1、首先導入包：
2、然后建立數據庫表 CREATE DATABASE day36;
USE day36;
CREATE TABLE t_user( id INT PRIMARY KEY, NAME VARCHAR(20), gender CHAR(2) );

3、在編寫實體 package?star.july.entity; public?class?User { ??????????private?int?id; ??????????private?String?name; ??????????private?String?gender; ??????????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?String getGender() { ???????????????????return?gender; ??????????} ??????????public?void?setGender(String gender) { ???????????????????this.gender?= gender; ??????????} ??????????@Override ??????????public?String toString() { ???????????????????return?"User [id="?+?id?+?", name="?+?name?+?", gender="?+?gender?+?"]"; ??????????} ?????????? } 4、編寫dao類 package?star.july.dao; import?java.util.List; import?star.july.entity.User; public?interface?IUserDao?{ ????public?void?save(User user); ????public?void?update(User user); ????public?void?delete(int?id); ????public?List<User>?queryAll(); ????public?List<User>?queryPages(int?curPage,int?PageSize); ????public?User queryById(int?id); ????public?int?queryCount(); }

dao類實現接口 package?star.july.dao; import?java.sql.ResultSet; import?java.sql.SQLException; import?java.util.List; import?org.springframework.jdbc.core.JdbcTemplate; import?org.springframework.jdbc.core.RowMapper; import?star.july.entity.User; public?class?UserDaoImpl?implements?IUserDao{ ????//用于接收jdbcTemplate對象 ????private?JdbcTemplate jdbcTemplate; ???? ???? ????public?void?setJdbcTemplate(JdbcTemplate jdbcTemplate)?{ ????????this.jdbcTemplate?=?jdbcTemplate; ????} ????//添加 ????public?void?save(User user)?{ ????????jdbcTemplate.update("insert into t_user(id,name,gender) values(?,?,?)", ????????????????user.getId(), ????????????????user.getName(), ????????????????user.getGender() ????????????????); ????} ????//修改 ????public?void?update(User user)?{ ????????jdbcTemplate.update("update t_user set name=?,gender=? where id=?", ????????????????user.getName(), ????????????????user.getGender(), ????????????????user.getId() ????????????????); ???????? ????} ????//刪除 ????public?void?delete(int?id)?{ ????????jdbcTemplate.update("delete from t_user where id=?",id); ???????? ????} ????//查詢所有數據 ????public?List<User>?queryAll()?{ ????????return?jdbcTemplate.query("select * from t_user",new?RowMapper( ????????????????)?{ ????????????public?Object mapRow(ResultSet rs,?int?index) ????????????????????throws?SQLException?{ ????????????????User u?=?new?User(); ????????????????u.setId(rs.getInt("id")); ????????????????u.setName(rs.getString("name")); ????????????????u.setGender(rs.getString("gender")); ????????????????return?u; ????????????} ????????????????} ????????????????); ????} ???? ???? ????//分頁查詢 ????public?List<User>?queryPages(int?curPage,int?pageSize)?{ ????????????return?(List<User>)jdbcTemplate.query("select * from t_user limit ? , ?",?new?RowMapper(){ ????????????????public?Object mapRow(ResultSet rs,?int?arg1) ????????????????????????throws?SQLException?{ ????????????????????User u?=?new?User(); ????????????????????u.setId(rs.getInt("id")); ????????????????????u.setName(rs.getString("name")); ????????????????????u.setGender(rs.getString("gender")); ????????????????????return?u; ????????????????} ????????????},(curPage-1)*pageSize,pageSize); ????} ????public?User queryById(int?id)?{ ????????return?jdbcTemplate.queryForObject("select * from t_user where id = ?",new?RowMapper(){ ????????????public?Object mapRow(ResultSet rs,?int?index)?throws?SQLException?{ ????????????????User u?=?new?User(); ????????????????u.setId(rs.getInt("id")); ????????????????u.setName(rs.getString("name")); ????????????????u.setGender(rs.getString("gender")); ????????????????return?u; ????????????} ????????},id); ????} ????//查詢總計錄數 ????public?int?queryCount()?{ ????????return?jdbcTemplate.queryForObject("select count(*) from t_user",?Long.class).intValue(); ????} ???? ???? }
5、編寫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.xsd"> ?????????? ??????????<!--? 1、創建連接池對象 --> ??????????<bean?id="dataSourceID"?class="com.mchange.v2.c3p0.ComboPooledDataSource"> ???????????????????<!-- 注入參數 --> ???????????????????<property?name="jdbcUrl"?value="jdbc:mysql://localhost:3306/day36"></property> ???????????????????<property?name="driverClass"?value="com.mysql.jdbc.Driver"></property> ???????????????????<property?name="user"?value="root"></property> ???????????????????<property?name="password"?value="root"></property> ??????????</bean> ?????????? ??????????<!-- 2、創建spring提供的JdbcTemplate模塊對象 --> ??????????<bean?id="jdbcTemplateID"?class="org.springframework.jdbc.core.JdbcTemplate"> ???????????????????<!-- 注入連接池對象 --> ???????????????????<property?name="dataSource"?ref="dataSourceID"></property> ??????????</bean> ?????????? ??????????<!-- 3、創建dao對象 --> ??????????<bean?id="userDaoID"?class="star.july.dao.UserDaoImpl"> ???????????????????<!-- 注入jdbcTemplate對象 --> ???????????????????<property?name="jdbcTemplate"?ref="jdbcTemplateID"></property> ??????????</bean> ?????????? ?????????? ??????? </beans>

6、測試 package?star.july.test; import?java.util.List; import?org.junit.Test; import?org.springframework.context.ApplicationContext; import?org.springframework.context.support.ClassPathXmlApplicationContext; import?star.july.dao.IUserDao; import?star.july.dao.UserDaoImpl; import?star.july.entity.User; public?class?Demo?{ ????//添加 ????@Test ????public?void?test(){ ????????ApplicationContext ac?=?new?ClassPathXmlApplicationContext("/applicationContext.xml"); ????????IUserDao userDao?=?(IUserDao)ac.getBean("userDaoID"); ????????User u?=?new?User(); ????????u.setId(3); ????????u.setName("徐渭熊"); ????????u.setGender("女"); ????????userDao.save(u); ????} ???? ???? ????//修改 ????@Test ????public?void?test2(){ ????????ApplicationContext ac?=?new?ClassPathXmlApplicationContext("/applicationContext.xml"); ????????IUserDao userDao?=?(IUserDao)ac.getBean("userDaoID"); ????????User u?=?new?User(); ????????u.setId(1); ????????u.setName("徐奇"); ????????u.setGender("男"); ????????userDao.update(u); ????} ????//刪除 ????@Test ????public?void?test3(){ ????????ApplicationContext ac?=?new?ClassPathXmlApplicationContext("/applicationContext.xml"); ????????IUserDao userDao?=?(IUserDao)ac.getBean("userDaoID"); ????????userDao.delete(2); ????} ????//查詢所有對象 ????@Test ????public?void?test4(){ ????????ApplicationContext ac?=?new?ClassPathXmlApplicationContext("/applicationContext.xml"); ????????IUserDao userDao?=?(IUserDao)ac.getBean("userDaoID"); ????????List<User>?list?=?userDao.queryAll(); ????????for(User u?:?list){ ????????????System.out.println(u); ????????} ????} ????//根據id查找對象 ????@Test ????public?void?test5(){ ????????ApplicationContext ac?=?new?ClassPathXmlApplicationContext("/applicationContext.xml"); ????????IUserDao userDao?=?(IUserDao)ac.getBean("userDaoID"); ????????User u?=?userDao.queryById(2); ????????System.out.println(u); ????????} ????//查找總計錄數 ????@Test ????public?void?test6(){ ????????ApplicationContext ac?=?new?ClassPathXmlApplicationContext("/applicationContext.xml"); ????????IUserDao userDao?=?(IUserDao)ac.getBean("userDaoID"); ????????int?count?=?userDao.queryCount(); ????????System.out.println(count); ????} ???? ????//分頁查詢 ????@Test ????public?void?test7(){ ????????ApplicationContext ac?=?new?ClassPathXmlApplicationContext("/applicationContext.xml"); ????????IUserDao userDao?=?(IUserDao)ac.getBean("userDaoID"); ????????List<User>?list?=?userDao.queryPages(2,?2); ????????for(User user?:?list?){ ????????????System.out.println(user); ????????} ????} }




抽取數據可的參數到properties文件，首先要配置context命名空間（紅色部分） 再配置全局讀取：??<context:property-placeholder?location="classpath:db.properties"/> 最后用表達式獲取值（黑色加粗部分)
<?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 ??????? http://www.springframework.org/schema/context/spring-context.xsd"> ??????????<context:property-placeholder?location="classpath:db.properties"/> ?????????? ??????????<!--? 1、創建連接池對象 --> ??????????<bean?id="dataSourceID"?class="com.mchange.v2.c3p0.ComboPooledDataSource"> ???????????????????<!-- 注入參數 --> ???????????????????<property?name="jdbcUrl"?value="${jdbcUrl}"></property> ???????????????????<property?name="driverClass"?value="${driverClass}"></property> ???????????????????<property?name="user"?value="${user}"></property> ???????????????????<property?name="password"?value="${password}"></property> ??????????</bean> ?????????? ??????????<!-- 2、創建spring提供的JdbcTemplate模塊對象 --> ??????????<bean?id="jdbcTemplateID"?class="org.springframework.jdbc.core.JdbcTemplate"> ???????????????????<!-- 注入連接池對象 --> ???????????????????<property?name="dataSource"?ref="dataSourceID"></property> ??????????</bean> ?????????? ??????????<!-- 3、創建dao對象 --> ??????????<bean?id="userDaoID"?class="star.july.dao.UserDaoImpl"> ???????????????????<!-- 注入jdbcTemplate對象 --> ???????????????????<property?name="jdbcTemplate"?ref="jdbcTemplateID"></property> ??????????</bean> ??????? </beans>

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