捕获重复条目异常

Question

我怎么能抓住这个例外:

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: 
                                      Duplicate entry '22-85' for key 'ID_CONTACT'

Answer 1

我用春天所以我们解决它 org.springframework.dao.DataIntegrityViolationException

    try {
        ao_history_repository.save(new AoHistory(..));
    }
    catch (DataIntegrityViolationException e) {
        System.out.println("history already exist");
    }

Answer 2

如果您使用的是Java 1.6+,则捕获SQLIntegrityConstraintViolationException

例如

try {
    ps.executeUpdate("INSERT INTO ...");
} catch (SQLIntegrityConstraintViolationException e) {
    // Duplicate entry
} catch (SQLException e) {
    // Other SQL Exception
}

要么

try {
    ps.executeUpdate("INSERT INTO ...");
} catch (SQLException e) {
    if (e instanceof SQLIntegrityConstraintViolationException) {
        // Duplicate entry
    } else {
        // Other SQL Exception
    }
}

Answer 3

我用的是春天。所以捕获 org.springframework.dao.DuplicateKeyException

try{
    ...
} catch (DuplicateKeyException dke) {
    ...
}