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我的更新语句有问题。我试图从我的数据库更新用户,我确定这个用户在我的数据库中,但我无法更新他。我觉得我有错我的列名,因为错误说:android.database.sqlite.SQLiteException:没有这样的列:更新
android.database.sqlite.SQLiteException: no such column: UPDATE
但我从来没有问过此列,nnn
不是列在所有在我的计划。这里是
public void changeprofiel(String id, Profiel p){
SQLiteDatabase db = this.getWritableDatabase();
/* ContentValues contentValues = new ContentValues();
contentValues.put(COL_2_PROFIELEN, p.getUsername());
contentValues.put(COL_3_PROFIELEN, p.getFirstname());
contentValues.put(COL_4_PROFIELEN, p.getEmail());
contentValues.put(COL_5_PROFIELEN, p.getPassword());*/
// de insert methode geeft -1 terug als het niet gelukt is en de row value als het wel gelukt is
System.out.println(getProfielWid(id).getId());
// db.update(TABLE_NAME_PROFIELEN, contentValues,COL_1_PROFIELEN ="'" + id +"'",null);
db.execSQL("UPDATE "+ TABLE_NAME_PROFIELEN + " SET "+COL_2_PROFIELEN+" = "+p.getUsername()+", " +COL_3_PROFIELEN+" = "+p.getFirstname()+", "+COL_4_PROFIELEN+" = "+p.getEmail()+", "+COL_5_PROFIELEN+" = "+p.getPassword()+
" WHERE " + COL_1_PROFIELEN + "=" + id + "");
}
我也试过这样的地方closule声明:
" WHERE " + COL_1_PROFIELEN + "='" + id + "'");
但是他们给我都这个错误:
I/System.out: nnnnnn
E/SQLiteLog: (1) no such column: nnn
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.cedri.bcv, PID: 13908
android.database.sqlite.SQLiteException: no such column: nnn (code 1): , while compiling: UPDATE profielen SET username = nnn, firstname = nnn, email = nnn, password = xxx WHERE profile_id=nnnnnn
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1677)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1608)
at com.example.cedri.bcv.DB.DatabaseHelper.changeprofiel(DatabaseHelper.java:82)
at com.example.cedri.bcv.Activities.MainActivity.savechanges(MainActivity.java:94)
at com.example.cedri.bcv.Fragments.AccountFragment$1.onClick(AccountFragment.java:86)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6121)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
我是否需要设置每一个值单引号之间?
学习使用的参数。不要将随机字符串转储到查询字符串中。您可能会遇到语法错误(以及使代码易受SQL注入影响)。 –
是的,如果你使用rawquery,那么每个文本/字符串类型值都需要单引号,但是你可以采用@Gordon建议的方法,在这里你可以得到一个想法https://developer.android.com/training/basics/data-storage /databases.html – Pavan
谢谢我使用单引号! – Peter