SQLite的外鍵/

我已經創建了兩個表和第二表具有外鍵作爲第一表的主鍵，但在插入時的外鍵列保持空白.. 這裏的表..

public static final String KEY_Username = "username"; 
public static final String KEY_Password = "password"; 
public static final String KEY_SITE = "site"; 

private static final String DATABASE_NAME = "test"; 
private static final int DATABASE_VERSION = 1; 

private static final String SERVICE_OREDER = "Service_Order"; 
private static final String ERROR_CODE = "Error_Code"; 
private static final String SERVICE_OPERATION = "Service_Operation"; 
private static final String COMPONENT = "Component"; 
private static final String TECHNICIAN = "Technician"; 



//------------------------Service Order Table--------------------- 
private static final String KEY_SERVICE_ORDER_RECORD_NO="service_order_record_no"; 
private static final String KEY_OREDR_TYPE="order_type"; 
private static final String KEY_PRIORITY="priority"; 
private static final String KEY_PLANT="plant"; 
private static final String KEY_FUNCTIONAL_LOCATION="functional_location"; 
private static final String KEY_EQUIPMENT_DESC="equipment_description"; 
private static final String KEY_EQUIPMENT_NO="equipment_no"; 
private static final String KEY_CUSTOMER_ID="customer_id"; 
private static final String KEY_CUSTOMER_NAME="customer_name"; 
private static final String KEY_WIND_SPEED="wind_speed"; 
private static final String KEY_TOTAL_PRODUCTION="total_production"; 
private static final String KEY_NCR="NCR"; 
private static final String KEY_TOTAL_GRID_HR="total_grid_hours"; 
private static final String KEY_TOTAL_OPERATION_HR="total_operation_hours"; 
private static final String KEY_SERVICE_VISIT="service_visit_p_year"; 
private static final String KEY_ORDER_DESC="order_description"; 
private static final String KEY_ERRORCODE_START_DT="error_code_start_date_and_time"; 
private static final String KEY_MALFUNCTION_START_DT="malfunction_start_date_and_time"; 
private static final String KEY_MALFUNCTION_END_DT="malfunction_end_date_and_time"; 

private static final String SERVICE_ORDER_TABLE_CREATE = "CREATE TABLE "+SERVICE_OREDER+" ("+KEY_SERVICE_ORDER_RECORD_NO+" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL ,"+ 
     ""+KEY_OREDR_TYPE+" TEXT NOT NULL , "+KEY_PRIORITY+" TEXT, "+KEY_PLANT+" TEXT, "+KEY_FUNCTIONAL_LOCATION+" TEXT, "+ 
     ""+KEY_EQUIPMENT_DESC+" TEXT,"+KEY_EQUIPMENT_NO+" TEXT, "+KEY_CUSTOMER_ID+" TEXT, "+KEY_CUSTOMER_NAME+" TEXT,"+ 
     ""+KEY_WIND_SPEED+" TEXT, "+KEY_TOTAL_PRODUCTION+" TEXT, "+KEY_NCR+" TEXT,"+KEY_TOTAL_GRID_HR+" TEXT,"+ 
     ""+KEY_TOTAL_OPERATION_HR+" TEXT, "+KEY_SERVICE_VISIT+" TEXT, "+KEY_ORDER_DESC+" TEXT, "+ 
     ""+KEY_ERRORCODE_START_DT+" TEXT, "+KEY_MALFUNCTION_START_DT+" TEXT, "+KEY_MALFUNCTION_END_DT+" TEXT)"; 



//------------------------Error Code Table--------------------- 
private static final String KEY_ERROR_CODE_REC_NO ="error_code_record_no"; 
private static final String KEY_CODE_GROUP ="code_group"; 
private static final String KEY_CODE ="code"; 
private static final String KEY_SERVICE_ORDER_REC_NO="service_order_record_no"; 

private static final String ERROR_CODE_TABLE_CREATE = "CREATE TABLE "+ERROR_CODE+" ("+KEY_ERROR_CODE_REC_NO+" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,"+ 
     ""+KEY_CODE_GROUP+" TEXT,"+KEY_CODE+" TEXT, "+KEY_SERVICE_ORDER_REC_NO+" INTEGER,"+ 
     "FOREIGN KEY("+KEY_SERVICE_ORDER_REC_NO+") REFERENCES "+SERVICE_OREDER+"("+KEY_SERVICE_ORDER_RECORD_NO+") ON DELETE CASCADE)"; 


//-----------------------Service Operation Table----------------- 
private static final String KEY_SERVICE_OPE_REC_NO ="service_operation_record_no"; 
private static final String KEY_OPE_ACTIVITY ="operation_activity"; 
private static final String KEY_CONTROLLING_KEY ="controlling_key"; 
private static final String KEY_ACTION_TYPE ="action_type"; 
private static final String KEY_LONG_TEXT ="long_text"; 
private static final String KEY_WORK_HPM="work_hours_p_min"; 
private static final String KEY_SO_UNIT="unit"; 
private static final String KEY_NO_RESORCE ="no_of_resources"; 
private static final String KEY_ERROR_CODE_REC="error_code_record_no"; 

private static final String SERVICE_OPERATION_TABLE_CREATE ="CREATE TABLE "+SERVICE_OPERATION+" ("+KEY_SERVICE_OPE_REC_NO+" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,"+KEY_OPE_ACTIVITY+" TEXT, "+KEY_CONTROLLING_KEY+" TEXT, "+KEY_ACTION_TYPE+" TEXT, "+KEY_LONG_TEXT+" TEXT ,"+KEY_WORK_HPM+" TEXT, "+KEY_SO_UNIT+" TEXT , "+KEY_NO_RESORCE+" TEXT ,"+KEY_ERROR_CODE_REC+" INTEGER, FOREIGN KEY("+KEY_ERROR_CODE_REC+") REFERENCES "+ERROR_CODE+"("+KEY_ERROR_CODE_REC_NO+") ON DELETE CASCADE)"; 


// ------------------------Component Table---------------------- 
private static final String KEY_COMP_REC_NO = "component_record_no"; 
private static final String KEY_COMP_NO= "component_no"; 
private static final String KEY_COMP_DESC = "component_description"; 
private static final String KEY_COMP_ID = "component_id"; 
private static final String KEY_REQ_QTY = "required_quantity"; 
private static final String KEY_UOM = "UoM"; 
private static final String KEY_ITEM_CAT = "item_category"; 
private static final String Key_OPE_ACT = "operation_activity"; 
private static final String KEY_STOR_LOC ="storage_location"; 
private static final String KEY_VAL_TYPE ="valuation_type"; 
private static final String KEY_SER_OPR_REC_NO = "service_operation_record_no"; 
private static final String KEY_SER_NO_ARRY ="serial_nos_array"; 

private static final String COMP_TABLE_CREATE = "create table "+COMPONENT+" ("+KEY_COMP_REC_NO+" INTEGER primary key AUTOINCREMENT not null,"+ 
               ""+KEY_COMP_NO+" TEXT, "+KEY_COMP_DESC+" TEXT, "+KEY_COMP_ID+" TEXT, "+KEY_REQ_QTY+" TEXT,"+ 
               ""+KEY_UOM+" TEXT, "+KEY_ITEM_CAT+" TEXT , "+Key_OPE_ACT+" TEXT ,"+KEY_STOR_LOC+" TEXT,"+ 
               ""+KEY_VAL_TYPE+" TEXT ,"+KEY_SER_OPR_REC_NO+" INTEGER,"+KEY_SER_NO_ARRY+" TEXT,"+ 
               "FOREIGN KEY("+KEY_SER_OPR_REC_NO+") REFERENCES "+SERVICE_OPERATION+"("+KEY_SERVICE_OPE_REC_NO+") ON DELETE CASCADE)"; 

//------------------------Technician Table--------------------- 
private static final String KEY_TECH_REC_NO ="technician_record_no"; 
private static final String KEY_TECH ="technician"; 
private static final String KEY_WORK_HM ="work_hours_p_min"; 
private static final String KEY_UNIT ="unit"; 
private static final String KEY_DATETIME="date_and_time"; 
private static final String KEY_SERVICE_OP_REC_NO="service_operation_record_no"; 

private static final String TECH_TABLE_CREATE = "CREATE TABLE "+TECHNICIAN+" ("+KEY_TECH_REC_NO+" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL ,"+ 
               ""+KEY_TECH+" TEXT,"+KEY_WORK_HM+" TEXT, "+KEY_UNIT+" TEXT, "+KEY_DATETIME+" TEXT ,"+ 
               ""+KEY_SERVICE_OP_REC_NO+" INTEGER,FOREIGN KEY("+KEY_SERVICE_OP_REC_NO+") REFERENCES "+SERVICE_OPERATION+"("+KEY_SERVICE_OPE_REC_NO+") ON DELETE CASCADE)"; 


public SuzlonDBHelper(Context context, String name, CursorFactory factory,int version) { 
    super(context, name, factory, version); 
    // TODO Auto-generated constructor stub 
} 

public SuzlonDBHelper(Context context){ 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    // TODO Auto-generated method stub 
    db.execSQL(SERVICE_ORDER_TABLE_CREATE); 
    db.execSQL(ERROR_CODE_TABLE_CREATE); 
    db.execSQL(SERVICE_OPERATION_TABLE_CREATE); 
    db.execSQL(COMP_TABLE_CREATE); 
    db.execSQL(TECH_TABLE_CREATE); 
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    // TODO Auto-generated method stub 

} 


//------------------------------Insert into Service Order-------------------- 

public long insertServiceOrder(ServiceOrder serviceOrder){ 
    SQLiteDatabase db = this.getWritableDatabase(); 
    //db.execSQL("PRAGMA foreign_keys = ON;"); 
     ContentValues values = new ContentValues(); 

     values.put(KEY_OREDR_TYPE, serviceOrder.getOrderType()); 
     values.put(KEY_PRIORITY, serviceOrder.getPriority()); 
     values.put(KEY_PLANT, serviceOrder.getPlant()); 
     values.put(KEY_FUNCTIONAL_LOCATION, serviceOrder.getFunctionalLocation()); 
     values.put(KEY_EQUIPMENT_DESC, serviceOrder.getEquipmentDescription()); 
     values.put(KEY_EQUIPMENT_NO, serviceOrder.getEquipmentNo()); 
     values.put(KEY_CUSTOMER_ID, serviceOrder.getCustomerID()); 
     values.put(KEY_CUSTOMER_NAME, serviceOrder.getCustomerName()); 
     values.put(KEY_WIND_SPEED, serviceOrder.getWindSpeed()); 
     values.put(KEY_TOTAL_PRODUCTION, serviceOrder.getTotalProduction()); 
     values.put(KEY_NCR, serviceOrder.getNCR()); 
     values.put(KEY_TOTAL_GRID_HR, serviceOrder.getTotalGridHour()); 
     values.put(KEY_TOTAL_OPERATION_HR, serviceOrder.getTotalOperationHours()); 
     values.put(KEY_SERVICE_VISIT, serviceOrder.getServiceVisit()); 
     values.put(KEY_ORDER_DESC, serviceOrder.getOrderDescription()); 
     values.put(KEY_ERRORCODE_START_DT, serviceOrder.getErrorCodeStartDT()); 
     values.put(KEY_MALFUNCTION_START_DT, serviceOrder.getMalfunctionStartDT()); 
     values.put(KEY_MALFUNCTION_END_DT, serviceOrder.getMalfunctionEndDT()); 

     Long row = db.insert(SERVICE_OREDER, null, values); 
     db.close(); 
    return row; 


} 

//-------------------------------Insert into Error Code------------------------- 

public long insertErrorCode(DefectDamageCode defectDamage){ 
    SQLiteDatabase db = this.getWritableDatabase(); 
    //db.execSQL("PRAGMA foreign_keys = ON;"); 
     ContentValues values = new ContentValues(); 
     values.put(KEY_CODE_GROUP, defectDamage.getCodeGroups()); 
     values.put(KEY_CODE, defectDamage.getCodes()); 


     Long row = db.insert(ERROR_CODE, null, values); 
     db.close(); 
    return row; 
} 


//--------------------------------Insert into Service Operation---------------------- 

public long insertServiceOperation(AddServiceOperation serviceOperation){ 
    SQLiteDatabase db = this.getWritableDatabase(); 
    //db.execSQL("PRAGMA foreign_keys = ON;"); 
     ContentValues values = new ContentValues(); 
     values.put(KEY_OPE_ACTIVITY, serviceOperation.getOperationActivity()); 
     values.put(KEY_CONTROLLING_KEY, serviceOperation.getControllingKey()); 
     values.put(KEY_ACTION_TYPE, serviceOperation.getActivityType()); 
     values.put(KEY_LONG_TEXT, serviceOperation.getLongText()); 
     values.put(KEY_WORK_HPM, serviceOperation.getWorkHM()); 
     values.put(KEY_SO_UNIT, serviceOperation.getUnit()); 
     values.put(KEY_NO_RESORCE, serviceOperation.getNoOfResources()); 


     Long row = db.insert(SERVICE_OPERATION, null, values); 
     db.close(); 
    return row; 
} 


//---------------------------Insert into Component------------------------------ 

public long insertComponent(AddComponent addComponent){ 
    SQLiteDatabase db = this.getWritableDatabase(); 
    //db.execSQL("PRAGMA foreign_keys = ON;"); 
     ContentValues values = new ContentValues(); 
     values.put(KEY_COMP_NO, addComponent.getComponentNo()); 
     values.put(KEY_COMP_DESC, addComponent.getComponentDescription()); 
     values.put(KEY_COMP_ID, addComponent.getCommponentID()); 
     values.put(KEY_REQ_QTY, addComponent.getRequiredQty()); 
     values.put(KEY_UOM, addComponent.getUOM()); 
     values.put(KEY_ITEM_CAT, addComponent.getItemCategory()); 
     values.put(Key_OPE_ACT, addComponent.getOperationActivityComponent()); 
     values.put(KEY_STOR_LOC, addComponent.getStorageLocation()); 
     values.put(KEY_VAL_TYPE, addComponent.getValuationType()); 
     //values.put(KEY_SER_NO_ARRY,); 


     Long row = db.insert(COMPONENT, null, values); 
     db.close(); 
    return row; 
} 


//-------------------------------Insert into Technician----------------------------- 
public long insertTechnician(AddTechnician addTechnician){ 
    SQLiteDatabase db = this.getWritableDatabase(); 
    //db.execSQL("PRAGMA foreign_keys = ON;"); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_TECH, addTechnician.getTechnician()); 
     values.put(KEY_WORK_HM, addTechnician.getWorkHMTechnician()); 
     values.put(KEY_UNIT, addTechnician.getUnitTechnician()); 
     values.put(KEY_DATETIME, addTechnician.getDateTimeTechnician()); 

     Long row = db.insert(TECHNICIAN, null, values); 
     db.close(); 
    return row; 
}

}

我是否需要手動提供它或將數據庫管理.. ???

PPLZ幫助

感謝..

來源

2012-07-27 NaserShaikh

爲了實施ForeignKeys，你每次都需要執行下面的SQL語句，你打開的數據庫連接：

db.execSQL("PRAGMA foreign_keys = ON;");

之後，你就可以以通常的方式使用db對象。

來源

2012-07-27 10:00:00 waqaslam

謝謝waqas ..但我嘗試過，它已經努力工作..讓我添加我所有的dbhelper類.. – NaserShaikh 2012-07-27 10:19:59

外鍵表將保持空白。因爲外鍵應該限制引用在主表中不可用的記錄。因此，一旦在外鍵表中添加了一條記錄，它將首先使用主表的主鍵驗證其主鍵，然後允許插入。如果不這樣做，你不能輸入記錄。 – waqaslam 2012-07-27 10:28:21

在你的情況下，你需要使用[last_insert_rowid]（http://www.sqlite.org/lang_corefunc.html#last_insert_rowid）來獲取最後一個插入記錄的id，並使用這個id在子表中添加記錄。 – waqaslam 2012-07-27 10:30:25

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