Detailed explanation of MySql automatic truncation example

CREATE TABLE `p_app_station` (
 `WX_APP_ID` ​​varchar(20) NOT NULL,
 `APP_SECRET` varchar(33) DEFAULT NULL,
 `IS_BINDING` int(1) DEFAULT '0',
 `ACCOUNT_ID` int(13) DEFAULT NULL,
 `TOKEN` varchar(40) DEFAULT NULL,
 `BIND_URL` varchar(200) DEFAULT NULL,
 `WX_APP_NAME` varchar(50) DEFAULT NULL,
 `WX_APP_SID` varchar(50) DEFAULT NULL,
 `WX_NO` varchar(50) DEFAULT NULL,
 `CREATE_USER_ID` varchar(13) DEFAULT NULL,
 `UPDATE_DATE` datetime DEFAULT NULL,
 `CREATE_DATE` datetime DEFAULT NULL,
 `UPDATE_USER_ID` varchar(13) DEFAULT NULL,
 `STATION_TYPE` int(1) unsigned zerofill DEFAULT NULL COMMENT 'Mark type (trial version: 0, member version: 1, custom version: 2)',
 `ACTIVE_DATE` datetime DEFAULT NULL COMMENT 'Expiration date',
 `APP_MODULE_ID` varchar(60) DEFAULT NULL COMMENT 'Push template message ID',
 PRIMARY KEY (`WX_APP_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

insert into p_app_station(wx_app_id) values('12121312312312啊啊啊啊啊aassasdasd');
select * from p_app_station where wx_app_id like '12121312312312%';

Data truncated for column '%s' at row %ld

private void setupServerForTruncationChecks() throws SQLException {
  if (getJdbcCompliantTruncation()) {
    if (versionMeetsMinimum(5, 0, 2)) {
      String currentSqlMode = this.serverVariables.get("sql_mode");
 
      boolean strictTransTablesIsSet = StringUtils.indexOfIgnoreCase(currentSqlMode, "STRICT_TRANS_TABLES") != -1;
 
      if (currentSqlMode == null || currentSqlMode.length() == 0 || !strictTransTablesIsSet) {
        StringBuilder commandBuf = new StringBuilder("SET sql_mode='");
 
        if (currentSqlMode != null && currentSqlMode.length() > 0) {
          commandBuf.append(currentSqlMode);
          commandBuf.append(",");
        }
 
        commandBuf.append("STRICT_TRANS_TABLES'");
 
        execSQL(null, commandBuf.toString(), -1, null, DEFAULT_RESULT_SET_TYPE, DEFAULT_RESULT_SET_CONCURRENCY, false, this.database, null, false);
 
        setJdbcCompliantTruncation(false); // server's handling this for us now
      } else if (strictTransTablesIsSet) {
        // We didn't set it, but someone did, so we piggy back on it
        setJdbcCompliantTruncation(false); // server's handling this for us now
      }
 
    }
  }
}

private BooleanConnectionProperty jdbcCompliantTruncation = new BooleanConnectionProperty("jdbcCompliantTruncation", true,
    Messages.getString("ConnectionProperties.jdbcCompliantTruncation"), "3.1.2", MISC_CATEGORY, Integer.MIN_VALUE);