Question

我想创建一个数据库，运行LogCat后我得到以下错误：

sqlite返回：错误代码= 1，msg =表位置没有名为Kategorie的列“
字段插槽0的错误请求。 numRows = 52，numColumns = 4“

我的代码如下：

Databasehandler.java

package com.androidhive.androidsqlite;
public class DatabaseHandler extends SQLiteOpenHelper {
// Database Version

private static final int DATABASE_VERSION = 1;

// Database Name
private static final String DATABASE_NAME = "PositionManager";

// Contacts table name
private static final String TABLE_POSITIONS = "positions";

// Contacts Table Columns names
private static final String KEY_ID = "id";

private static final String KEY_NAME = "Name";

private static final String KEY_KATEGORIE = "kategorie";

private static final String KEY_LAENGE = "Laenge";

private static final String KEY_BREITE = "Breite";  

public DatabaseHandler(Context context) {

    super(context, DATABASE_NAME, null, DATABASE_VERSION);

}

// Creating Tables

@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_POSITIONS + "("+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT," + KEY_KATEGORIE + " TEXT," + KEY_LAENGE + " TEXT,"+ KEY_BREITE + " TEXT" + ")";

    db.execSQL(CREATE_CONTACTS_TABLE);
}

// Upgrading database

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // Drop older table if existed
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_POSITIONS);

    // Create tables again
    onCreate(db);
}

/**

 * All CRUD(Create, Read, Update, Delete) Operations

 */

// Adding new contact

void addPosition(Position position) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();

    values.put(KEY_NAME, position.getName()); //  Name

    values.put(KEY_KATEGORIE, position.getkategorie()); //  Kategorie

    values.put(KEY_BREITE, position.getBREITE()); // Breite

    values.put(KEY_BREITE, position.getLAENGE()); // Länge

    // Inserting Row
    db.insert(TABLE_POSITIONS, null, values);

    db.close(); // Closing database connection
}

// Getting single position
Position getPosition(int id) {
    SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.query(TABLE_POSITIONS, new String[] { KEY_ID, KEY_NAME, KEY_KATEGORIE, KEY_LAENGE, KEY_BREITE  }, KEY_ID + "=?", new String[] { String.valueOf(id) }, null, null, null, null);

    if (cursor != null)
        cursor.moveToFirst();

    Position position = new Position(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4));

    // return position
    return position;
}

// Getting All Positions
public List<Position> getAllPositions() {
    List<Position> positionList = new ArrayList<Position>();

    // Select All Query
    String selectQuery = "SELECT  * FROM " + TABLE_POSITIONS;

    SQLiteDatabase db = this.getWritableDatabase();

    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
        do {
            Position position = new Position();
            position.setID(Integer.parseInt(cursor.getString(0)));
            position.setName(cursor.getString(1));
            position.setkategorie(cursor.getString(2));
            position.setLAENGE(cursor.getString(3));
            position.setBREITE(cursor.getString(4));

            // Adding position to list
            positionList.add(position);

        } while (cursor.moveToNext());
    }

    // return position list
    return positionList;
}

// Updating single contact
public int updatePosition(Position position) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();

    values.put(KEY_NAME, position.getName());

    values.put(KEY_KATEGORIE, position.getkategorie());

    values.put(KEY_LAENGE, position.getLAENGE());

    values.put(KEY_BREITE, position.getBREITE());

    // updating row
    return db.update(TABLE_POSITIONS, values, KEY_ID + " = ?", new String[] { String.valueOf(position.getID()) });

}

// Deleting single position
public void deletePosition(Position position) {
    SQLiteDatabase db = this.getWritableDatabase();

    db.delete(TABLE_POSITIONS, KEY_ID + " = ?", new String[] { String.valueOf(position.getID()) });

    db.close();
}

// Getting positions Count
public int getContactsCount() {
    String countQuery = "SELECT  * FROM " + TABLE_POSITIONS;

    SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.rawQuery(countQuery, null);

    cursor.close();

    // return count
    return cursor.getCount();
}
}

AndroidSQLiteTutorialActivity.java

 package com.androidhive.androidsqlite;
public class AndroidSQLiteTutorialActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        DatabaseHandler db = new DatabaseHandler(this);

        /**
         * CRUD Operations
         * */
        // Inserting Positions
        Log.d("Insert: ", "Inserting ..");
        db.addPosition(new Position("Hobbersdorfer Felder", "Landschaft" , "53.94966", "10.70343"));
        db.addPosition(new Position("Felder bei Pelzerhaken", "Landschaft", "54.10039", "10.83878"));
        db.addPosition(new Position("Felder bei Neustadt", "Landschaft" , "54.10713", "10.84201"));
        db.addPosition(new Position("Felder bei Gronenberg", "Landschaft" , "54.04454", "10.69646"));

        // Reading all positions
        Log.d("Reading: ", "Reading all positions..");
        List<Position> positions = db.getAllPositions();       

        for (Position cn : positions) {
            String log = "Id: "+cn.getID()+" ,Name: " + cn.getName() +" ,Kategorie: " + cn.getkategorie() + " ,Länge: " + cn.getLAENGE()+" ,Breite: " + cn.getBREITE();
                // Writing Contacts to log
        Log.d("Name: ", log);

        }
    }
}

Position.java

package com.androidhive.androidsqlite;

public class Position {

//private variables
int _id;
String kategorie;
String name;
String breite;
String laenge;

// Empty constructor
public Position(){

}
// constructor
public Position(int id, String kategorie, String name, String breite, String laenge){
    this._id = id;
    this.kategorie = kategorie;
    this.name = name;
    this.breite = breite;
    this.laenge = laenge;
}

// constructor
public Position(String kategorie, String name, String breite, String laenge){
    this.kategorie = kategorie;
    this.name = name;
    this.breite = breite;
    this.laenge = laenge;
}
// getting ID
public int getID(){
    return this._id;
}

// setting id
public void setID(int id){
    this._id = id;
}

// getting category
public String getkategorie(){
    return this.name;
}

// setting category
public void setkategorie(String kategorie){
    this.kategorie = kategorie;
    }

// getting name
public String getName(){
    return this.name;
}

// setting name
public void setName(String name){
    this.name = name;
}

// getting BREITE
public String getBREITE(){
    return this.breite;
}

// setting BREITE
public void setBREITE(String breite){
    this.breite = breite;

}

// getting LAENGE
public String getLAENGE(){
    return this.laenge;
}
// setting LAENGE
    public void setLAENGE(String laenge){
        this.laenge = laenge;

    }
}

Answer 1

在研究你的代码后，我发现了下一个错误。我不知道它会在你的问题中帮助你，但你应该在接下来纠正：

void addPosition(Position position) {
    SQLiteDatabase db = this.getWritableDatabase();
    // code
    values.put(KEY_BREITE, position.getBREITE()); // Breite

    values.put(KEY_BREITE, position.getLAENGE()); // Länge
    // code
    db.close(); // Closing database connection
}

这里有复制粘贴错误。将KEY_BREITE替换为KEY_LAENGE

错误：“sqlite返回：错误代码= 1，msg =表位置没有名为Kategorie的列”

1 个答案: