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MyBatis入门实例-包括实体类与数据库字段对应CLOB字段处理

發布時間：2024/9/20 数据库 24 豆豆

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1、我的開發環境是 jdk1.7+ecplise+oracle 11g

? ? ?用到的jar包：mybatis-3.1.1.jar?

ojdbc6.jar???? ? ?????

2、項目整體結構?

3、首先配置conf.xml文件

[html]?view plaincopy

<?xml?version="1.0"?encoding="UTF-8"?>??

<!DOCTYPE?configuration?PUBLIC?"-//mybatis.org//DTD?Config?3.0//EN"?"http://mybatis.org/dtd/mybatis-3-config.dtd">??

<configuration>??

????<environments?default="development">??

????????<environment?id="development">??

????????????<transactionManager?type="JDBC"?/>??

??????????????

????????????<dataSource?type="POOLED">??

????????????????<property?name="driver"?value="oracle.jdbc.driver.OracleDriver"?/>??

????????????????<property?name="url"?value="jdbc:oracle:thin:@xxx.xxx.xxx.xxx:1521:orcl"?/>??

????????????????<property?name="username"?value="xxx"?/>??

????????????????<property?name="password"?value="xxx"?/>??

????????????</dataSource>??

????????</environment>??

????</environments>??

</configuration>??

4、數據庫表創建

[sql]?view plaincopy

--?Create?table??

create?table?DIM_LANE_AREA??

(??

??lane_id???????NUMBER(4)?not?null,??

??lane_name?????VARCHAR2(100)?not?null,??

??direction?????CHAR(2)?not?null,??

??facility_list?CLOB?not?null,??

??account_list??CLOB?not?null,??

??description???VARCHAR2(100)??

)??

tablespace?USERS??

??pctfree?10??

??initrans?1??

??maxtrans?255??

??storage??

??(??

????initial?64K??

????next?1M??

????minextents?1??

????maxextents?unlimited??

??);??

--?Add?comments?to?the?columns???

comment?on?column?DIM_LANE_AREA.lane_id??

??is?'單行道編號';??

comment?on?column?DIM_LANE_AREA.lane_name??

??is?'單行道名稱';??

comment?on?column?DIM_LANE_AREA.direction??

??is?'單行道方向';??

comment?on?column?DIM_LANE_AREA.facility_list??

??is?'設備列表';??

comment?on?column?DIM_LANE_AREA.account_list??

??is?'賬戶列表';??

comment?on?column?DIM_LANE_AREA.description??

??is?'描述';??

--?Create/Recreate?indexes???

create?unique?index?DIM_LANE_AREA_1?on?DIM_LANE_AREA?(LANE_ID)??

??tablespace?USERS??

??pctfree?10??

??initrans?2??

??maxtrans?255??

??storage??

??(??

????initial?64K??

????next?8K??

????minextents?1??

????maxextents?unlimited??

??);??

create?index?DIM_LANE_AREA_2?on?DIM_LANE_AREA?(DIRECTION)??

??tablespace?USERS??

??pctfree?10??

??initrans?2??

??maxtrans?255??

??storage??

??(??

????initial?64K??

????next?8K??

????minextents?1??

????maxextents?unlimited??

??);??

--?Create/Recreate?primary,?unique?and?foreign?key?constraints???

alter?table?DIM_LANE_AREA??

??add?constraint?DIM_LANE_AREA?primary?key?(LANE_ID);??

5、編寫實體類LaneArea.java

[java]?view plaincopy

package?me.gacl.po;??

/**?

?*?單行道配置信息PO?

?*?@author?wqq?

?*?@time?2016-09-21?

?*/??

public?class?LaneArea???

{??

????/**?

?????*?單行道編號?

?????*/??

????private?Integer?laneId;??

??????

????/**?

?????*?單行道名稱?

?????*/??

????private?String?laneName;??

??????

????/**?

?????*?單行道方向?

?????*/??

????private?String?direction;??

??????

????/**?

?????*?設備列表<span?style="font-family:?Arial,?Helvetica,?sans-serif;">(該字段為CLOB類型，以逗號分隔)</span>?

?????*/??

????private?String?facilityList;??

??????

????/**?

?????*?賬戶列表(該字段為CLOB類型，以逗號分隔)?

?????*/??

????private?String?accountList;??

??????

????/**?

?????*?描述?

?????*/??

????private?String?description;??

????public?Integer?getLaneId()?{??

????????return?laneId;??

????}??

????public?void?setLaneId(Integer?laneId)?{??

????????this.laneId?=?laneId;??

????}??

????public?String?getLaneName()?{??

????????return?laneName;??

????}??

????public?void?setLaneName(String?laneName)?{??

????????this.laneName?=?laneName;??

????}??

????public?String?getDirection()?{??

????????return?direction;??

????}??

????public?void?setDirection(String?direction)?{??

????????this.direction?=?direction;??

????}??

????public?String?getFacilityList()?{??

????????return?facilityList;??

????}??

????public?void?setFacilityList(String?facilityList)?{??

????????this.facilityList?=?facilityList;??

????}??

????public?String?getAccountList()?{??

????????return?accountList;??

????}??

????public?void?setAccountList(String?accountList)?{??

????????this.accountList?=?accountList;??

????}??

????public?String?getDescription()?{??

????????return?description;??

????}??

????public?void?setDescription(String?description)?{??

????????this.description?=?description;??

????}??

????@Override??

????public?String?toString()???

????{??

????????return?"LaneArea?[lane_id="?+?laneId?+?",?lane_name="?+?laneName?+?",?facility_list="?+?facilityList?+?"]";??

????}??

}??

注意：1、我之前沒有在這個實體類里加入toString()，返回了一個對象，雖然也對，但是沒有直觀效果，這個toString()可以直觀的看到你返回的結果。

6、配置LaneAreaMapper.xml文件

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<?xml?version="1.0"?encoding="UTF-8"??>??

<!DOCTYPE?mapper?PUBLIC?"-//mybatis.org//DTD?Mapper?3.0//EN"?"http://mybatis.org/dtd/mybatis-3-mapper.dtd">??

<mapper?namespace="me.gacl.mapping.laneAreaMapper">??

????<!--?在select標簽中編寫查詢的SQL語句，?設置select標簽的id屬性為getUser，id屬性值必須是唯一的，??

????不能夠重復?使用parameterType屬性指明查詢時使用的參數類型，resultType屬性指明查詢返回的結果集類型???

????????resultType="me.gacl.po.LaneArea"就表示將查詢結果封裝成一個LaneArea類的對象返回?LaneArea類??

????????就是dim_lane_area表所對應的實體類?-->??

??????

????<select?id="getLaneAreaResultMap"?parameterType="int"?resultMap="LaneAreaResultMap">??

????????select?*?from?dim_lane_area?where?lane_id?=?#{lane_id}??

????</select>??

??????

????<resultMap?type="me.gacl.po.LaneArea"?id="LaneAreaResultMap">??

?????????<id?property="laneId"?column="lane_id"/>??

?????????<result?property="laneName"?column="lane_name"/>??

?????????<result?property="facilityList"?column="facility_list"?javaType="String"?jdbcType="VARBINARY"/>??

????</resultMap>??

</mapper>??

7、在conf.xml中注冊LaneAreaMapper.xml

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<?xml?version="1.0"?encoding="UTF-8"?>??

<!DOCTYPE?configuration?PUBLIC?"-//mybatis.org//DTD?Config?3.0//EN"?"http://mybatis.org/dtd/mybatis-3-config.dtd">??

<configuration>??

????<environments?default="development">??

????????<environment?id="development">??

????????????<transactionManager?type="JDBC"?/>??

??????????????

????????????<dataSource?type="POOLED">??

????????????????<property?name="driver"?value="oracle.jdbc.driver.OracleDriver"?/>??

????????????????<property?name="url"?value="jdbc:oracle:thin:@192.168.1.40:1521:ETL"?/>??

????????????????<property?name="username"?value="lane"?/>??

????????????????<property?name="password"?value="123"?/>??

????????????</dataSource>??

????????</environment>??

????</environments>??

??????

????<mappers>??

?????????<!--?注冊LaneAreaMapper.xml文件，???

?????????LaneAreaMapper.xml位于me.gacl.mapping這個包下，所以resource寫成me/gacl/mapping/LaneAreaMapper.xml-->??

?????????<mapper?resource="me/gacl/mapping/laneAreaMapper.xml"/>??

????</mappers>??

</configuration>??

8、編寫測試類

[java]?view plaincopy

package?me.gacl.test;??

import?java.io.IOException;??

import?java.io.InputStream;??

import?me.gacl.po.LaneArea;??

import?org.apache.ibatis.session.SqlSession;??

import?org.apache.ibatis.session.SqlSessionFactory;??

import?org.apache.ibatis.session.SqlSessionFactoryBuilder;??

public?class?Test1?{??

????public?static?void?main(String[]?args)?throws?IOException?{??

????????//mybatis的配置文件??

????????String?resource?=?"conf.xml";??

????????//使用類加載器加載mybatis的配置文件(它也加載關聯的映射文件)??

????????InputStream?is?=?Test1.class.getClassLoader().getResourceAsStream(resource);??

????????//構建sqlSession的工廠??

????????SqlSessionFactory?sessionFactory?=?new?SqlSessionFactoryBuilder().build(is);??

????????//使用MyBatis提供的Resources類加載mybatis的配置文件(它也加載關聯的映射文件)??

????????//Reader?reader?=?Resources.getResourceAsReader(resource);???

????????//構建sqlSession的工廠??

????????//SqlSessionFactory?sessionFactory?=?new?SqlSessionFactoryBuilder().build(reader);??

????????//創建能執行映射文件中sql的sqlSession??

????????SqlSession?session?=?sessionFactory.openSession();??

????????/**?

?????????*?映射sql的標識字符串，?

?????????*?me.gacl.mapping.userMapper是userMapper.xml文件中mapper標簽的namespace屬性的值，?

?????????*?getUser是select標簽的id屬性值，通過select標簽的id屬性值就可以找到要執行的SQL?

?????????*/??

????????String?statement?=?"me.gacl.mapping.laneAreaMapper.getLaneAreaResultMap";//映射sql的標識字符串??

????????LaneArea?laneArea?=?session.selectOne(statement,?8);??

????????System.out.println(laneArea);??

????}??

}??

啟動Tomact，運行Test1，返回結果如下：至此大工告成。 9、最后推薦一個自動生成實體類，Mapper.xml，DAO的工具：Mybatis-Generator 相關文章：點擊打開鏈接

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