Java中用Mybatis插入mysql报主键重复的解决方案

public class DataBean {
    String key;
    String value;
 
    public DataBean() {
 
    }
    public DataBean(String key, String value) {
        this.key = key;
        this.value = value;
    }
 
    public String getKey() {
        return key;
    }
 
    public void setKey(String key) {
        this.key = key;
    }
 
    public String getValue() {
        return value;
    }
 
    public void setValue(String value) {
        this.value = value;
    }
 
    @Override
    public String toString() {
        return "DataBean{" +
                "key='" + key + '\'' +
                ", value='" + value + '\'' +
                '}';
    }
}

    <insert id="InsertDataToTestTable" parameterType="test.bean.DataBean">
        insert into testtable values(#{key},#{value})
    </insert>
 
    <update id="UpdateDataToTestTable" parameterType="test.bean.DataBean">
        UPDATE testtable SET value=#{value} WHERE `key`=#{key}
    </update>
 
    <select id="SelectDataToTestTable" parameterType="int" resultType="test.bean.DataBean">
        SELECT * from testtable where `key`=#{key}
    </select>

    public static void main(String[] args) {
        SqlSession session = SqlSessionFactoryUtil.getSqlSession();
         DataBean dataBean=new DataBean();
         dataBean.setKey("123");
         dataBean.setValue("1111");
 
 
         if(session.selectOne("DataMapper.SelectDataToTestTable",Integer.valueOf(dataBean.getKey()))!=null){
             //查看select语句输出结果
             System.out.println(session.selectOne("DataMapper.SelectDataToTestTable",Integer.valueOf(dataBean.getKey())));
             session.update("DataMapper.UpdateDataToTestTable",dataBean);
         }else {
             session.insert("DataMapper.InsertDataToTestTable", dataBean);
         }
            session.commit();
    }

    public static void main(String[] args) {
        SqlSession session = SqlSessionFactoryUtil.getSqlSession();
         DataBean dataBean=new DataBean();
         dataBean.setKey("123333");
         dataBean.setValue("123123");
 
 
 
         if(session.selectOne("DataMapper.SelectDataToTestTable",Integer.valueOf(dataBean.getKey()))!=null){
             //查看select语句输出结果
             System.out.println(session.selectOne("DataMapper.SelectDataToTestTable",Integer.valueOf(dataBean.getKey())));
             session.update("DataMapper.UpdateDataToTestTable",dataBean);
         }else {
             session.insert("DataMapper.InsertDataToTestTable", dataBean);
         }
            session.commit();
    }

<insert id="insertTask" parameterType="Task" useGeneratedKeys="true" keyProperty="id">