ibatis 动态传入表名和列名
规格严格-功夫到家-哈工大威海人......博客园社区首页新随笔联系管理订阅 随笔- 138 文章- 2 评论- 10 (总结)ibatis 动态传入表名和列名 项目中需要根据不同的表名和列名生成不同的select语句,我想ibatis这里也应该是用预编译的形式存储????
不太了解具体原理,反正我知道在用oci库的时候,是可以的;用sprinf("sql","xx","xx"),一下,就可以了。oci库肯定是用预编译的形式干的!
于是,我上网查了查,感觉类似的问题有,可没给出一个完整的例子。想了一想,既然你能动态传入map,map里面存储了相应的查询值,那你
ibatis肯定也能传入其他元数据信息吧。测试了一下,可以!OK,搞定了:)
不多说了,代码如下
代码
1 Java code :
2 // just a releation to the table stored in db
3 public class Test {
4 public String name;
5 public Timestamp date;
6 public int id;
7 }
8 public class TestInsert {
9 // logger class you can replace it to System.out.println
10 static Log logger = LogFactory.getLog(TestInsert.class);
11
12 public static void main(String[] args) {
13 /*
14 * Test test = new Test(); test.date = new
15 * Timestamp(System.currentTimeMillis()); test.name = "fffff"; try {
16 * long num = (Long) EntityManager.getSqlMapper().insertArgs(
17 * "insertOperation", "fffff", new
18 * Timestamp(System.currentTimeMillis())); logger.info("ID is " + num);
19 * } catch (SQLException e) { e.printStackTrace(); }
20 */
21 // try the dynamic table dealation
22 HashMap<String, Object> map = new HashMap<String, Object>();
23 // set the query value
24 map.put("ID", "dizhuang");
25 // set the col1 to be selected
26 map.put("col1", "*");
// set the table name
27 map.put("tablePrefix", "testsocevent");
28 // set the col name which you use
map.put("col2", "NAME");
29 // map.put("ID", 1000);
30 // map.put("id", "1005");
31 try {
32 // why args is error?
33 Test test = (Test) EntityManager.getSqlMapper().queryForObject(
34 "getTest", map);
35 logger.info("id : " + test.id);
36 logger.info("time :" + test.date);
37 logger.info("name : " + test.name);
38 } catch (SQLException e) {
39 logger.error(e.getMessage(), e);
40 // e.printStackTrace();
41 }
42 }
43 }
// ibatis sql
<select id="getTest" parameterClass="java.util.HashMap"
resultClass="com.neusoft.soc.eventcenter.test.Test"
remapResults="true">
SELECT
$col1$
FROM
$tablePrefix$
WHERE
$col2$ = #ID#
</select>