Question

我已经尝试根据我在此网站上找到的建议编辑我的代码，但似乎没有任何工作..我仍然不断收到以下logcat错误：

03-24 11:44:27.037: E/AndroidRuntime(1809): Caused by: android.database.sqlite.SQLiteException: 
ambiguous column name: _id (code 1): , while compiling: 
CREATE VIEW customerView AS SELECT _id AS _id,   fName, lName, customerMeterId, customerMeterNumber,   customerPlotNumber, _id FROM customers AS customers  
INNER JOIN meters AS meters ON customerMeterId =_id

上面在logcat中引用的类：

public class ViewCustomers {

public static final String TABLE_CUSTOMER_VIEW = "customerView";

public static final String CUSTOMER_VIEW_ID = CustomerTableDetails.KEY_CUSTOMER_ID;
public static final String CUSTOMER_VIEW_FIRSTNAME = CustomerTableDetails.KEY_FIRST_NAME;
public static final String CUSTOMER_VIEW_LASTNAME = CustomerTableDetails.KEY_LAST_NAME;
public static final String CUSTOMER_VIEW_METER = CustomerTableDetails.KEY_METER_NUMBER;
public static final String CUSTOMER_VIEW_PLOT = CustomerTableDetails.KEY_PLOT_NUMBER;
public static final String CUSTOMER_VIEW_KEY_METER_ID = CustomerTableDetails.KEY_METER_ID;

private static final String CREATE_CUSTOMER_VIEW = ""
        + "CREATE VIEW " + TABLE_CUSTOMER_VIEW 
        + " AS SELECT "+ CustomerTableDetails.KEY_CUSTOMER_ID+" AS _id,"+
        " "+CustomerTableDetails.KEY_FIRST_NAME+","+
        " "+CustomerTableDetails.KEY_LAST_NAME+","+
        " "+CustomerTableDetails.KEY_METER_ID+","+
        " "+CustomerTableDetails.KEY_METER_NUMBER+","+
        " "+CustomerTableDetails.KEY_PLOT_NUMBER+","+
        " "+MeterTableDetails.METER_ID+""+
        " FROM "+CustomerTableDetails.TABLE_CUSTOMERS+" AS customers "+" INNER JOIN "+MeterTableDetails.TABLE_METERS+" AS meters"+
        " ON "+CustomerTableDetails.KEY_METER_ID+" ="+MeterTableDetails.METER_ID;


public static void onCreate(SQLiteDatabase database) {
    database.execSQL(CREATE_CUSTOMER_VIEW);
}

public static void onUpgrade(SQLiteDatabase database, int oldVersion,
        int newVersion) {
    Log.w(ViewCustomers.class.getName(), "Upgrading database from version "
            + oldVersion + " to " + newVersion
            + ", which will destroy all old data");
    database.execSQL("DROP VIEW IF EXISTS " + ViewCustomers.TABLE_CUSTOMER_VIEW);
    onCreate(database);
}

我甚至使用别名但仍然没有解决方案。现在我不知道如何解决它。

修改

更正后：

 private static final String CREATE_CUSTOMER_VIEW = ""
        + "CREATE VIEW " + TABLE_CUSTOMER_VIEW 
        + " AS SELECT "+MeterTableDetails.TABLE_METERS+"."+MeterTableDetails.METER_ID+""+" AS "+ MeterTableDetails.TABLE_METERS+"."+MeterTableDetails.METER_ID +","+
        " "+CustomerTableDetails.KEY_FIRST_NAME+","+
        " "+CustomerTableDetails.KEY_LAST_NAME+","+
        " "+CustomerTableDetails.KEY_METER_ID+","+
        " "+CustomerTableDetails.KEY_METER_NUMBER+","+
        " "+CustomerTableDetails.KEY_PLOT_NUMBER+","+
        " "+CustomerTableDetails.TABLE_CUSTOMERS+"."+ CustomerTableDetails.KEY_CUSTOMER_ID+

        " FROM "+CustomerTableDetails.TABLE_CUSTOMERS+" AS customers "+" INNER JOIN "+MeterTableDetails.TABLE_METERS+" AS meters"+
        " ON "+CustomerTableDetails.KEY_METER_ID+" ="+MeterTableDetails.TABLE_METERS+"."+MeterTableDetails.METER_ID;

编辑2

03-24 13:58:24.687: I/create statement(3098): CREATE VIEW customerView AS SELECT meters._id AS   meters._id, fName, lName, customerMeterId, customerMeterNumber, 
customerPlotNumber, customers._id FROM customers AS customers  
INNER JOIN meters AS meters ON customerMeterId = meters._id

Answer 1

使用tablename._id以在上面的查询中引用_id

变化：

CREATE VIEW customerView AS SELECT _id AS _id,
fName, lName, customerMeterId, customerMeterNumber, 
customerPlotNumber, _id FROM customers AS customers  
INNER JOIN meters AS meters ON customerMeterId =_id

到

CREATE VIEW customerView AS SELECT customers._id AS _id, 
fName, lName, customerMeterId, customerMeterNumber,   customerPlotNumber, 
_id FROM customers AS customers  
INNER JOIN meters AS meters ON 
customerMeterId =customers._id // or meters._id -> whatever you think suits

或

CREATE VIEW customerView AS SELECT meters._id AS _id, 
fName, lName, customerMeterId, customerMeterNumber,   customerPlotNumber, 
_id FROM customers AS customers  
INNER JOIN meters AS meters ON customerMeterId =meters._id

在android中重复出现模糊列名_id sqlite错误

1 个答案: