Question

我正在开发android使用SQLite，插入时我有android.database.sqlite.SQLiteException：靠近“If”......这是我的代码：

String query =
            " If Exists(Select " + orderID + " From Print Where " + categoryNum +  "= " + itemID + " and "  + orderID + " = " + holdedOrderID + " )" +
            " BEGIN " +
            " UPDATE Print Set " + qty +  " =  " + qty + "+ " + QTY + 
            " Where " + categoryNum +  "= " + itemID + " and "  + orderID + " = " + holdedOrderID +
            " END " +
            " Else   " +
            " BEGIN  " +
            "  Insert Into orderDetails ( " + PRODUCT_NAME +","+ categoryName +","+ categoryNum +","+ orderID +","+ price +","+ qty + " , " + tabelNumber     +")"   
            + "   Values                  (" + "'" + itemName + "'" +","+  "'" +itemCategory + "'" +","+ itemID +","+  "'" + holdedOrderID +  "'" + ","+ itemPrice +","+ QTY  +","+  "'" +tableNumberz +  "'" + ") " +    
            "  END";
    mDb.execSQL(query);

Answer 1

SQLite没有IF语句。

但奇怪的巧合是，Java拥有它：

String selection = categoryNum +  "= " + itemID + " and "  + orderID + " = " + holdedOrderID;
if (DatabaseUtils.queryNumEntries(mDb, "Print", selection) > 0) {
    mDb.execSQL("UPDATE ...");
} else {
    mDb.insert(...);
}

android.database.sqlite.SQLiteException：near“If”：语法错误（代码1）

1 个答案: