这几天测试blob获取和存储的时候,被卡了很久,最后才发现是占用了关键字导致无法获取结果,血的教训啊.
以后起名字要用最恶心的,不要用最方便的了.闲话少说,java的hashmap是不能直接存储到数据库中的.
本地数据库为mysql,里面有blob的类型可供使用.方法也很简单,上代码
数据库建表
CREATE TABLE `test` (
`id` varchar(32) NOT NULL,
`fieldarr` blob,
PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Java类
public class Test implements Serializable{
private String id;
private byte[] fields;
public String getId(){
return id;
}
public void setId(String id){
this.id = id;
}
public byte[] getFields(){
return fields;
}
public void setFields(byte[] fields){
this.fields = fields;
}
}
然后配置ibatis
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap
PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
"http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap namespace="Test">
<!-- Use type aliases to avoid typing the full classname every time. -->
<typeAlias alias="Test" type="bruce.Test"/>
<resultMap id="FieldResult" class="Test">
<result property="id" column="ID"/>
<result property="fields" column="FIELDARR" jdbcType="BLOB" />
</resultMap>
<select id="selectTestByid" parameterClass="string" resultMap="FieldResult">
<!--[CDATA[
select * from test
where ID = #value#
]]>
</select>
<update id="updateTest" parameterClass="Test">
<![CDATA[
update test set
FIELDARR = #fields#
where
ID = #id#
]]-->
</update>
</sqlMap>
dao正常写就可以
public List<Test> selectTestByid(String id) throws SQLException {
1、 Web.xml
1） 配置hibernate
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/dbConnectionContext.xml /WEB-INF/serviceContext.xml</param-value> ......
