java – MySQL日期值不正确：null

com.mysql.jdbc.MysqlDataTruncation：数据截断：日期值不正确：第1列“scheidingsdatum”列为“null”

我确保该表允许scheidingsdatum字段的NULL值,并且可以在直接插入MySQL时插入NULL值

这是PHPMyAdmin中的表结构：

表使用innoDB

我已经尝试了以下解决方案：

1：只需在参数中使用NULL变量即可

stmnt = conn.prepareStatement("UPDATE gezinnen SET "
                            + "ouder1 = ?," 
                            + "ouder2 = ?," 
                            + "huwelijksdatum = ?,"
                            + "scheidingsdatum = ? "
                            + "WHERE gezinsNummer = ?");

stmnt.setString(1,ouder1);
stmnt.setString(2,ouder2);
stmnt.setString(3,huwelijksdatum);
stmnt.setString(4,scheidingsdatum);
stmnt.setString(5,nummer);

2：查询中的Hardcode NULL(if / else块内)

stmnt = conn.prepareStatement("UPDATE gezinnen SET "
                            + "ouder1 = ?,"
                            + "scheidingsdatum = NULL "
                            + "WHERE gezinsNummer = ?");

stmnt.setString(1,nummer);

3：使用setNull(4,java.sql.Types.DATE)

stmnt = conn.prepareStatement("UPDATE gezinnen SET "
                            + "ouder1 = ?,huwelijksdatum);
stmnt.setNull(4,java.sql.Types.DATE);
stmnt.setString(5,nummer);

4：使用setNull(4,java.sql.Types.NULL)

stmnt = conn.prepareStatement("UPDATE gezinnen SET "
                            + "ouder1 = ?,java.sql.Types.NULL);
stmnt.setString(5,nummer);

以下是我的database.properties文件和连接创建：

database.properties

jdbc.drivers=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://IP:3306/TABLE_NAME
jdbc.username=USER
jdbc.password=PASSWORD

连接创建

Class.forName(props.getProperty("jdbc.drivers")).newInstance();
this.conn = (Connection) DriverManager.getConnection(props.getProperty("jdbc.url"),props.getProperty("jdbc.username"),props.getProperty("jdbc.password"));