JdbcTemplate系列(二)----实战CRUD
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第一步:创建Maven
eclipse新建Mavne选择Maven Project项目
选择Maven-archetype-webapp
输入Group id和Artifact id
输入好之后,点击Finsh,项目创建如下
查看index.jsp文件
发现报servlet错,这是由于缺少servlet.api所导致的,在pom.xml加入引用就可以了。
第二步:编辑POM文件
然后项目右键"Build path"选择ALLow output...
会发现项目多出来了几个目录,如下:
在pom.xml文件中加入以下内容:
<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.fendo.com</groupId> <artifactId>JDBC</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>JDBC Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <spring-version>4.1.2.RELEASE</spring-version> <commons.version>1.4</commons.version> <c3p0.version>0.9.1.2</c3p0.version> <log4j.version>1.2.17</log4j.version> <servlet.api.version>2.5</servlet.api.version> <jstl.version>1.2</jstl.version> <jsp.api.version>2.1</jsp.api.version> </properties> <dependencies><!-- https://mvnrepository.com/artifact/junit/junit --><dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version></dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>${commons.version}</version> </dependency> <!-- SPRING JDBC --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>${c3p0.version}</version> </dependency> <dependency> <groupId>javax.transaction</groupId> <artifactId>transaction-api</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.34</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.7.4</version> </dependency> <!-- jsp/servlet support --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>${servlet.api.version}</version> <type>jar</type> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>${jstl.version}</version> <type>jar</type> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>${jsp.api.version}</version> <type>jar</type></dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <!-- SPRING JDBC --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring-version}</version> </dependency> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>${c3p0.version}</version> </dependency> <dependency> <groupId>javax.transaction</groupId> <artifactId>transaction-api</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.34</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.7.4</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> </dependency> </dependencies> <build> <finalName>JDBC</finalName> </build></project>第三步:编辑web.xml、jdbc.properties、appliactionContext.xml文件
修改web.xml如下:
<?xml version="1.0" encoding="UTF-8"?><web-app> <display-name>Archetype Created Web Application</display-name> <listener> <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class> </listener> <servlet> <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:*appliactionContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <filter> <filter-name>setCharacter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>setCharacter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
在src\main\resources下面新建一个属性配置文件: jdbc.properties
jdbc.user=rootjdbc.password=rootjdbc.driverClass=com.mysql.jdbc.Driverjdbc.jdbcUrl=jdbc:mysql://127.0.0.1:3306/jdbcjdbc.initPoolSize=5jdbc.maxPoolSize=10
新建Spring配置文件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"xmlns:context="http://www.springframework.org/schema/context"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd"> <!-- 基于注解的，导入标识的包,可以识别本包，或其自包,其只对带有指定注解的类，方法有效，不是对这个包中的所有类和方法有效 --> <context:component-scan base-package="com.fendo.dao"></context:component-scan><context:property-placeholder location="classpath:jdbc.properties"/> <!-- 配置c3p0数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> <property name="driverClass" value="${jdbc.driverClass}"></property> <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property> <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property> </bean> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> <bean id="userDao" class="com.fendo.impl.UserDaoImpl"> <property name="jdbcTemplate" ref="jdbcTemplate"></property> </bean> <!-- 配置NamedParameterJdbcTemplate,该对象可以使用具名参数，其没有无参的构造器，所以必须为其构造器指定参数 --> <bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate"> <constructor-arg ref="dataSource"></constructor-arg> </bean></beans>新建好之后如下:
第四步:新建实体类与测试方法
对应的SQL文件为:
CREATE TABLE `student` ( `sid` int(11) NOT NULL AUTO_INCREMENT, `sname` varchar(255) DEFAULT NULL, `sage` varchar(255) DEFAULT NULL, `ssex` varchar(255) DEFAULT NULL, PRIMARY KEY (`sid`)) ENGINE=InnoDB AUTO_INCREMENT=44 DEFAULT CHARSET=utf8;
新建UserDao类:
package com.fendo.dao;import java.util.List;import com.fendo.entity.User;public interface UserDao { public void addUser(User user); public void deleteUser(int id); public void updateUser(User user); public String searchUserName(int id); public User searchUser(int id); public List<User> findAll();}建立类：UserDaoAnnotation，基于注解的查询方法
package com.fendo.dao;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.stereotype.Component;import com.fendo.entity.User;@Component//基本注解public class UserDaoAnnotation { @Autowired public JdbcTemplate jdbcTemplate; public User get(Integer sid){ String sql="select sid,sname,ssex from student where sid=?"; RowMapper<User> rowMapper=new BeanPropertyRowMapper<User>(User.class); User user=jdbcTemplate.queryForObject(sql, rowMapper, sid); return user; }}package com.fendo.dao;import java.sql.ResultSet;import java.sql.SQLException;import org.springframework.jdbc.core.RowMapper;import com.fendo.entity.User;public class UserRowMapper implements RowMapper<User>{public User mapRow(ResultSet rs, int rowNum) throws SQLException { // rs 已经指向每一条数据，不需要自己调用 next，将rs指向数据 转换 User对象User user = new User();user.setSid(rs.getString("sid"));user.setSname(rs.getString("sname"));return user;}}创建User实体类:
package com.fendo.entity;public class User {private String sid;private String sname;private String sage;private String ssex;public String getSid() {return sid;}public void setSid(String sid) {this.sid = sid;}public String getSname() {return sname;}public void setSname(String sname) {this.sname = sname;}public String getSage() {return sage;}public void setSage(String sage) {this.sage = sage;}public String getSsex() {return ssex;}public void setSsex(String ssex) {this.ssex = ssex;}}创建实现类:
package com.fendo.impl;import java.util.List;import org.springframework.jdbc.core.RowMapper;import org.springframework.jdbc.core.support.JdbcDaoSupport;import com.fendo.dao.UserDao;import com.fendo.dao.UserRowMapper;import com.fendo.entity.User;public class UserDaoImpl extends JdbcDaoSupport implements UserDao{public void addUser(User user) { String sql = "insert into student values(?,?,?,?)"; this.getJdbcTemplate().update(sql, user.getSid(), user.getSname(), user.getSage(),user.getSsex()); } public void deleteUser(int id) { String sql = "delete from student where sid=?"; this.getJdbcTemplate().update(sql, id); } public void updateUser(User user) { String sql = "update student set sname=?,sage=? where sid=?"; this.getJdbcTemplate().update(sql, user.getSname(), user.getSage(), user.getSid()); } public String searchUserName(int sid) {// 简单查询，按照ID查询，返回字符串 String sql = "select sname from student where sid=?"; // 返回类型为String(String.class) return this.getJdbcTemplate().queryForObject(sql, String.class, sid); } public List<User> findAll() {// 复杂查询返回List集合 String sql = "select * from student"; return this.getJdbcTemplate().query(sql, new UserRowMapper()); } public User searchUser(int id) { String sql="select * from student where sid=?"; return this.getJdbcTemplate().queryForObject(sql, new UserRowMapper(), id); }}测试类1:
package com.fendo.test;import java.util.List;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.fendo.dao.UserDao;import com.fendo.entity.User;public class Temp {@Test//增 public void demo1(){ User user=new User(); user.setSid("3"); user.setSname("admin"); user.setSage("18"); ApplicationContext applicationContext=new ClassPathXmlApplicationContext("appliactionContext.xml"); UserDao dao=(UserDao) applicationContext.getBean("userDao"); dao.addUser(user); } @Test//改 public void demo2(){ User user=new User(); user.setSid("3"); user.setSname("fendo"); user.setSage("18"); ApplicationContext applicationContext=new ClassPathXmlApplicationContext("appliactionContext.xml"); UserDao dao=(UserDao) applicationContext.getBean("userDao"); dao.updateUser(user); } @Test//删 public void demo3(){ ApplicationContext applicationContext=new ClassPathXmlApplicationContext("appliactionContext.xml"); UserDao dao=(UserDao) applicationContext.getBean("userDao"); dao.deleteUser(3); } @Test//查（简单查询，返回字符串） public void demo4(){ ApplicationContext applicationContext=new ClassPathXmlApplicationContext("appliactionContext.xml"); UserDao dao=(UserDao) applicationContext.getBean("userDao"); String name=dao.searchUserName(3); System.out.println(name); } @Test//查（简单查询，返回对象） public void demo5(){ ApplicationContext applicationContext=new ClassPathXmlApplicationContext("appliactionContext.xml"); UserDao dao=(UserDao) applicationContext.getBean("userDao"); User user=dao.searchUser(3); System.out.println(user.getSname()); } @Test//查（复杂查询，返回对象集合） public void demo6(){ ApplicationContext applicationContext=new ClassPathXmlApplicationContext("appliactionContext.xml"); UserDao dao=(UserDao) applicationContext.getBean("userDao"); List<User> users=dao.findAll(); System.out.println(users.size()); }}测试类2:
package com.fendo.test;import java.sql.SQLException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.sql.DataSource;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 com.fendo.dao.UserDao;import com.fendo.dao.UserDaoAnnotation;import com.fendo.entity.User;import com.fendo.impl.UserDaoImpl;public class Temp1 { private ApplicationContext ctx=null; private JdbcTemplate jdbcTemplate; private UserDaoAnnotation userDaoAnnotation; private NamedParameterJdbcTemplate namedParameterJdbcTemplate; { ctx=new ClassPathXmlApplicationContext("appliactionContext.xml"); jdbcTemplate=(JdbcTemplate)ctx.getBean("jdbcTemplate"); userDaoAnnotation=ctx.getBean(UserDaoAnnotation.class); namedParameterJdbcTemplate=ctx.getBean(NamedParameterJdbcTemplate.class); } /** * 使用具名参数时, 可以使用 update(String sql, SqlParameterSource paramSource) 方法进行更新操作 * 1. SQL 语句中的参数名和类的属性一致!即上边employee中属性一致 * 2. 使用 SqlParameterSource 的 BeanPropertySqlParameterSource 实现类作为参数. */ @Test public void testNamedParameterJdbcTemplate2(){ String sql="insert into student(sname,sage,ssex) values(:sname,:sage,:ssex)"; User user=new User();user.setSname("fendo");user.setSage("18");user.setSsex("男");SqlParameterSource paramSource=new BeanPropertySqlParameterSource(user);namedParameterJdbcTemplate.update(sql,paramSource); } //可以为参数起名字//好处: 若有多个参数, 则不用再去对应位置, 直接对应参数名, 便于维护//缺点: 较为麻烦. @Testpublic void testNamedParameterJdbcTemplate(){String sql="insert into student(sname,sage,ssex) values(:sname,:sage,:ssex)";Map<String, Object> paramMap=new HashMap();paramMap.put("sname", "fendo");paramMap.put("sage", "18");paramMap.put("ssex", "男");namedParameterJdbcTemplate.update(sql, paramMap);} //对基于注解的方法测试 @Test public void tesUserDao(){ System.out.println(userDaoAnnotation.get(2)); } //获取单个列的值, 或做统计查询 //使用 queryForObject(String sql, Class<Long> requiredType) @Test public void testQueryForObject2(){ String sql="select count(sid) from student"; long count=jdbcTemplate.queryForObject(sql, Long.class); System.out.println(count); } //查到实体类的集合 //注意调用的不是 queryForList 方法 @Test public void testQueryForList(){ String sql="select sid,sname,sage from student where sid>?"; RowMapper<User> rowMapper=new BeanPropertyRowMapper<User>(User.class); List<User> user=jdbcTemplate.query(sql, rowMapper, 1); System.out.println(user); } /** * 从数据库中获取一条记录, 实际得到对应的一个对象 * 注意不是调用 queryForObject(String sql, Class<Employee> requiredType, Object... args) 方法! * 而需要调用 queryForObject(String sql, RowMapper<Employee> rowMapper, Object... args) * 1. 其中的 RowMapper 指定如何去映射结果集的行, 常用的实现类为 BeanPropertyRowMapper * 2. 使用 SQL 中列的别名完成列名和类的属性名的映射. 例如 last_name lastName * 3. 不支持级联属性. JdbcTemplate 到底是一个 JDBC 的小工具, 而不是 ORM 框架 */ @Test public void testQueryForObject(){ // String sql="select id,last_name lastName,email,dept_id as \"department.id\" from tables where id=?"; String sql="select sid,sname,sage,ssex as \"department.sex\" from student where sid=?"; RowMapper<User> rowMapper=new BeanPropertyRowMapper<User>(User.class); User employee=jdbcTemplate.queryForObject(sql, rowMapper,1); System.out.println(employee); } //执行批量更新: 批量的 INSERT, UPDATE, DELETE //最后一个参数是 Object[] 的 List 类型: 因为修改一条记录需要一个 Object 的数组, //那么多条不就需要多个 Object 的数组 @Test public void testBatchUpdate(){ String sql="insert into student(sid,sname,sage) values(?,?,?)"; List<Object[]> batchArgs=new ArrayList<Object[]>(); batchArgs.add(new Object[]{"11","fendo","15"}); batchArgs.add(new Object[]{"21","ckse","16"}); batchArgs.add(new Object[]{"31","gogo","17"}); batchArgs.add(new Object[]{"41","asde","18"}); jdbcTemplate.batchUpdate(sql,batchArgs); } //执行 INSERT, UPDATE, DELETE，只修改sql语句，即可 @Test public void testUpdate(){ String sql="update student set sname=? where sid=?"; jdbcTemplate.update(sql, "权", "1"); } //测试数据库连接池是否连接成功 @Test public void testDataSource() throws SQLException { DataSource dataSource=ctx.getBean(DataSource.class); System.out.println(dataSource.getConnection()); }}完整示例: http://download.csdn.net/detail/u011781521/9849263
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