JdbcTemplate 简单实践一 （CURD试水-XML配置)

1.1 Maven配置 pom.xml

<?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>org.example</groupId>
    <artifactId>spring_jdbc</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.5.4</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.3</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
        </dependency>
    </dependencies>
</project>

 

1.2 编写dao

package cn.spring.domain;

public class Account {

    private int id;

    private String name;

    private double balance;

    public void Account() {}

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getBalance() {
        return balance;
    }

    public void setBalance(Double balance) {
        this.balance = balance;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", balance=" + balance +
                '}';
    }
}

 

1.3 jdbc.properties

jdbc.drvier=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?serverTimezone=UTC&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=root

 

1.4  applicationContext

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--加载jdbc.properties-->
    <context:property-placeholder location="jdbc.properties"/>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.drvier}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>
</beans>

 

1.5 编写测试类

 

package cn.spring.test;


import cn.spring.domain.Account;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class JdbcTemplateTest {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 1) execute方法：可以用于执行任何SQL语句，因为没有返回值一般用于执行DDL语句；
     *
     * 2) update方法及batchUpdate方法：
     *  update方法用于执行新增、修改、删除等语句；
     *  batchUpdate方法用于执行批处理相关语句；
     *
     * 3) query方法及queryForXXX方法：用于执行查询相关语句；
     *  JdbcTemplate查询-RowMapper返回自定义对象
     *  JdbcTemplate查询-BeanPropertyRowMapper返回自定义对象
     *
     * 4) call方法：用于执行存储过程、函数相关语句。
     *
     */


    @Test
    public void testCreateTable() {
        /**
         * execute
         */
        String sql = "CREATE TABLE account("
                + "id INT PRIMARY KEY AUTO_INCREMENT,"
                + "name VARCHAR(40) NOT NULL,"
                + "balance DOUBLE NOT NULL DEFAULT 0"
                + ")ENGINE=INNODB DEFAULT CHARSET=UTF8 AUTO_INCREMENT=1";
        System.out.println(sql);
        jdbcTemplate.execute(sql);
    }

    @Test
    public void testQueryOne() {
        /**
         * 1) queryForObject
         * 2) JdbcTemplate查询-BeanPropertyRowMapper返回自定义对象
         */
        String sql = "SELECT * FROM account WHERE name=? LIMIT 1 ";
        final Account account = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<Account>(Account.class), "lele");
        System.out.println(account);

        /**
         * 3) queryForMap
         */
        Map<String, Object> accountMap = jdbcTemplate.queryForMap(sql,"lele");
        System.out.println(accountMap);
    }

    @Test
    public void testQueryAll() {
        String sql = "SELECT * FROM account";
        /**
         * 1) query
         * 2) JdbcTemplate查询-BeanPropertyRowMapper返回自定义对象
         */
        List<Account> accountList = jdbcTemplate.query(sql, new BeanPropertyRowMapper<Account>(Account.class));
        for (Account account : accountList){
            System.out.println(account);
        }

        /**
         * 3) queryForList
         */
        List<Map<String, Object>> maps = jdbcTemplate.queryForList(sql);
        for (Map<String,Object> map : maps){
            System.out.println(map);
        }

        /**
         * 4) JdbcTemplate查询-RowMapper返回自定义对象
         */
        List<Account> accountRowMapper = jdbcTemplate.query(sql, new RowMapper<Account>() {
            public Account mapRow(ResultSet resultSet, int i) throws SQLException {
                Account account = new Account();
                account.setId(resultSet.getInt("id"));
                account.setName(resultSet.getString("name"));
                account.setBalance(resultSet.getDouble("balance"));
                return account;
            }
        });
        for (Account account : accountRowMapper){
            System.out.println(account);
        }
    }

    @Test
    public void testQueryCount() {
        String sql = "SELECT COUNT(1) FROM account";
        Long aLong = jdbcTemplate.queryForObject(sql, Long.class);
         System.out.println(aLong);
    }

    @Test
    public void testInsert() {
        String sql = "INSERT INTO account (name,balance) VALUES (?,?)";
        int lele = jdbcTemplate.update(sql, "leon", 1197);
        System.out.println(lele);
    }

    @Test
    public void TestUpdate() {
        String sql = "UPDATE account SET balance=? WHERE name=?";
        int lele = jdbcTemplate.update(sql, 5000, "lele");
        System.out.println(lele);
    }

    @Test
    public void testDelete() {
        String sql = "DELETE FROM account WHERE name=?";
        int lele = jdbcTemplate.update(sql, "lele");
        System.out.println(lele);
    }

    @Test
    public void testBatchUpdate() {

    }
}