Question

如何在不使用 ROW_ID 的情况下制作UPDATE功能。由于某些原因，SQL表中的 ROW_ID 给了我多个错误。没有它，它的工作完美。我需要的是如何使用另一个约束在更新中使用where参数，例如假设，注册号。

public class Work {

public static final String KEY_NAME = "name";
public static final String KEY_REG = "reg";
public static final String KEY_QUIZ1 = "q1";
public static final String KEY_QUIZ2 = "q2";
public static final String KEY_QUIZ3 = "q3";
public static final String KEY_CAT1 = "c1";
public static final String KEY_CAT2 = "c2";
public static final String KEY_TEE = "t";

private DbHelper ourHelper;
private final Context ourContext;
private static SQLiteDatabase ourDatabase;

private static final String DATABASE_NAME = "data";
private static final String DATABASE_TABLE = "stable";
private static final int DATABASE_VERSION = 1;

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
        db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
                KEY_REG + " TEXT, " + 
                KEY_NAME + " TEXT, " +
                KEY_QUIZ1 + " TEXT, " +
                KEY_QUIZ2 + " TEXT, " +
                KEY_QUIZ3 + " TEXT, " +
                KEY_CAT1 + " TEXT, " +
                KEY_CAT2 + " TEXT, " +
                KEY_TEE + " TEXT);"

                );
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TBALE IF EXISTS " + DATABASE_TABLE);
        onCreate(db);
    }
}
public Work(Context c){
    ourContext = c;

}

public Work open() throws SQLException{
    ourHelper = new DbHelper(ourContext);
    ourDatabase = ourHelper.getWritableDatabase();
    return this;

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

public long createEntry(String string, String string2, String string3, String string4, String string5, String string6, String string7, String string8) {
    // TODO Auto-generated method stub
    ContentValues cv = new ContentValues();
    cv.put(KEY_REG, string);
    cv.put(KEY_NAME, string2);
    cv.put(KEY_QUIZ1, string3);
    cv.put(KEY_QUIZ2, string4);
    cv.put(KEY_QUIZ3, string5);
    cv.put(KEY_CAT1, string6);
    cv.put(KEY_CAT2, string7);
    cv.put(KEY_TEE, string8);
    return ourDatabase.insert(DATABASE_TABLE, null, cv);

}

public String getq1(int j) {
    // TODO Auto-generated method stub
    int i=0;
    String[] columns = new String[]{KEY_REG, KEY_NAME, KEY_QUIZ1, KEY_QUIZ2, KEY_QUIZ3, KEY_CAT1, KEY_CAT2, KEY_TEE};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String res = "";
    int iQ1=c.getColumnIndex(KEY_QUIZ1);
    for(c.moveToFirst();i<j && !c.isAfterLast();i++,c.moveToNext())
    {}  
    res = c.getString(iQ1);
    return res;
}

public String getq2(int j) {
    // TODO Auto-generated method stub
    int i=0;
    String[] columns = new String[]{KEY_REG, KEY_NAME, KEY_QUIZ1, KEY_QUIZ2, KEY_QUIZ3, KEY_CAT1, KEY_CAT2, KEY_TEE};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String res = "";

    int iQ1=c.getColumnIndex(KEY_QUIZ2);
    for(c.moveToFirst();i<j && !c.isAfterLast();i++,c.moveToNext())
    {}  
    res = c.getString(iQ1);
    return res;
}

public String getq3(int j) {
    // TODO Auto-generated method stub
    int i=0;
    String[] columns = new String[]{KEY_REG, KEY_NAME, KEY_QUIZ1, KEY_QUIZ2, KEY_QUIZ3, KEY_CAT1, KEY_CAT2, KEY_TEE};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String res = "";

    int iQ1=c.getColumnIndex(KEY_QUIZ3);
    for(c.moveToFirst();i<j && !c.isAfterLast();i++,c.moveToNext())
    {}  
    res = c.getString(iQ1);
    return res;
}

public String getc1(int j) {
    // TODO Auto-generated method stub
    int i=0;
    String[] columns = new String[]{ KEY_REG, KEY_NAME, KEY_QUIZ1, KEY_QUIZ2, KEY_QUIZ3, KEY_CAT1, KEY_CAT2, KEY_TEE};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String res = "";

    int iQ1=c.getColumnIndex(KEY_CAT1);
    for(c.moveToFirst();i<j && !c.isAfterLast();i++,c.moveToNext())
    {}  
    res = c.getString(iQ1);
    return res;
}

public String getc2(int j) {
    // TODO Auto-generated method stub
    int i=0;
    String[] columns = new String[]{ KEY_REG, KEY_NAME, KEY_QUIZ1, KEY_QUIZ2, KEY_QUIZ3, KEY_CAT1, KEY_CAT2, KEY_TEE};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String res = "";

    int iQ1=c.getColumnIndex(KEY_CAT2);
    for(c.moveToFirst();i<j && !c.isAfterLast();i++,c.moveToNext())
    {}  
    res = c.getString(iQ1);
    return res;
}

public String gette(int j) {
    // TODO Auto-generated method stub
    int i=0;
    String[] columns = new String[]{KEY_REG, KEY_NAME, KEY_QUIZ1, KEY_QUIZ2, KEY_QUIZ3, KEY_CAT1, KEY_CAT2, KEY_TEE};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String res = "";
    int iQ1=c.getColumnIndex(KEY_TEE);
    for(c.moveToFirst();i<j && !c.isAfterLast();i++,c.moveToNext())
    {}  
    res = c.getString(iQ1);
    return res;
}

public String getData() {
    // TODO Auto-generated method stub
    String[] columns = new String[]{KEY_REG, KEY_NAME, KEY_QUIZ1, KEY_QUIZ2, KEY_QUIZ3, KEY_CAT1, KEY_CAT2, KEY_TEE};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String res = "";
    int ireg=c.getColumnIndex(KEY_REG);
    int ina=c.getColumnIndex(KEY_NAME);
    int iQ1=c.getColumnIndex(KEY_QUIZ1);
    int iQ2=c.getColumnIndex(KEY_QUIZ2);
    int iQ3=c.getColumnIndex(KEY_QUIZ3);
    int ic1=c.getColumnIndex(KEY_CAT1);
    int ic2=c.getColumnIndex(KEY_CAT2);
    int it=c.getColumnIndex(KEY_TEE);

    for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext())
    {
        res+=c.getString(ireg)+"  "+c.getString(ina)+"  "+c.getString(iQ1)+"  "+c.getString(iQ2)+"  "+c.getString(iQ3)+"  "+c.getString(ic1)+"  "+c.getString(ic2)+"  "+c.getString(it)+"\n";
    }

    return res;
}



public void updateEntry(int j, String g1, String g2, String g3, String g4,
        String g5, String g6) {
    // TODO Auto-generated method stub

    ContentValues cvup= new ContentValues();
    cvup.put(KEY_QUIZ1, g1);
    cvup.put(KEY_QUIZ2, g2);
    cvup.put(KEY_QUIZ3, g3);
    cvup.put(KEY_CAT1, g4);
    cvup.put(KEY_CAT2, g5);
    cvup.put(KEY_TEE, g6);
    ourDatabase.update(DATABASE_TABLE, cvup, WHERE, null);

}

}

Answer 1

更新语句的WHERE子句在哪里

ourDatabase.update(DATABASE_TABLE, cvup, WHERE, null);

为您提供样本更新条款：

public boolean updateContact (Integer id, String name, String phone, String email)
{
  SQLiteDatabase db = this.getWritableDatabase();
  ContentValues contentValues = new ContentValues();
  contentValues.put("name", name);
  contentValues.put("phone", phone);
  contentValues.put("email", email);

  db.update("contacts", contentValues, "id = ? ", new String[] { Integer.toString(id) } );
  return true;
}

请参阅here。

更新使用

private static final String DATABASE_NAME = "data.db"; //You forgot .db

不使用ROW_ID更新SQL数据库

1 个答案: