所以我正在为我的第一个Android应用程序编写数据库，但是这里的代码出了问题。
public class MySQLHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "SWMdatabase";
private static final String TABLE_WALLET = "Wallet";
private static final String TABLE_TRANSACTION = "Transaction";
private static final String KEY_WALLET_ID = "_WalletId";
private static final String KEY_TRANS_ID = "_TransId";
private static final String KEY_CREATED_ON = "CreatedOn";
private static final String KEY_WALLET_NAME = "WalletName";
private static final String KEY_WALLET_SUM = "WalletSum";
private static final String KEY_AMOUNT = "Amount";
public MySQLHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Database onCreate and onUpgrade
// --------------------------------------------------
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_WALLET_TABLE = "CREATE TABLE " + TABLE_WALLET + " ( "
+ KEY_WALLET_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ KEY_WALLET_NAME + " TEXT NOT NULL, "
+ KEY_WALLET_SUM + " REAL NOT NULL )";
db.execSQL(CREATE_WALLET_TABLE);
String CREATE_TRANSACTION_TABLE = "CREATE TABLE " + TABLE_TRANSACTION + " ( "
+ KEY_TRANS_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ KEY_AMOUNT + " REAL NOT NULL, "
+ KEY_WALLET_ID + " INTEGER NOT NULL, "
+ KEY_CREATED_ON + " TEXT NOT NULL )";
db.execSQL(CREATE_TRANSACTION_TABLE);
}
它抛出一个SQLiteException语法错误'near“Transaction”，我不知道如何以及为什么。我还仔细检查了CREATE_TRANSACTION_TABLE无数次，但还是想不通。