创建提供语法错误的sqlite数据库时出错

Question

我正在使用android联系人列表应用程序，我刚刚开始在android平台上进行开发，在我的联系人列表应用程序中，我必须创建一个sqlite数据库表来存储联系人，但我在创建sqlite数据库时遇到了困难，这给我的logcat一个错误窗口，例如：“ Logcat显示这些错误” sqlite返回：错误代码= 1，msg =附近“，”语法错误“准备'CREATE TABLE Places（ID INT PRIMARY）时在0x1f14d0上出​​现故障1（在”，“附近：语法错误） KEY NOT NULL，名称TEXT NOT NULL，电话TEXT NOT NULL，地址TEXT NOT NULL，网站TEXT，HOME TEXT NOT NULL，'FATAL EXCEPTION：main“ java.lang.RuntimeException：无法启动活动ComponentInfo {com.webpreneur_contactlist / com .webpreneur_contactlist.WebpreneurActivity}：java.lang.IllegalStateException：数据库未打开”，请帮助我

public class DBHandler extends SQLiteOpenHelper{

    private static final int DB_Version = 1;

    private static final String DB_Name = "Places";

    protected static final String Places_Table = "Places";

    String name, Address, Website,ID;
    //WebpreneurActivity Contact;
 public static final String Key_ID = "ID";
 public static final String Key_Name = "Name";
 public static final String Key_Phone = "Phone";
 public  static final String Key_Address = "Address";
public static final String Key_Website = "Website";
public  static final String Key_Home = "HOME";
public static final String PROJECTION[] = {
    Key_ID,
    Key_Name,
    Key_Address,
    Key_Phone,
    Key_Home
};

    String CREATE_PLACES_TABLE = "create table if not exists Places_Table (id integer primary key ,"+
            "name VARCHAR not null, phone VARCHAR not null, address VARCAHR not null, website VARCHAR not null,Home VARCHAR not null)";

    Context context;
    SQLiteDatabase db;

    public DBHandler(Context context) {

        super(context, DB_Name, null, DB_Version);
        Log.d("database1" ,"4");
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        try{
            Log.d("DB", "DB creationnewwwww");
                db.execSQL("CREATE TABLE  " + Places_Table + "(" +
                        Key_ID + " INT PRIMARY KEY NOT NULL," +
                        Key_Name + " TEXT NOT NULL," +
                        Key_Phone + " TEXT NOT NULL," +
                        Key_Address + " TEXT NOT NULL," +
                        Key_Website + " TEXT," +
                        Key_Home + " TEXT,");
                Log.d("DB", "DB creationnewwwwwwwwwwwwwwwwwwwwwwwwwww");
        }
        catch(SQLiteException e){
            Log.d("DB", "DB creation excptionhhhhhhhhhhhhhhh");
            e.printStackTrace();
        }

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub

        db.execSQL("Drop Table If Exists" + Places_Table);
        onCreate(db);
    }



    public DBHandler open()
    {Log.d("DB", "DB creation 9");
     db = this.getWritableDatabase();
        onCreate(db);
    Log.d("DB", "DB creation 9");
    return this;
    }
    public void close()
    {
        db.close();

    }

    //Adding Places 
    void addPlaces( int id, String name,String phone, String address,String url){

        Log.d("DB", "DB creation 1");
        //SinglePlaceActivity single = new SinglePlaceActivity();   Log.d("DB", "DB creation 2");
        ContentValues contentValues = new ContentValues();
        Log.d("DB", "DB creation 3");
        contentValues.put(Key_ID, id);
        Log.d("DB", "DB creation 4");
        contentValues.put(Key_Name, name);
        contentValues.put(Key_Phone, phone);
        contentValues.put(Key_Address, address);
        contentValues.put(Key_Website, url);
        Log.d("DB", "DB creation 4");
        db.insert(Places_Table, null, contentValues);
        Log.d("DB", "DB creation 5555");
        //db.close();
    }

    public String getdata() {
        // TODO Auto-generated method stub
        String [] columns =new String[]{Key_ID ,Key_Name,Key_Address,Key_Website};
        Cursor c =db.query(DB_Name, columns, null, null, null, null, null);
        String Result=""; 
        int iRow=c.getColumnIndex(Key_ID);
        int iName=c.getColumnIndex(Key_Name);
        int iAddress=c.getColumnIndex(Key_Address);
        int iWebsite=c.getColumnIndex(Key_Website);
        for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
            Result=Result+c.getString(iRow)+"    "+c.getString(iName)+ "  "+c.getString(iAddress)+ "   "+c.getString(iWebsite)+ "\n";
        }

        return Result;
    }   


    public void createRow(String name, String address, String Phone, String home)
    {
        ContentValues initialValues = new ContentValues();
        initialValues.put(Key_Name, name);
        initialValues.put(Key_Address, address);
        initialValues.put(Key_Phone, Phone);
        initialValues.put(Key_Home, home);
                //pass the initialValues to the database to insert the row
        db.insert(Places_Table, null, initialValues);
    }

        public void deleteRow(long rowId){
        db.delete(Places_Table, Key_ID+"="+rowId,null);
    }

        public boolean updateRow (long rowId, String name, String address, String Phone, String home){
        ContentValues args = new ContentValues();
        args.put(Key_Name, name);
        args.put(Key_Address, address);
        args.put(Key_Phone, Phone);
        args.put(Key_Home, home);
        return db.update(Places_Table, args, Key_ID +"="+ rowId, null)>0;
    }
        public Cursor fetchRow(long rowId) throws SQLException{
            Cursor result = db.query( Places_Table, null, 
                    Key_ID + "=" + rowId, null, null, null,null);
            if ((result.equals(rowId)) || !result.isFirst()) {
                throw new SQLException("No note matching ID: " + rowId);
            }
            return result;
        }

        public Cursor fetchAllRows(){
            Log.d("Your Location4", "ok99:");
            return db.query(Places_Table, PROJECTION, 
                    null, null, null, null, null);

        }
}

Answer 1

更换

Key_Home + " TEXT,");

与

Key_Home + " TEXT)");

有一个,因此可以期待更多的列规范，但没有后续内容，因此您需要使用)终止表规范。

另外，您不应该在数据库助手onCreate()捕获SQLiteException 。 当onCreate()正常返回时，假定数据库创建成功。

解决问题之后，请卸载您的应用程序，以便删除不正确的旧数据库文件，并再次运行onCreate() 。

同样在open()您似乎自己调用了onCreate() 。 不要那样做 get{Read,Writ}ableDatabase()会在需要时为您完成。

Answer 2

您没有关闭SQL语句。 例如：

这个：

db.execSQL("CREATE TABLE  " + Places_Table + "(" +
                    Key_ID + " INT PRIMARY KEY NOT NULL," +
                    Key_Name + " TEXT NOT NULL," +
                    Key_Phone + " TEXT NOT NULL," +
                    Key_Address + " TEXT NOT NULL," +
                    Key_Website + " TEXT," +
                    Key_Home + " TEXT,");

应该：

db.execSQL("CREATE TABLE  " + Places_Table + "(" +
                    Key_ID + " INT PRIMARY KEY NOT NULL," +
                    Key_Name + " TEXT NOT NULL," +
                    Key_Phone + " TEXT NOT NULL," +
                    Key_Address + " TEXT NOT NULL," +
                    Key_Website + " TEXT," +
                    Key_Home + " TEXT)");

然后将关闭create table语句。 由于逗号，它正在期待另一个参数。