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根据条件进行模糊查询
@Select("({ +" +
"<script>" +
"select" +
"*" +
"from chat_history" +
"where 1 = 1 AND content like " +
"<if test=search_key != null>" +
"#{search_key}" +
"</if> and (to_id = #{user_id} or send_id = #{user_id}) AND del_flag = 0" +
"</script>" +
"})")
List<Map> findMessages(Map params);