因为我是android的初学者。我被困在数据库程序。我多次检查了所有程序并且icouldnt找到了解决方案。点击我的应用程序很遗憾停止。我在logcat中收到以下错误..
<`10-20 13:03:10.910: E/SQLiteLog(982): (1) near "fromFRIENDSwhereCITYNOT": syntax error
10-20 13:03:10.930: D/AndroidRuntime(982): Shutting down VM
10-20 13:03:10.930: W/dalvikvm(982): threadid=1: thread exiting with uncaught exception (group=0x414c4700)
10-20 13:03:11.120: E/AndroidRuntime(982): FATAL EXCEPTION: main
10-20 13:03:11.120: E/AndroidRuntime(982): java.lang.IllegalStateException: Could not execute method of the activity
10-20 13:03:11.120: E/AndroidRuntime(982): at android.view.View$1.onClick(View.java:3633)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.view.View.performClick(View.java:4240)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.view.View$PerformClick.run(View.java:17721)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.os.Handler.handleCallback(Handler.java:730)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.os.Handler.dispatchMessage(Handler.java:92)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.os.Looper.loop(Looper.java:137)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.app.ActivityThread.main(ActivityThread.java:5103)
10-20 13:03:11.120: E/AndroidRuntime(982): at java.lang.reflect.Method.invokeNative(Native Method)
10-20 13:03:11.120: E/AndroidRuntime(982): at java.lang.reflect.Method.invoke(Method.java:525)
10-20 13:03:11.120: E/AndroidRuntime(982): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-20 13:03:11.120: E/AndroidRuntime(982): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-20 13:03:11.120: E/AndroidRuntime(982): at dalvik.system.NativeStart.main(Native Method)
10-20 13:03:11.120: E/AndroidRuntime(982): Caused by: java.lang.reflect.InvocationTargetException
10-20 13:03:11.120: E/AndroidRuntime(982): at java.lang.reflect.Method.invokeNative(Native Method)
10-20 13:03:11.120: E/AndroidRuntime(982): at java.lang.reflect.Method.invoke(Method.java:525)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.view.View$1.onClick(View.java:3628)
10-20 13:03:11.120: E/AndroidRuntime(982): ... 11 more
10-20 13:03:11.120: E/AndroidRuntime(982): Caused by: android.database.sqlite.SQLiteException: near "fromFRIENDSwhereCITYNOT": syntax error (code 1): , while compiling: select * fromFRIENDSwhereCITYNOT IN(?,?)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
10-20 13:03:11.120: E/AndroidRuntime(982): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1253)
10-20 13:03:11.120: E/AndroidRuntime(982): at com.example.database.DatabaseActivity.clicked(DatabaseActivity.java:65)
10-20 13:03:11.120: E/AndroidRuntime(982): ... 14 more
`>
我的活动是......
<`package com.example.database;
import com.example.database.Contractclass.Friends;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.view.Menu;
import android.view.View;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
public class DatabaseActivity extends Activity {
DatabaseHelper dbHelper;
String[]names={"sum","chan","hop","nav"};
String[] cities={"mpl","kpm","vignr","nrml"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_database);
Toast.makeText(this, "hello", Toast.LENGTH_LONG).show();
dbHelper=new DatabaseHelper(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.database, menu);
return true;
}
public void clicked(View v)
{
SQLiteDatabase db;
switch (((RadioGroup)findViewById(R.id.radioGroup1)).getCheckedRadioButtonId()) {
case R.id.radio0:
db=dbHelper.getWritableDatabase();
ContentValues cv=new ContentValues();
db.beginTransaction();
for(int i=0;i<names.length;i++)
{
cv.put(Friends.COLUMN_NAME1, names[i]);
cv.put(Friends.COLUMN_NAME2, cities[i]);
db.insert(Friends.TABLE_NAME, null, cv);
}
db.endTransaction();
db.close();
Toast.makeText(this, "1", Toast.LENGTH_LONG).show();
break;
case R.id.radio1:
TextView data=(TextView)findViewById(R.id.textView1);
data.setText("");
db=dbHelper.getReadableDatabase();
Toast.makeText(this, "12", Toast.LENGTH_LONG).show();
String sql="select * from "+Friends.TABLE_NAME+" where "+Friends.COLUMN_NAME2+" NOT IN(?,?)";
String[] removecities={"mpl","kpm"};
Cursor selecteddata=db.rawQuery(sql, removecities);
if(selecteddata.getCount()==0)
{
data.setText("your are stupid");
}
else
{
while (selecteddata.moveToNext()) {
data.append(selecteddata.getString(selecteddata.getColumnIndex(Friends.COLUMN_NAME1))+","+selecteddata.getString(selecteddata.getColumnIndex(Friends.COLUMN_NAME2))+"\n");
}
}
break;
case R.id.radio2:
db=dbHelper.getWritableDatabase();
db.delete(Friends.TABLE_NAME, null, null);
db.close();
break;
case R.id.radio3:
db=dbHelper.getWritableDatabase();
ContentValues cv2=new ContentValues();
for(int i=0;i<cities.length;i++)
{
cv2.put(Friends.COLUMN_NAME2, (cities[i]+i));
db.update(Friends.TABLE_NAME, cv2, Friends.COLUMN_NAME2+"=?", new String[]{cities[i]});
}
db.close();
break;
}
}
}
`>
我的合同类......
<`package com.example.database;
import android.provider.BaseColumns;
public class Contractclass {
public static final int DATABASE_VERSION=3;
public static final String DATABASE_NAME="Database.db";
public static abstract class Friends implements BaseColumns{
public static final String TABLE_NAME="FRIENDS";
public static final String COLUMN_NAME1="NAME";
public static final String COLUMN_NAME2="CITY";
}
}
`>
我的databasehelper类是......
<
`
{
package com.example.database;
import com.example.database.Contractclass.Friends;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHelper extends SQLiteOpenHelper {
public DatabaseHelper(Context context) {
super(context, Contractclass.DATABASE_NAME , null, Contractclass.DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
// public DatabaseHelper(DatabaseActivity databaseActivity) {
// // TODO Auto-generated constructor stub
// super(null, null, null, 0);
// }
public static final String CREATE_DB="CREATE TABLE"+Friends.TABLE_NAME+"("+Friends._ID+"INTEGER"+" PRIMARYKEY,"+Friends.COLUMN_NAME1+"TEXT,"+Friends.COLUMN_NAME2+"TEXT)";
public static final String DROP_DB="DROP TABLE IF EXISTS"+Friends.TABLE_NAME;
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
try{
db.execSQL(CREATE_DB);
}
catch(SQLException ex)
{
ex.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldversion, int newversion) {
// TODO Auto-generated method stub
try{
db.execSQL(DROP_DB);
}
catch(SQLException ex)
{
ex.printStackTrace();
}
onCreate(db);
}
}
`>
答案 0 :(得分：1)
您的错误日志显示您正在传递“fromFRIENDSwhereCITY”查询，而且条款之间没有空格。它必须是“来自FRIENDS where CITY”，所以sqlite自然会引发语法错误。
答案 1 :(得分：0)
错误的主要原因是，在第一次执行期间，即使Activity停止，也会在内存中创建一个表（FRIENDS）。解决方案是将Contract Class中的数据库版本更改为比当前更高的值。然后执行调用onUpgrade（）方法并创建新表（FRIENDS）并执行而不会突然停止Activity。