我正在尝试从 Java 应用程序更新表,其中特定列可能 为 NULL。我尝试了几种不同的方法,但总是出现以下错误:
com.mysql.jdbc.MysqlDataTruncation:数据截断:日期值不正确:第 1 行的“scheidingsdatum”列为“null”
我确保表允许scheidingsdatum字段为NULL值,并且在MySQL中直接插入时可以插入NULL值
这是 PHPMyAdmin 中的表结构:
表使用innoDB
我尝试了以下解决方案:
1: 只需在参数中使用 NULL 变量
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:在查询中硬编码 NULL(在 if/else block 内)
stmnt = conn.prepareStatement("UPDATE gezinnen SET "
+ "ouder1 = ?,"
+ "ouder2 = ?,"
+ "huwelijksdatum = ?,"
+ "scheidingsdatum = NULL "
+ "WHERE gezinsNummer = ?");
stmnt.setString(1, ouder1);
stmnt.setString(2, ouder2);
stmnt.setString(3, huwelijksdatum);
stmnt.setString(4, nummer);
3:使用setNull(4, java.sql.Types.DATE)
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.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 = ?,"
+ "ouder2 = ?,"
+ "huwelijksdatum = ?,"
+ "scheidingsdatum = ? "
+ "WHERE gezinsNummer = ?");
stmnt.setString(1, ouder1);
stmnt.setString(2, ouder2);
stmnt.setString(3, huwelijksdatum);
stmnt.setNull(4, 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"));
最佳答案
我刚刚做了一个测试,它对我有用 stmnt.setNull(4, java.sql.Types.Date);
,你确定 stmnt.setString(3 , huwelijksdatum);
huwelijksdatum 的值是一个有效的 mysql 日期字符串而不是 "null"?
关于java - MySQL 不正确的日期值 : null,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33223662/