使用eclipse在sqlite中找不到这样的列

Question

我正在学习 SQLite 数据库，当我传递两个值 Date 和 Name 时，所有数据都会从我的数据库中检索并显示在我的用户界面 EditBox 上。
当我将Date 和Name 值放入编辑框中并单击显示按钮时，模拟器不幸停止并出现以下错误：

Logcat 错误-:08-03 23:08:06.730: E/AndroidRuntime(1099): android.database.sqlite.SQLiteException：没有这样的列：Xyz（代码1）： , 编译时：SELECT date, name, pay, permit FROM Salary 其中名称=Xyz AND 日期=03-08-2015

代码如下：

// MainActivity.java

Display.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            String SdateTime=SDate.getText().toString();
            String SnameTime=SName.getText().toString();
            //long l=Long.parseLong(n);
            HotOrNot hon=new HotOrNot(MainActivity.this);
            hon.open();
            String returnName=hon.getName(SdateTime,SnameTime);
            String returnDate=hon.getDate(SdateTime,SnameTime);
            String returnSalary=hon.getSalary(SdateTime,SnameTime);
            String returnAllowance=hon.getAllowance(SdateTime,SnameTime);

            hon.close();
            Date.setText(returnDate);
            Name.setText(returnName);
            Salary.setText(returnSalary);
            Allowance.setText(returnAllowance);



        }
    });

// HotOrNot.java-->Database class
public class HotOrNot {
    public static final String KEY_DATE = "date";
    public static final String KEY_NAME = "name";
    public static final String KEY_SALARY = "salary";
    public static final String KEY_ALLOWANCE = "allowance";
    private static final String TAG = "DBAdapter";
    private static final String DATABASE_NAME = "MegaLight";
    private static final String TABLE_SALARY = "salary";
    private static final int DATABASE_VERSION = 2;

    private DbHelper ourHelper;
    private final Context ourContext;
    private SQLiteDatabase ourDatabase;
    /*private static final String CREATE_TABLE_SALARY =
    "create table salary (date integer not null, "
    + " name text not null, salary integer not null, allowance integer not null);";
*/
    private static class DbHelper extends SQLiteOpenHelper{



        public DbHelper(Context context) {
            super(context,DATABASE_NAME, null,DATABASE_VERSION);
            // TODO Auto-generated constructor stub
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            // TODO Auto-generated method stub
            String CREATE_TABLE_SALARY = "CREATE TABLE " + TABLE_SALARY+ "("
                    + KEY_DATE + " TEXT, "
                    + KEY_NAME + " TEXT, " 
                    + KEY_SALARY + " INTEGER, "
                    + KEY_ALLOWANCE + " INTEGER " 

                    + ");";


            db.execSQL(CREATE_TABLE_SALARY);

            Log.d(TAG,"salary Table Create Successfull");
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub
            db.execSQL("DROP TABLE IF EXISTS" + TABLE_SALARY);
            onCreate(db);
        }

    }
    public HotOrNot(Context c){
        ourContext=c;
    }
    public HotOrNot open(){
        ourHelper=new DbHelper(ourContext);
        ourDatabase=ourHelper.getWritableDatabase();
        return this;

    }
    public void close(){
        ourHelper.close();


    }
    public long createEntry(String date, String name, String salary,
            String allowance) {
        // TODO Auto-generated method stub
        ContentValues cv=new ContentValues();
        cv.put(KEY_DATE, date);
        cv.put(KEY_NAME, name);
        cv.put(KEY_SALARY, salary);
        cv.put(KEY_ALLOWANCE, allowance);
        return ourDatabase.insert(TABLE_SALARY,null,cv);
    }
    public Cursor getAllContacts() {
        /*String[] columns=new String[]{KEY_DATE, KEY_NAME,KEY_SALARY,KEY_ALLOWANCE};
        Cursor c=ourDatabase.query(TABLE_SALARY, columns, null, null, null,null,null);
        String result=" ";
        int iDate=c.getColumnIndex(KEY_DATE);
        int iName=c.getColumnIndex(KEY_NAME);
        int iSalary=c.getColumnIndex(KEY_SALARY);
        int iAllowance=c.getColumnIndex(KEY_ALLOWANCE);
        for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
            result=result+c.getString(iDate) + "" + c.getString(iName) + "" + c.getString(iSalary) + "" + c.getString(iAllowance) + "\n";

        }
        return result;
        */
        // TODO Auto-generated method stub
        return ourDatabase.query(TABLE_SALARY, new String[] {KEY_DATE, KEY_NAME,KEY_SALARY,KEY_ALLOWANCE}, null, null, null, null, null);
    }
    public String getName(String SdateTime,String SnameTime) {
        // TODO Auto-generated method stub
        String[] columns=new String[]{KEY_DATE,KEY_NAME,KEY_SALARY,KEY_ALLOWANCE};
        Cursor c=ourDatabase.query(TABLE_SALARY,columns,KEY_NAME + "=" + SnameTime + " AND " + KEY_DATE + "=" + SdateTime,null,null,null,null);
    //  Cursor c=ourDatabase.rawQuery("select*from salary where name="+ SnameTime,new String() {"AND date="+SdateTime});
        if(c!=null){
            c.moveToFirst();
            String name=c.getString(1);
            return name;
        }
        return null;
    }
    public String getDate(String SdateTime,String SnameTime) {String[] columns=new String[]{KEY_DATE,KEY_NAME,KEY_SALARY,KEY_ALLOWANCE};
    Cursor c=ourDatabase.query(TABLE_SALARY,columns,KEY_NAME + "=" + SnameTime + " and " + KEY_DATE + "=" + SdateTime,null,null,null,null);
    if(c!=null){
        c.moveToFirst();
        String date=c.getString(0);
        return date;
    }
        // TODO Auto-generated method stub
        return null;
    }
    public String getSalary(String SdateTime,String SnameTime) {
        String[] columns=new String[]{KEY_DATE,KEY_NAME,KEY_SALARY,KEY_ALLOWANCE};
        Cursor c=ourDatabase.query(TABLE_SALARY,columns,KEY_NAME + "=" + SnameTime + " and " + KEY_DATE + "=" + SdateTime,null,null,null,null);
        if(c!=null){
            c.moveToFirst();
            String salary=c.getString(2);
            return salary;
        }
        // TODO Auto-generated method stub
        return null;
    }
    public String getAllowance(String SdateTime,String SnameTime) {
        String[] columns=new String[]{KEY_DATE,KEY_NAME,KEY_SALARY,KEY_ALLOWANCE};
        Cursor c=ourDatabase.query(TABLE_SALARY,columns,KEY_NAME + "=" + SnameTime + " and " + KEY_DATE + "=" + SdateTime,null,null,null,null);
        if(c!=null){
            c.moveToFirst();
            String allowance=c.getString(3);
            return allowance;
        }
        // TODO Auto-generated method stub
        return null;
    }

}

Answer 1

您需要在 Xyz 周围加上单引号，否则 sqlite 会认为您指的是具有该名称的列。

String selection = KEY_NAME + "= '" + name + "'";

或者，您可以在查询字符串中使用 ?，并在 selectionArgs 参数中传递 Xyz。

String selection = KEY_NAME + " = ?";
String[] selectionArgs = new String[] {name};

在这种情况下，您不需要单引号，因为参数是在准备好语句之后绑定的。