Android-内容值插入重复4次

由于某些原因，当我尝试插入多个数据时，每行会有4个重复项。我尝试了cv.clear（），也尝试了cv=newcontentvalues（），但我不知道是什么原因导致它插入了4次。for循环当然只运行两次，它调用db.insert两次。但我认为这与我看不到的内容价值有关

在MainActivity.java中

DBAdapter db = new DBAdapter(this);
db.open();    

String[] skuArray = { "1234", "4569" };
String[] nameArray = { "Something", "Anything" };
String[] descriptionArray = { "It is something", "It is anything" };
String[] costArray = { "$5.00", "$10.00"};
for (int i = 0; i < skuArray.length; i++) {
    String sku = skuArray[i];
    String name = nameArray[i];
    String description = descriptionArray[i];
    String cost = costArray[i];     
    db.insert(sku, name, description, cost;
} 

DBAdapter.java loadAllItemsQuery（）方法

结果:

Count row: 8
Current row position: 0
sku: 1234
Count row: 8
Current row position: 1
sku: 1234
Count row: 8
Current row position: 2
sku: 1234
Count row: 8
Current row position: 3
sku: 1234
Count row: 8
Current row position: 4
sku: 4569
Count row: 8
Current row position: 5
sku: 4569
Count row: 8
Current row position: 6
sku: 4569
Count row: 8
Current row position: 7
sku: 4569

---

问题可能是您的加入，导致它返回每个sku 4次

试试这个：

String SELECT_ITEM_QUERY = "SELECT DISTINCT " + ITEM_SKU + ", " + ITEM_NAME + ", " + ITEM_DESCRIPTION + ", " + PRICE_COST + " FROM " + ITEM_TABLE + " INNER JOIN " + PRICE_TABLE;

---

更好的选择：查看查询并更恰当地构建它，而不是选择distinct。还可以尝试打印所有阵列。如果其他字段中的值存在差异，您仍将继续获得超出预期的行和检查您的数据是否正常。查询可能是正确的，但数据也可能会导致问题。

价格SKU和

项目SKU

值来自何处？请分享导致问题的原因。

Count row: 8
Current row position: 0
sku: 1234
Count row: 8
Current row position: 1
sku: 1234
Count row: 8
Current row position: 2
sku: 1234
Count row: 8
Current row position: 3
sku: 1234
Count row: 8
Current row position: 4
sku: 4569
Count row: 8
Current row position: 5
sku: 4569
Count row: 8
Current row position: 6
sku: 4569
Count row: 8
Current row position: 7
sku: 4569

String SELECT_ITEM_QUERY = "SELECT DISTINCT " + ITEM_SKU + ", " + ITEM_NAME + ", " + ITEM_DESCRIPTION + ", " + PRICE_COST + " FROM " + ITEM_TABLE + " INNER JOIN " + PRICE_TABLE;