的Android SQLite的java.lang.IllegalArgumentException异常：列 '_id' 不存在

这里是我创建表...的Android SQLite的java.lang.IllegalArgumentException异常：列 '_id' 不存在

"CREATE TABLE IF NOT EXISTS Product (
    _ID INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE , 
    Name VARCHAR NOT NULL, 
    Code VARCHAR NOT NULL, 
    Quantity VARCHAR NOT NULL, 
    PRICE DOUBLE NOT NULL);"

如果我这样做。

myDb = new DbAdapter(getApplicationContext()); 
     Cursor res = myDb.getData(tbs.productsTable, tbs.getProductsColumns(), " ");  
     toast(res.getColumnName(0));

话，就说明_ID，但是当我这样做：

ListView lvItems = (ListView) findViewById(R.id.listViewProduct); 
     Populate_Products todoAdapter = new Populate_Products(this, res); 
     lvItems.setAdapter(todoAdapter);

它给了我这个错误：

03-14 19:36:52.459 31990-31990/com.example.danyalahmed.stockmanagement E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.danyalahmed.stockmanagement, PID: 31990 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.danyalahmed.stockmanagement/com.example.danyalahmed.stockmanagement.Activities.ListProducts}: java.lang.IllegalArgumentException: column '_id' does not exist at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442) at android.app.ActivityThread.access$800(ActivityThread.java:156) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:211) at android.app.ActivityThread.main(ActivityThread.java:5373) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815) Caused by: java.lang.IllegalArgumentException: column '_id' does not exist at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:303) at android.widget.CursorAdapter.init(CursorAdapter.java:172) at android.widget.CursorAdapter.(CursorAdapter.java:149) at com.example.danyalahmed.stockmanagement.Classes.Populate_Products.(Populate_Products.java:20) at com.example.danyalahmed.stockmanagement.Activities.ListProducts.loadData(ListProducts.java:52) at com.example.danyalahmed.stockmanagement.Activities.ListProducts.onCreate(ListProducts.java:37) at android.app.Activity.performCreate(Activity.java:5990) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442) at android.app.ActivityThread.access$800(ActivityThread.java:156) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:211) at android.app.ActivityThread.main(ActivityThread.java:5373) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)

来源

2016-03-14 Danyal Ahmed Chaudhry

Cursor列名是大小写敏感的，CursorAdapter希望看到小写_id。（SQL标识符本身不区分大小写。）

要么重命名列并重新创建表，要么只是明确地以小写形式（例如， SELECT _id, ...。

来源

2016-03-14 19:46:35 laalto

尝试_id，而不是在_ID CREATE陈述书

"CREATE TABLE IF NOT EXISTS Product (
_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE , 
Name VARCHAR NOT NULL, 
Code VARCHAR NOT NULL, 
Quantity VARCHAR NOT NULL, 
PRICE DOUBLE NOT NULL);"

来源

2016-03-14 19:55:41 Ashu

的Android SQLite的java.lang.IllegalArgumentException异常：列 '_id' 不存在

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