mybatis 批量插入，报唯一索引字段重复插入 Duplicate entry

 
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '057f31082f1c4534af4c2d5f334c6124' for key 'uni_trans'
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
    at com.mysql.jdbc.Util.getInstance(Util.java:408)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)

解答：综上所示，其实批量的数据是不重复的，而插入操作却报了某个值重复插入，查了一个解决方式也亲测可用。

   1  数据库连接字符串 必须配置 allowMultiQueries=true

如 jdbc:mysql://192.168.166.181:3306/promotion?allowMultiQueries=true&autoReconnect=true&useSSL=false&characterEncoding=utf-8  

2 插入sql语句中 加入ignore关键字

 如

<insert id="batchSaveFinale" parameterType="java.util.List" useGeneratedKeys="true" keyProperty="id">
    insert ignore into tpromotion_finalist
    (
    user_id, 
    transac_id,
    phone,
    create_time
    )
    values
    <foreach item="item" collection="list" separator="," >
        (
        #{item.userId}, 
        #{item.transacId},
        #{item.phone},
        #{item.createTime}
        )
    </foreach>
</insert>