Spring4使用JdbcTemplate来访问数据库,并记录一下简单增删改查操作。
创建数据库连接的参数配置文件 jdbc.properties文件，classpath路径下conf/datasource目录下配置如下
jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://127.0.0.1:3306/lian?autoReconnect=true&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false jdbc.username=root jdbc.password=root
Spring配置文件添加配置
<?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">
<!-- 使用spring注解 -->
<!-- <context:annotation-config/> -->
<!-- 下面的配置告诉spring容器自动scanner用注解标注bean -->
<context:component-scan base-package="org.lian"/>
<!--配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
<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>
<context:property-placeholder location="/conf/datasource/jdbc.properties"/>
</beans>
安装jar包，需要引入Spring-jdbc.jar和Spring-tx.jar此外需要引入apache的两个jar包已经上传。
配置准备工作完毕后就可以编写Java代码来使用JdbcTemplate。
两种使用方式放在两个不同的实现类中具体代码见下
@Repository("musicDao")
public class MusicDaoImpl implements MusicDao {
private JdbcTemplate jdbcTemplate;
@Autowired
public void setDataSource(DataSource dataSource) {
this.jdbcTemplate = new JdbcTemplate(dataSource);
}
@Override
public String get(Music music) {
/**
* select name,singer,author,composer,album,duration,style from t_music
*/
StringBuilder sql = new StringBuilder();
sql.append("select id, name,singer,author,composer,album,duration,style ");
sql.append("from t_music ");
sql.append("where id=? ");
Music bean = (Music) jdbcTemplate.queryForObject(sql.toString(),
new String[] { music.getId() }, new MusicMapper());
Gson gson = new Gson();
return gson.toJson(bean);
}
private static final class MusicMapper implements RowMapper<Music> {
@Override
public Music mapRow(ResultSet rs, int rowNum) throws SQLException {
Music music = new Music();
music.setName(rs.getString("name"));
music.setSinger(rs.getString("singer"));
music.setAlbum(rs.getString("album"));
music.setAuthor(rs.getString("author"));
music.setComposer(rs.getString("composer"));
music.setDuration(rs.getString("duration"));
music.setId(rs.getString("id"));
return music;
}
}
/**
*
* @description TODO
* @return
*/
@Override
public int count(Music music) {
String sql = "select count(1) from t_music where name=?";
int count = this.jdbcTemplate.queryForObject(sql, Integer.class,
music.getName());
// 两个方式都可以
// this.jdbcTemplate.queryForObject(sql, new String[] { music.getName() },
// Integer.class);
return count;
}
/**
*
* @description TODO 查询列表
* @param music
* @return
*/
@Override
public String list(Music music) {
/**
* 采用匿名内部类
*/
StringBuilder sql = new StringBuilder();
sql.append("select id,name,singer,author,composer,album,duration,style ");
sql.append("from t_music ");
sql.append("where name=?");
List<Music> list = this.jdbcTemplate.query(sql.toString(),
new String[] { music.getName() }, new RowMapper<Music>() {
@Override
public Music mapRow(ResultSet rs, int rowNum) throws SQLException {
Music music = new Music();
music.setName(rs.getString("name"));
music.setSinger(rs.getString("singer"));
music.setAlbum(rs.getString("album"));
music.setAuthor(rs.getString("author"));
music.setComposer(rs.getString("composer"));
music.setDuration(rs.getString("duration"));
music.setId(rs.getString("id"));
return music;
}
});
Gson gson = new Gson();
return gson.toJson(list);
}
@Override
public void update(Music music) {
/**
* update t_music set name='1232',singer='',author='',composer='', album='',
* duration='', style='' where id='12'
*/
StringBuilder sql = new StringBuilder();
sql.append("update t_music set name=? , singer=? , author=? , composer=? , ");
sql.append("album= ? , duration=? , style=? ");
sql.append("where id= ? ");
Object[] params = new Object[] { music.getName(), music.getSinger(),
music.getAuthor(), music.getComposer(), music.getAlbum(),
music.getDuration(), music.getStyle(), music.getId() };
this.jdbcTemplate.update(sql.toString(), params);
}
@Override
public void add(Music music) {
// TODO Auto-generated method stub
/**
* insert into t_music (id,name,singer,author,composer,album,duration,style)
* values('123','Wonderful U','AGA','AGA','AGA','Ginadoll','04:08','慢摇')
*/
Object[] params = new Object[] { music.getId(), music.getName(),
music.getSinger(), music.getAuthor(), music.getComposer(),
music.getAlbum(), music.getDuration(), music.getStyle() };
StringBuilder sql = new StringBuilder();
sql.append("insert into t_music ");
sql.append("(id,name,singer,author,composer,album,duration,style) ");
sql.append("values(?,?,?,?,?,?,?,?)");
this.jdbcTemplate.update(sql.toString(), params);
}
@Override
public void delete(Music music) {
String sql = "delete from t_music where id=? ";
this.jdbcTemplate.update(sql, music.getId());
}
}
@Repository("musicManagerDao")
public class MusicManagerDaoImpl implements MusicDao {
private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
@Autowired
public void setDataSource(DataSource dataSource) {
this.namedParameterJdbcTemplate = new NamedParameterJdbcTemplate(dataSource);
}
@Override
public String get(Music music) {
// TODO Auto-generated method stub
StringBuilder sql = new StringBuilder();
sql.append("select id, name,singer,author,composer,album,duration,style ");
sql.append("from t_music ");
sql.append("where id=:id ");
// 一旦创建的map不能被修改
Map<String, String> namedParameters = Collections.singletonMap("id",
music.getId());
Music bean = this.namedParameterJdbcTemplate.queryForObject(sql.toString(),
namedParameters, new RowMapper<Music>() {
@Override
public Music mapRow(ResultSet rs, int rowNum) throws SQLException {
Music music = new Music();
music.setName(rs.getString("name"));
music.setSinger(rs.getString("singer"));
music.setAlbum(rs.getString("album"));
music.setAuthor(rs.getString("author"));
music.setComposer(rs.getString("composer"));
music.setDuration(rs.getString("duration"));
music.setId(rs.getString("id"));
return music;
}
});
Gson gson = new Gson();
return gson.toJson(bean);
}
@Override
public int count(Music music) {
// TODO Auto-generated method stub
System.out.println(" MusicManagerDaoImpl.count() ");
/**
* select count(1) from t_music where name='红色高跟鞋'
*/
String sql = "select count(1) from t_music where name=:name";
Map<String, String> params = new HashMap<String, String>();
params.put("name", music.getName());
SqlParameterSource namedParameters = new MapSqlParameterSource(params);
// SqlParameterSource namedParameters = new MapSqlParameterSource("name",
// music.getName());
return this.namedParameterJdbcTemplate.queryForObject(sql, namedParameters,
Integer.class);
}
@Override
public String list(Music music) {
// TODO Auto-generated method stub
StringBuilder sql = new StringBuilder();
sql.append("select id,name,singer,author,composer,album,duration,style ");
sql.append("from t_music ");
sql.append("where name=:name");
/**
* :name 要与参数类属性保持一致
*/
SqlParameterSource namedParameters = new BeanPropertySqlParameterSource(
music);
List<Music> list = this.namedParameterJdbcTemplate.query(sql.toString(),
namedParameters, new RowMapper<Music>() {
@Override
public Music mapRow(ResultSet rs, int rowNum) throws SQLException {
Music music = new Music();
music.setName(rs.getString("name"));
music.setSinger(rs.getString("singer"));
music.setAlbum(rs.getString("album"));
music.setAuthor(rs.getString("author"));
music.setComposer(rs.getString("composer"));
music.setDuration(rs.getString("duration"));
music.setId(rs.getString("id"));
return music;
}
});
Gson gson = new Gson();
return gson.toJson(list);
}
@Override
public void update(Music music) {
// TODO Auto-generated method stub
}
@Override
public void add(Music music) {
// TODO Auto-generated method stub
}
@Override
public void delete(Music music) {
// TODO Auto-generated method stub
}
public static void main(String[] args) {
}
}
如果需要深入JdbcTemplate，可以参考SpringAPI