正文
3. Mybatis Insert
小程序:扫一扫查出行
【扫一扫了解最新限行尾号】
复制小程序
【扫一扫了解最新限行尾号】
复制小程序
案例:<?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="com.accp.mybatis.model.Blog"> <insert id="insertBlog" parameterType="Blog">
insert into Blog
(id,title,author_id)
values
(#{id},#{title},#{authorId})
</insert> </mapper>
<?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="com.accp.mybatis.model.Blog"> <insert id="insertBlog" parameterType="Blog">
insert into Blog
(id,title,author_id)
values
(#{id},#{title},#{authorId})
</insert> </mapper>
对于insert如果你的数据库支持自动生成主键的字段(比如 MySQL 和 SQL Server),那么你可以设置 useGeneratedKeys=”true”,然后把keyProperty 设成对应的列,就搞定了。
例如Blog表已经对 id 使用了自动生成的列类型,那么语句如下:
<?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="com.accp.mybatis.model.Blog"> <insert id="insertBlog" parameterType="Blog" useGeneratedKeys=”true” keyProperty=”id”>
insert into Blog
(title,author_id)
values
(#{title},#{authorId})
</insert> </mapper>
还可以使用selectKey元素。下面例子,使用mysql数据库nextval('student')为自定义函数,用来生成一个key。
例如:
<?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="com.accp.mybatis.model.Blog">
<insert id="insertBlog" parameterType="Blog" >
<selectKey keyProperty="studentID" resultType="String" order="BEFORE">
select nextval('id')
</selectKey>
insert into Blog
(id,title,author_id)
values
(#{id},#{title},#{authorId})
</insert>
</mapper>