Question

我正在尝试使用数据库帮助程序类插入到我的数据库表中这是我创建要插入的对象的地方。

Item item1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    db = new MyDBAdapter(this);

    db.insertEntry(item1 = new Item("Bathtub", "Bathroom", "Typical", "Clean", "fill, wash", "Round, deep", "Bathroom", "Toilet, Bathroom", R.drawable.ic_launcher));
    Log.i("item", "item: " + item1.toString());

这是Item类公共类项目{

//private variables
int    _id;
String _item_name;
String _item_classification;
String _group;
String _use;
String _action;
String _properties;
String _location;
String _association;
int _img_id;

//Empty constructor
public Item(){

}

//constructor
public Item (int _id, String _item_name, String _group, String _item_classification, String _use, String _action, String _properties, String _location, String _association, int _img_id) {
    this._id = _id;
    this._item_name = _item_name;
    this._item_classification = _item_classification;
    this._group = _group;
    this._use = _use;
    this._action = _action;
    this._properties = _properties;
    this._location = _location;
    this._association = _association;
    this._img_id = _img_id;
}

public Item (String _item_name, String _group, String _item_classification, String _use, String _action, String _properties, String _location, String _association, int _img_id) {
    this._item_name = _item_name;
    this._item_classification = _item_classification;
    this._group = _group;
    this._use = _use;
    this._action = _action;
    this._properties = _properties;
    this._location = _location;
    this._association = _association;
    this._img_id = _img_id;

当然使用getter和setter。当我使用insert方法为我的数据库助手时，我得到一个错误，即在“group”附近说语法错误。为什么我的插入失败？

public class MyDBAdapter {
private static final String DATABASE_NAME = "myDatabase.db";
private static final String DATABASE_TABLE = "mainTable";
private static final int DATABASE_VERSION = 1;

//main table columns
public static final String KEY_ITEM              = "item_name";
public static final String KEY_GROUP             = "group";
public static final String ITEM_CLASSIFICATION   = "classification";
public static final String KEY_USE               = "use";
public static final String KEY_ACTION            = "action";
public static final String KEY_PROPERTIES        = "properties";
public static final String KEY_ASSOCIATION       = "association";
public static final String KEY_IMG_ID            = "img_id";

// The index (key) column name for use in where clauses.
public static final String KEY_ID="_id";

// The name and column index of each column in your database.
public static final int NAME_COLUMN = 1;
public static final int GROUP_COLUMN = 2;
public static final int CLASSIFICATION_COLUMN = 3;
public static final int USE_COLUMN = 4;
public static final int ACTION_COLUMN = 5;
public static final int PROPERTIES_COLUMN = 6;
public static final int ASSOCIATION_COLUMN = 7;
public static final int IMG_ID_COLUMN = 8;
// TODO: Create public field for each column in your table.

// SQL Statement to create a new database.
private static final String DATABASE_CREATE = "create table " + 
        DATABASE_TABLE + " (" 
        + KEY_ID + " integer primary key autoincrement, " 
        + KEY_ITEM + " TEXT, " 
        + KEY_GROUP + " TEXT, " 
        + ITEM_CLASSIFICATION + " TEXT, " 
        + KEY_USE + " TEXT, " 
        + KEY_ACTION + " TEXT, " 
        + KEY_PROPERTIES + " TEXT, " 
        + KEY_ASSOCIATION + " TEXT, " 
        + KEY_IMG_ID + " INTEGER);";

// Variable to hold the database instance
private SQLiteDatabase db;
// Context of the application using the database.
private final Context context;
// Database open/upgrade helper
private myDbHelper dbHelper;

public MyDBAdapter(Context _context) {
    context = _context;
    dbHelper = new myDbHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
}

public MyDBAdapter open() throws SQLException {
    try {  
        db = dbHelper.getWritableDatabase();
    } catch (SQLiteException e) {
        db = dbHelper.getReadableDatabase();
    }
    return this;
}

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

public void insertEntry(Item item) {
    // TODO: Create a new ContentValues to represent my row
    // and insert it into the database.
    SQLiteDatabase db = dbHelper.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_ITEM, item.get_item_name());
    values.put(KEY_GROUP, item.get_group());
    values.put(ITEM_CLASSIFICATION, item.get_item_classification());
    values.put(KEY_USE, item.get_use());
    values.put(KEY_ACTION, item.get_action());
    values.put(KEY_PROPERTIES, item.get_properties());
    values.put(KEY_ASSOCIATION, item.get_association());
    values.put(KEY_IMG_ID, item.get_img_id());

    // insert row to table
    try{
        db.insertOrThrow(DATABASE_TABLE, null, values);
    }catch (Exception e){Log.w("insertFail", "insert failed: " + e.toString());}
    db.close();
}

我收到语法错误 - ＆gt; sqlite返回：错误代码= 1，msg =靠近“group”：语法错误

Answer 1

您忘记了列名后面的空格。变化，

private static final String DATABASE_CREATE = "create table " + 
    DATABASE_TABLE + " (" + KEY_ID + 
    " integer primary key autoincrement, " +
    KEY_ITEM + " text not null, " + KEY_GROUP + "TEXT, " + 
    ITEM_CLASSIFICATION + "TEXT, " + KEY_USE + "TEXT, " + 
    KEY_ACTION + "TEXT, " + KEY_PROPERTIES + "TEXT" + 
    KEY_ASSOCIATION + "TEXT," + KEY_IMG_ID + "INTEGER" +  ");";

到

private static final String DATABASE_CREATE = "create table " + 
    DATABASE_TABLE + " (" + KEY_ID + 
    " integer primary key autoincrement, " +
    KEY_ITEM + " text not null, " + KEY_GROUP + " TEXT, " + 
    ITEM_CLASSIFICATION + " TEXT, " + KEY_USE + " TEXT, " + 
    KEY_ACTION + " TEXT, " + KEY_PROPERTIES + " TEXT, " + 
    KEY_ASSOCIATION + " TEXT," + KEY_IMG_ID + " INTEGER" +  ");";

（请注意TEXT和INTEGER之前添加的空格。

Answer 2

您正在创建一个字符串，如：

...integer primary key autoincrement, item_name text not null, groupTEXT, classificationTEXT, useTEXT, actionTEXT, propertiesTEXT...（原文如此）。

看到问题？

Answer 3

我在我的表格中使用“group”来表示我的列名。显然这是一个问题。我猜测“group”是SQLite for android的保留字。因此，如果其他人遇到此问题，请尝试更改列名称。希望这是有帮助的。

将错误插入android sqlite数据库

3 个答案: