Question

以下是用于创建表格访问者以存储名称和地点地址的数据库编码

公共课DbFav {

/** for database */
static final String DataBaseName = "Favdb";

 /** for register table */
static final String favtable = "Visiters";
static final String VisitID = "visitid";


 static   final  String ColNam="Name";

static   final  String ColAdd="Address";


public static final int DATABASE_VERSION = 3;


private static final String REGISTER_TABLE_CREATE ="Create table " + favtable + "("+VisitID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + ColNam+ " VARCHAR(15)," + ColAdd+ " VARCHAR(15)) ";
private final Context context;  //for  the  linkage  of  the  database  wid  the  app
private DatabaseHelper DBHelper;
private SQLiteDatabase db;

public DbFav(Context ctx){
    Log.i("test****", "**test***");
    this.context = ctx;   
    DBHelper = new DatabaseHelper(context);
}
    private static class DatabaseHelper extends SQLiteOpenHelper{
    public DatabaseHelper(Context context){

        //super(context, DataBaseName , null, DATABASE_VERSION);
        super(context, DataBaseName, null, DATABASE_VERSION);
        Log.i("context","context");
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL(REGISTER_TABLE_CREATE);
        //db.execSQL(SEARCH_TABLE_CREATE);
        Log.i("************", "table created");
    }



    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { //for update
        // TODO Auto-generated method stub
        Log.w("tag", "Upgrading database from version " + oldVersion + " to "+ newVersion + ", which will destroy all old data");
        db.execSQL("DROP TABLE IF EXISTS " + favtable);

        onCreate(db);
    }

}

public DbFav open() throws SQLException{
    db = DBHelper.getWritableDatabase();
    Log.i("open", "message");
    return this;
}
public void close(){
    DBHelper.close();
}


public long insert(String Name,String Address ) {
    Log.i("**** suruchitest **** ","*** test ***");

    ContentValues initialValues = new ContentValues();


    initialValues.put(ColNam,Name); //key , value
    initialValues.put(ColAdd,Address);
    Log.i("Values Inserted","Values are inserted");
    return db.insert(favtable, null, initialValues);

从以下编码保存到数据库的值，其中访问者的例外不包含名为（名称，地址）的列

get_place=trname.getText().toString();
get_add=tradd.getText().toString();
db.open();
db.insert(get_place,get_add);
db.close();

Error inserting Name=KT Royal Hotel Sangrur Address=Nankiana Chowk, Patiala Bypass Road, Sangrur, Punjab 148001, India
android.database.sqlite.SQLiteDatatypeMismatchException: datatype mismatch (code 20)

Answer 1

错误状态

[INSERT INTO Visiters（名称，地址）VALUES（？，？）]数据类型不匹配

您已将Name INTEGER PRIMARY KEY AUTOINCREMENT定义为整数，并尝试在表格中插入字符串。

public long insert(String Name,String Address) {
    [...]
    initialValues.put(ColNam,Name); // Name should be an int
    [...]
}

您需要正确定义表格。

注意：在对SQL方案进行更改后，不要忘记删除数据以进行测试。

此外，您应该使用TEXT代替VARCHAR(15)。

SQLite不会施加任何长度限制

将值插入SQLite DB时出错？有人能解决这个问题吗？

1 个答案: