處理iBatis NestedSQLException

Question

我有一個Java應用程序嘗試向表中插入一行，並且com.​ibatis.​common.​jdbc.​exception.NestedSQLException與原因一起拋出com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException 當我嘗試插入唯一鍵約束的dublicate數據時。

如何捕獲該異常？

Answer 1

要進入的根本原因，你可以做這樣的事情：

try { 
    //insert 
} catch (NestedSQLException e) { 
    Throwable t = e; 
    while(t.getCause() != null) { 
     t = t.getCause(); 
    } 
    //in your situation, now t should be MySQLIntegrityConstraintViolationException 
    if (t instanceOf MySQLIntegrityConstraintViolationException) { 
     //do something 
    } 
} 

Answer 2

在情況下，它可以幫助別人。 @ tibtof的是正確的，讓我到：

public int insert(MyObject myObject) { 
    int recCount = -1; 
    try { 
     recCount = insert(myObject, MyObjectMapper.class); 
    } catch (Throwable e) { 
     Throwable t = e; 
     while (t.getCause() != null) { 
      t = t.getCause(); 
      if (t instanceof SQLIntegrityConstraintViolationException) { 
       // get out gracefully. 
       recCount = -1; 
       return recCount; 
      } 
     } 
     //Something else wicked wrong happened. 
     LogUtils.error(log, e.getMessage(), e); 
     throw new RuntimeException(e.getMessage(), e); 
    } 
    return webGroup.getWebGroupId().intValue(); 
}