Spring JDBCTemplate更新問題

Question

在我的表定義中，有一列具有int數據類型。 如果值為“ 0”，則我希望jdbcTemplate更新方法默認使用“ NULL”而不是“ 0”更新此字段。

this.jdbcTemplate.update("UPDATE GCUR_OBSERVATION "
                + "SET ObserverId = ?," + "ObservationDate = ?,"
                + "PointCuring = ?"
                + " WHERE locationId = ? AND ObservationStatus = 0",
                new Object[] { new Integer(newObservation.getObserverId()),
                        newObservation.getObservationDate(),
                        new Integer(newObservation.getLocationId()) });

當Point Curing not NULL時，以上代碼段運行良好。 但是，如何將其作為NULL存儲在數據庫表中？

Answer 1

希望您收到NUll指針異常。

嘗試這個

Integer locId = null;

if(newObservation.getLocationId() != null) {
 locId = new Integer(newObservation.getLocationId());
 if(locId == 0) {
   locId = null;
 }
}

現在在這里傳遞locId。

this.jdbcTemplate.update("UPDATE GCUR_OBSERVATION "
                + "SET ObserverId = ?," + "ObservationDate = ?,"
                + "PointCuring = ?"
                + " WHERE locationId = ? AND ObservationStatus = 0",
                new Object[] { new Integer(newObservation.getObserverId()),
                        newObservation.getObservationDate(),
                        locId) });

Answer 2

假設getLocationId（）的返回類型為int，則下面的代碼將起作用。 正確的解決方法是將getLocationId（）的簽名更改為Integer，並確保對其進行初始化的代碼將其設置為NULL而不是0

this.jdbcTemplate.update("UPDATE GCUR_OBSERVATION "
                + "SET ObserverId = ?," + "ObservationDate = ?,"
                + "PointCuring = ?"
                + " WHERE locationId = ? AND ObservationStatus = 0",
                new Object[] { new Integer(newObservation.getObserverId()),
                        newObservation.getObservationDate(),
                        newObservation.getLocationId() == 0 ? null : new Integer(newObservation.getLocationId()) });