[英]SQLite only creates 2 tables
由於某些原因,SQLite僅創建兩個表而不是4。我正在使用以下代碼:
@Override
public void onCreate(SQLiteDatabase db)
{
String TABLE_RECEIPT = "CREATE TABLE RECEIPT (receiptId INTEGER PRIMARY KEY AUTOINCREMENT, receiptDate INTEGER); ";
db.execSQL(TABLE_RECEIPT);
String TABLE_PRODUCT = "CREATE TABLE PRODUCT (productId INTEGER PRIMARY KEY AUTOINCREMENT, productName TEXT NOT NULL, productImagePath TEXT, productPrice REAL NOT NULL);";
db.execSQL(TABLE_PRODUCT);
String TABLE_RECEIPT_RULE = "CREATE TABLE RECEIPT_RULE (receiptId INTEGER NOT NULL, productId INTEGER NOT NULL, ruleAmount INTEGER NOT NULL, PRIMARY KEY (receiptId, productId), FOREIGN KEY(receiptId) REFERENCES RECEIPT(receiptId), FOREIGN KEY(productId) REFERENCES PRODUCT(productId));";
db.execSQL(TABLE_RECEIPT_RULE);
String TABLE_PRODUCT_ATTRIBUTES = "CREATE TABLE PRODUCT_ATTRIBUTES (productId INTEGER NOT NULL, attributeName TEXT NOT NULL, attributeValue TEXT NOT NULL, PRIMARY KEY (productId, attributeName), FOREIGN KEY(productId) REFERENCES PRODUCT(productId));";
db.execSQL(TABLE_PRODUCT_ATTRIBUTES);
Log.i(Config.TAG, "Recreated database");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
String TABLE_PRODUCT = "DROP TABLE PRODUCT;";
String TABLE_RECEIPT = "DROP TABLE RECEIPT;";
String TABLE_RECEIPT_RULE = "DROP TABLE RECEIPT_RULE;";
String TABLE_PRODUCT_ATTRIBUTES = "DROP TABLE PRODUCT_ATTRIBUTES;";
db.execSQL(TABLE_PRODUCT);
db.execSQL(TABLE_RECEIPT);
db.execSQL(TABLE_RECEIPT_RULE);
db.execSQL(TABLE_PRODUCT_ATTRIBUTES);
onCreate(db);
}
消息“ Recreated database
可見,因此它會嘗試創建所有表。 它沒有顯示任何類型的錯誤。
我不知道它是否有用,但是我正在使用以下代碼讀取現有表:
//Placed in SQLiteStorage
public Cursor showAllTables(){
String mySql = " SELECT name FROM sqlite_master " + " WHERE type='table' "
+ " AND name LIKE 'PR_%' ";
return db.rawQuery(mySql, null);
}
//In Activity, create the storage and calls the function
Cursor c = new SQLiteStorage(this).showAllTables();
if (c.moveToFirst())
{
while(!c.isAfterLast())
{
Log.i(Config.TAG, c.getString(0));
c.moveToNext();
}
}
在showAllTable函數中,您選擇了所有以PR開頭的表,因此查詢中僅顯示產品表和產品屬性表。
更改
字符串mySql =“從sqlite_master選擇名稱” +“ WHERE type ='table'” +“ AND名稱,如'PR_%'”;
至
字符串mySql =“從sqlite_master選擇名稱” +“ WHERE type ='table'”;
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