数据截断：日期时间值不正确：Java中的“null”

Question

I have a following query which insert data into mysql using java.

It gives me this error

Data truncation: Incorrect datetime value: 'null' for column 'lastEventTime' at row 1

The lastEventTime is set to be a nullable datetime type with default as NULL . Unfortunately when I run the same query in phpmyadmin it accept and data get inserted into the table. What is the solution for java then?

My of part codes is as below.

Answer 1

Single quotes ( ' ) denote string literals. Here, you didn't mean you insert the string 'null' , but an actual null value - just drop the quotes:

INSERT INTO tblDetails 
SET    eID=1010,entID=2,tID=65,eDateTime='2014-12-04 14:34:44',lastEventTime=null

Moreover, unless lsatEventTime has an undesirable default value, you could just drop the reference to it altogether and let the database use the default ( null ):

INSERT INTO tblDetails 
SET    eID=1010,entID=2,tID=65,eDateTime='2014-12-04 14:34:44'

EDIT:
To answer the question asked in the comments, this can be done even when dynamically constructing the insert statement. Just take the following line:

"',lastEventTime='"+rs10d.getString("lastEventTime")+"'";

... and add some logic to check for null s:

"',lastEventTime=" + (rs10d.getString("lastEventTime") == null ? 
                      "null" : 
                      "'"+rs10d.getString("lastEventTime")+"'");