【转】使用Spring的NamedParameterJdbcTemplate完成DAO操作
NamedParameterJdbcTemplate内部包含了一个JdbcTemplate，所以JdbcTemplate能做的事情NamedParameterJdbcTemplate都能干，NamedParameterJdbcTemplate相对于JdbcTemplate主要增加了参数可以命名的功能。
public Object queryForObject(String sql, Map paramMap, RowMapper rowMapper)
public Object queryForObject(String sql, SqlParameterSource paramSource, RowMapper rowMapper)
???????SqlParameterSource的两个主要实现MapSqlParameterSource
???????和BeanPropertySqlParameterSource
public int update(String sql, SqlParameterSource paramSource, KeyHolder generatedKeyHolder)保存数据获得主键。?
实例说明：
/**
?*?一、NamedParameterJdbcTemplate提供了命名参数，用:x代替了?
?*?NamedParameterJdbcTemplate传参数可以用map或者SqlParameterSource
?*?用map的好处是:x,x的值可以自由取，但是所有参数的值都必须要放到map中去，其中的key为:后面的名称，value是你传的值
?*?用SqlParameterSource的好处是不用一个个的赋值,但是:x中的x的值必须和对象的属性名称一样
?
?*?二、使用KeyHolder keyholder=new?GeneratedKeyHolder();
???namedjdbctemp.update(sql, ps,keyholder);这个参数可以获得主键生成值
?*/
public?class?StuDaoImple?implements?StuDaointer{?
????private?NamedParameterJdbcTemplate?namedjdbctemp;
?
????public?StuDaoImple(){
???????namedjdbctemp=new?NamedParameterJdbcTemplate(SQLConnUtil.getDataSource());
????}// SQLConnUtil为JDBC工具类，提供了得到数据源的静态方法
????/*
?????*?这里会用到NamedParameterJdbcTemplate两个好处：
?????* 1，不用一个个的为参数赋值。
?????* 2，可以轻易的得到主键自动增长值
?????*/
????public?void?addStu(Stu stu) {
???????String sql="insert into stu values(:sname,:ssex,:sbrith)";
???????//:后面的名称必须和stu属性名称一样
???????SqlParameterSource ps=new?BeanPropertySqlParameterSource(stu);
???????KeyHolder keyholder=new?GeneratedKeyHolder();
???????namedjdbctemp.update(sql, ps,keyholder);
???????//加上KeyHolder这个参数可以得到添加后主键的值
???????int?m=keyholder.getKey().intValue();
???????System.out.println(m);
???????//Map map=keyholder.getKeys();//这样可以得到联合主键的值
???????//keyholder.getKeyList();//这样可以得到一些主主键值，若一次添加好几条记录
????}
????public?int?count() {
???????String sql="select count(*) from stu";
???????//可以通过NamedParameterJdbcTemplate得到JdbcTemplate
???????int?m=namedjdbctemp.getJdbcOperations().queryForInt(sql);
???????return?m;
????}
?
????/*
?????*?这里会用到NamedParameterJdbcTemplate另一个好处：
?????*?位置参数
?????*/
????public?void?delStu(int?sid) {
???????String sql="delete stu where s_id=:id";
???????Map map=new?HashMap();
???????map.put("id", sid);
???????namedjdbctemp.update(sql, map);
????}
????public?List getAllStu() {
???????String sql="select s_id as sid,s_name as sname,s_sex as ssex,s_brith as sbrith from stu";
???????List list=namedjdbctemp.getJdbcOperations().query(sql,new?BeanPropertyRowMapper(Stu.class));
???????return?list;
????}
????public?List getAllStu(Stu stu) {
???????String sql="select s_id as sid,s_name as sname,s_sex as ssex,s_brith as sbrith from stu where s_id=:sid";
???????SqlParameterSource ps=new?BeanPropertySqlParameterSource(stu);
???????return?namedjdbctemp.query(sql, ps,?new?BeanPropertyRowMapper(Stu.class));
????}
????public?Stu getOneStu(Stu stu) {
???????String sql="select s_id as sid,s_name as sname,s_sex as ssex,s_brith as sbrith from stu where s_id=:sid";
???????SqlParameterSource ps=new?BeanPropertySqlParameterSource(stu);
???????return?(Stu)namedjdbctemp.queryForObject(sql, ps,?new?BeanPropertyRowMapper(Stu.class));
????}
????public?String getStuName(Stu stu) {
???????String sql="select s_name as sname from stu where s_name=:sname";
???????SqlParameterSource ps=new?BeanPropertySqlParameterSource(stu);
???????return?(String)namedjdbctemp.queryForObject(sql, ps, String.class);
????}
????public?void?updStu(Stu stu) {
???????String sql="update stu set s_name=:sname,s_sex=:ssex,s_brith=:sbrith where s_id=:sid";
???????SqlParameterSource ps=new?BeanPropertySqlParameterSource(stu);
???????namedjdbctemp.update(sql, ps);
????}
}
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来自：http://hi.baidu.com/%C5%ED%BD%F0%BD%F0%BB%D4%BB%D4/blog/item/76e7ece269c2483fb9382051.html
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