Spring的JDBC的模板使用
Spring的JDBC的模板使用
一、原始方法使用Spring的JDBC的模板
新建maven项目导入pom
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<maven.compiler.source>1.8maven.compiler.source>
<maven.compiler.target>1.8maven.compiler.target>
<spring.version>4.3.18.RELEASEspring.version>
<mysql.version>5.1.8mysql.version>
properties>
<dependencies>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
<scope>testscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-coreartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-beansartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-expressionartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-testartifactId>
<version>${spring.version}version>
<scope>compilescope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-txartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>${mysql.version}version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-aopartifactId>
<version>${spring.version}version>
dependency>
<dependency>
<groupId>log4jgroupId>
<artifactId>log4jartifactId>
<version>1.2.17version>
dependency>
<dependency>
<groupId>commons-logginggroupId>
<artifactId>commons-loggingartifactId>
<version>1.2version>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
<scope>compilescope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-testartifactId>
<version>${spring.version}version>
<scope>compilescope>
dependency>
dependencies>
- 创建数据库和表
CREATE TABLE `account` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(20) COLLATE utf8mb4_bin DEFAULT NULL,
`money` double DEFAULT NULL,
PRIMARY KEY (`id`)
)
log4j.properties 文件
### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c\:springdemo07.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### set log levels - for more verbose logging change 'info' to 'debug' ###
# error warn info debug trace
log4j.rootLogger= info, stdout,file
- 编写测试方法
public class JdbcDemo01 {
@Test
public void demo01(){
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql:///springdemo07");
dataSource.setUsername("root");
dataSource.setPassword("mysql");
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
jdbcTemplate.update("insert into account value (null,?,?)","余永涛",10000d);
}
}
二、将连接池和模板交给Spring管理
- 引入spring的配置文件applicationContext.xml
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///springdemo07"/>
<property name="username" value="root"/>
<property name="password" value="mysql"/>
bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
bean>
- 使用JDBC模板
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class JdbcDemo02 {
@Resource(name = "jdbcTemplate")
private JdbcTemplate jdbcTemplate;
@Test
public void demo02() {
jdbcTemplate.update("insert into account value (null,?,?)", "张三", 10000d);
}
}
三、开源连接池的使用
- DBCP
- 引入DBCP相关pom
<dependency>
<groupId>commons-dbcpgroupId>
<artifactId>commons-dbcpartifactId>
<version>1.3version>
dependency>
<dependency>
<groupId>commons-poolgroupId>
<artifactId>commons-poolartifactId>
<version>1.5.4version>
dependency>
- DBCP applicationContext.xml配置
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///springdemo07"/>
<property name="username" value="root"/>
<property name="password" value="mysql"/>
bean>
- 运行测试
- C3P0的使用
- 引入C3P0 pom
<dependency>
<groupId>com.mchangegroupId>
<artifactId>c3p0artifactId>
<version>0.9.5.2version>
dependency>
- C3P0 applicationContext.xml配置
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
<property name="jdbcUrl" value="jdbc:mysql:///springdemo07"/>
<property name="user" value="root"/>
<property name="password" value="mysql"/>
bean>
- 运行测试
- Druid
- 引入Druid pom
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.1.10version>
dependency>
- Druid applicationContext.xml配置
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///springdemo07"/>
<property name="username" value="root"/>
<property name="password" value="mysql"/>
bean>
- 运行测试
- 抽取连接池配置到属性文件
- classpath下新建文件jdbc.properties
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///springdemo07
jdbc.username=root
jdbc.password=mysql
- 在spring配置文件中引入属性文件
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties"/>
bean>
<context:property-placeholder location="classpath:jdbc.properties"/>
- 属性文件的使用 如在druid连接池配置中使用
${key}
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
bean>
四、使用JDBC模板进行CRUD操作
- 实体对象 Account
public class Account {
private Integer id;
private String name;
private Double money;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getMoney() {
return money;
}
public void setMoney(Double money) {
this.money = money;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
- 测试
import org.junit.Test;
import org.junit.runner.RunWith;
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 javax.annotation.Resource;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
/**
* @ClassName JdbcDemo03
* @Description TODO
* @Author greatDistance
* @Date 2019/6/4 20:44
* @Version 1.0
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class JdbcDemo03 {
@Resource(name = "jdbcTemplate")
private JdbcTemplate jdbcTemplate;
/**
* 增
*/
@Test
public void testSave() {
jdbcTemplate.update("insert into account value (null,?,?)", "如花1", 10000d);
}
/**
* 修改
*/
@Test
public void testUpdate() {
jdbcTemplate.update("update account set name=?,money=? where id =?", "修改如花", 8000d, 1);
}
/**
* 删除
*/
@Test
public void testDelete() {
jdbcTemplate.update("delete from account where id=?", 1);
}
/**
* 查询单个
*/
@Test
public void testQuery() {
String name = jdbcTemplate.queryForObject("select name from account where id = ?", String.class, 1);
Long count = jdbcTemplate.queryForObject("select count(*) from account", Long.class);
System.out.println("name = " + name);
System.out.println("count = " + count);
}
/**
* 封装一个结果集
*/
class MyRowMapper implements RowMapper<Account> {
@Override
public Account mapRow(ResultSet rs, int rowNum) throws SQLException {
Account account = new Account();
account.setId(rs.getInt("id"));
account.setName(rs.getString("name"));
account.setMoney(rs.getDouble("money"));
return account;
}
}
/**
* 查询所有属性
* 封装到一个对象中
*/
@Test
public void testQueryObject(){
Account account = jdbcTemplate.queryForObject("select * from account where id = ?", new MyRowMapper(), 1);
System.out.println(account);
}
/**
* 查询多条记录
*/
@Test
public void testQueryObjectList(){
List<Account> list = jdbcTemplate.query("select * from account", new MyRowMapper());
for (Account account : list) {
System.out.println(account);
}
}
}