数据未插入SQLite数据库

时间:2016-09-14 17:42:06

标签: android android-sqlite

我正在创建一个应用程序,但是当我去插入一些数据时,它不起作用。这是我的应用程序的screenshot,包括错误消息。这是我的database课程:

public class database extends SQLiteOpenHelper {
    public static final String DATABASE_NAME = "STUDENT";
    public static final String TABLE_NAME = "TRIP";
    public static final String COL1 = "ID";
    public static final String COL2 = "NAME";
    public static final String COL3 = "CURRENT";
    public static final String COL4 = "DESTINATION";
    public static final String COL5 = "BUDGET";
    public database(Context context) {
        super(context, DATABASE_NAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table if not exists " + TABLE_NAME + "(" + COL1 + " INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,CURRENT TEXT,DESTINATION TEXT,BUDGET INTEGER )");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("drop table if exists " + TABLE_NAME);
        onCreate(db);
    }
    public void insertdata(String name,String current,String destination,String budget)
    {
        SQLiteDatabase db=this.getWritableDatabase();
        db.execSQL("insert into TRIP(NAME,CURRENT,DESTINATION,BUDGET)values('" + name + "','" + current + "','" + destination + "',"+Integer.parseInt(budget)+")");
    }
}

有关如何解决此问题的任何建议?

1 个答案:

答案 0 :(得分:1)

尝试使insertdata函数返回long。将insertdata函数替换为以下函数:

public long insertdata(String name, String current, String destination, String budget) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues contentValues = new ContentValues();
    contentValues.put(COL2, name);
    contentValues.put(COL3, current);
    contentValues.put(COL4, destination);
    contentValues.put(COL5, budget);

    return db.insert(TABLE_NAME, null, contentValues);
}

在您插入数据的活动中,请确保按以下方式调用此函数:

database db = new database(this);

if (db.insertdata("name", "current", "destination", "budget") > 0)
    // do something else here

如果您仍遇到同样的问题,请卸载您的应用并重试。如果它仍然无法正常工作,请随时在下面发表评论。