Question

我想通过它更新/删除项目。

当我尝试我的代码时，在我选择“更新按钮”后，没有任何内容正在更新。

当我尝试“删除按钮”时，也没有删除任何内容。

我想根据它删除我的商品ID。我在androidOpenDBHelper中使用了basecolumns._ID。

我的更新部分的logcat：

01-27 01:13:39.676: E/AndroidRuntime(29370): FATAL EXCEPTION: main
01-27 01:13:39.676: E/AndroidRuntime(29370): android.database.sqlite.SQLiteException: near "=": syntax error (code 1): , while compiling: UPDATE fuelLog SET tcost=?,fuelprice=?,fcon=?,odometer=?,date=?,preodometer=?,fuelpump=? WHERE _id=? AND date+=?
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1038)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:649)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.database.sqlite.SQLiteDatabase.updateWithOnConflict(SQLiteDatabase.java:1563)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.database.sqlite.SQLiteDatabase.update(SQLiteDatabase.java:1514)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at com.example.fuellogproject.updateAnddelete.updateLog(updateAnddelete.java:499)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at com.example.fuellogproject.updateAnddelete.onClick(updateAnddelete.java:411)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.view.View.performClick(View.java:4261)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.view.View$PerformClick.run(View.java:17356)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.os.Handler.handleCallback(Handler.java:615)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.os.Handler.dispatchMessage(Handler.java:92)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.os.Looper.loop(Looper.java:137)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at android.app.ActivityThread.main(ActivityThread.java:4921)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at java.lang.reflect.Method.invokeNative(Native Method)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at java.lang.reflect.Method.invoke(Method.java:511)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
01-27 01:13:39.676: E/AndroidRuntime(29370):    at dalvik.system.NativeStart.main(Native Method)

这是我的代码。

private void updateLog(fuelLogPojo updatefuelLogPojo) {
            // TODO Auto-generated method stub
            AndroidOpenDbHelper androidOpenDbHelper = new AndroidOpenDbHelper(this);
            SQLiteDatabase sqliteDatabase = androidOpenDbHelper.getWritableDatabase();


            // ContentValues class is used to store a set of values
            //It is like name-value pairs
            // "value" part contains the values that we are going to UPDATE
            ContentValues contentValues = new ContentValues();
            contentValues.put(AndroidOpenDbHelper.KEY_DATE, dateEditTextValue);
            contentValues.put(AndroidOpenDbHelper.KEY_PRICE, priceEditTextValue);
            contentValues.put(AndroidOpenDbHelper.KEY_FUEL, pumpEditTextValue);
            contentValues.put(AndroidOpenDbHelper.KEY_COST, costTextViewValue);
            contentValues.put(AndroidOpenDbHelper.KEY_ODM, odometerEditTextValue);
            contentValues.put(AndroidOpenDbHelper.KEY_PREODM, preodometerEditTextValue);
            contentValues.put(AndroidOpenDbHelper.KEY_CON, fconTextViewValue);

            // If we are using multiple whereClauseArguments, array size should have to change
            String[] whereClauseArgument = new String[1];
            whereClauseArgument[0] = updatefuelLogPojo.getdate();

            System.out.println("whereClauseArgument[0] is :" + whereClauseArgument[0]);

            /**
             * This is the normal SQL query for UPDATE
            UPDATE table_name
            SET column1=value, column2=value2,...
            WHERE some_column=some_value
            */      

            sqliteDatabase.update(AndroidOpenDbHelper.TABLE_NAME_LOG, contentValues, BaseColumns._ID+"=? AND date+=?", whereClauseArgument);
            // For two whereClauseArguments
            //sqliteDatabase.update(AndroidOpenDbHelper.TABLE_NAME_GPA, contentValues, BaseColumns._ID+"=? AND name=?", whereClauseArgument);

            sqliteDatabase.close();
            finish();
        }

Answer 1

whereClauseArgument是一个String数组，但在这里你有任何索引！ sqliteDatabase.delete（AndroidOpenDbHelper.TABLE_NAME_LOG，BaseColumns._ID +“=？”，whereClauseArgument）;

我不确定这个问题。但看看。可能你必须这样写： sqliteDatabase.delete（AndroidOpenDbHelper.TABLE_NAME_LOG，BaseColumns._ID +“=”，whereClauseArgument [0]）;

Answer 2

... WHERE _id=? AND date+=?

似乎有一个额外的+导致语法错误。

选择按钮时，项目不会更新或删除

2 个答案: