User {

    private String openId;
    private Integer age;
    private String province;
    private Integer sex;

    public String getOpenId() {
        return openId;
    }

    public void setOpenId(String openId) {
        this.openId = openId;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }


    @Override
    public String toString() {
        return "User{" +
                "openId='" + openId + '\'' +
                ", age=" + age +
                ", province='" + province + '\'' +
                ", sex=" + sex +
                '}';
    }
}

5.crud操作：

package com.springjdbc;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author: wj
 * @Date: 2018/12/5 15:47
 * @Version 1.0
 */
public class JdbcTest {
    private ApplicationContext ctx = null;
    private JdbcTemplate jdbcTemplate;

    {
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        jdbcTemplate = (JdbcTemplate) ctx.getBean("jdbcTemplate");
}


    /**
     * 測試連接池是否正常
     * @throws SQLException
     */
    @Test
    public void testDataSource() throws SQLException {
        DataSource dataSource = ctx.getBean(DataSource.class);
        System.out.println(dataSource.getConnection());
    }





    /**
     * 獲取單個列的值, 或做統計查詢
     * 使用 queryForObject(String sql, Class<Long> requiredType)
     */
    @Test
    public void testQueryForObject2(){
        String sql = "SELECT count(open_id) FROM user";
        long count = jdbcTemplate.queryForObject(sql, Long.class);
        System.out.println(count);
    }




    /**
     * 查到實體類的集合
     * 注意調用的不是 queryForList 方法
     */
    @Test
    public void testQueryForList(){
        String sql = "SELECT open_id, age, province,sex FROM user WHERE open_id =  ?";
        RowMapper<User> rowMapper = new BeanPropertyRowMapper<>(User.class);
        List<User> employees = jdbcTemplate.query(sql, rowMapper,"oKXAc5LwmzeezIJp9vnBctUBgIMQ");
        System.out.println(employees);
        System.out.println(employees.get(0).getOpenId());
    }



    /**
     * 從數據庫中獲取一條記錄, 實際得到對應的一個對象
     * 注意不是調用 queryForObject(String sql, Class<Employee> requiredType, Object... args) 方法!
     * 而需要調用 queryForObject(String sql, RowMapper<Employee> rowMapper, Object... args)
     * 1. 其中的 RowMapper 指定如何去映射結果集的行, 常用的實現類爲 BeanPropertyRowMapper
     * 2. 使用 SQL 中列的別名完成列名和類的屬性名的映射. 例如 last_name lastName
     * 3. 不支持級聯屬性. JdbcTemplate 到底是一個 JDBC 的小工具, 而不是 ORM 框架
     */
    @Test
    public void testQueryForObject(){
        String sql = "SELECT OPEN_ID, AGE , PROVINCE, SEX  FROM USER WHERE open_id = ?";
        RowMapper<User> rowMapper = new BeanPropertyRowMapper<>(User.class);//多態
        User user =  jdbcTemplate.queryForObject(sql, rowMapper,"oKXAc5LwmzeezIJp9vnBctUBgIMQ");

        System.out.println(user);
    }



    /**
     * 執行批量更新: 批量的 INSERT, UPDATE, DELETE
     * 最後一個參數是 Object[] 的 List 類型: 因爲修改一條記錄需要一個 Object 的數組, 那麼多條不就需要多個 Object 的數組嗎
     */
    @Test
    public void testBatchUpdate(){
        String sql = "INSERT INTO user(open_id, age, province) VALUES(?,?,?)";

        List<Object[]> batchArgs = new ArrayList<>();

        batchArgs.add(new Object[]{"11", 22, "山東"});
        batchArgs.add(new Object[]{"22", 33, "江蘇"});


        jdbcTemplate.batchUpdate(sql, batchArgs);
    }


    /**
     * 執行 INSERT, UPDATE, DELETE
     */
    @Test
    public void testUpdate(){
        String sql = "UPDATE user SET age = ? WHERE open_id = ?";
        jdbcTemplate.update(sql, 4, "11");
    }



}