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错误我一再得到java.lang.IllegalArgumentException: column '_id' does not exist和应用程序崩溃，虽然我已经在表列和查询中包含_ID。列_ID不存在虽然它存在于表中
这里我试图从数据库中提取数据并使用自定义游标适配器显示列表视图。
表类
public class StockTable {
Context c1;
DatabaseObject d1;
Cursor c;
StockTable(Context mcontext){
c1=mcontext;
//---------------objects---------------------------//
d1=new DatabaseObject(c1);
//---------------objects ends----------------------//
}
// d1=new DatabaseObject(c1);
//-----------General Decelerations-------------------//
private String selectID;
private int storeID=0;
//-----------General Decelerations ends--------------//
//-----------table name and columns-----------------//
final String tablename="StockTable";
//public static final String _ID = "ID";
public String column1=" _ID";
public String column2="StockName";
//-----------table name and columns end-----------------//
final String stocktable = "CREATE TABLE " + tablename +
" (" + column1 + " INTEGER PRIMARY KEY , " + column2 + " TEXT) ";
public ContentValues insert(String one){
try{
selectID="Select Max("+ column1 + ") from " + tablename;
System.out.println(selectID);
c=d1.d.db.rawQuery(selectID,null);
System.out.println(c.getCount());
//System.out.println(c.getInt(0));
if(c.moveToNext())
{
System.out.println("Has Values");
}
else
{
System.out.println("No Values");
}
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
ContentValues cvi=new ContentValues();
// for(int i=0;i<=1;i++)
cvi.put(column1, c.getInt(0)+1);
cvi.put(column2,one);
return cvi;
}
public void delete(){
}
public void select(){
}
}
类，其中列表视图被填充。
public class stockmanager extends Activity{
/*public stockmanager() {
// TODO Auto-generated constructor stub
populatelist pl=new populatelist();
//pl.getView(position, getCurrentFocus(), null);
}*/
String getentry;
private int storeID=0;
DatabaseObject d;
StockTable st;
private String getstocks;
public Cursor a1;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.stockmanager);
d=new DatabaseObject(getApplicationContext());
st=new StockTable(getApplicationContext());
final Button AddStock=(Button) findViewById(R.id.button1);
final EditText entry=(EditText) findViewById(R.id.editText1);
final Button BroDetail=(Button) findViewById(R.id.button2);
final ListView popstocks=(ListView) findViewById(R.id.listView1);
AddStock.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
getentry=entry.getText().toString();
//st.insert(getentry);
System.out.println(getentry);
//d.db.rawQuery(st.select(), null);
d.d.db.insert(st.tablename, null,st.insert(getentry));
//populatelist populatestocks=new populatelist();
getstocks="Select " + st.column1 + " as _ID, " + st.column2 + " From "+ st.tablename;
System.out.println(getstocks);
a1=d.d.db.rawQuery(getstocks, null);
if(a1.moveToNext()){
System.out.println(a1.getCount());
}
else{
System.out.println("can't open database");
}
poplist populatestocks=new poplist(getApplicationContext(),a1) ;
popstocks.setAdapter(populatestocks);
}
});
}
public class poplist extends CursorAdapter{
public poplist(Context context, Cursor c) {
super(context, c);
// TODO Auto-generated constructor stub
}
//StockTable st1=new StockTable(getApplicationContext());
//Database d1=new Database(getApplicationContext());
@Override
public void bindView(View view, Context context, Cursor c) {
// TODO Auto-generated method stub
final CheckBox cb=(CheckBox) view.findViewById(R.id.checkBox1);
final Button view1=(Button) view.findViewById(R.id.button1);
if(c.moveToFirst()){
//cb.setText(a1.getString(a1.getColumnIndex(st1.column2)));
//do{
//cb.setText(a1.getString(a1.getColumnIndexOrThrow(st.column2)));
cb.setText(c.getString(1));
// }while (a1.moveToNext());
}
}
@Override
public View newView(Context context, Cursor c, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(R.layout.stocklist, parent, false);
bindView(v, context, c);
return v;
// return null;
}
}
public void Declerations(){
}
}
请帮我解决这个问题，因为我在过去的两天里一直在为此而战。
theres在您的声明“_ID”中有一个空格。还没有看到其他东西......这是故意的吗？ – TheOneWhoPrograms
是的，这是故意没有空间，它不采取'_'不知道为什么 – Siva
为什么不采取下划线？如果你愿意，“_ID”应该可以正常工作，但必须是其他错误，请尝试一下 – user2450263