Question

我在sqlite中有一些x，y坐标，但是当我添加新数据时，我想检查数据，以及是否有相同的数据覆盖或跳过它。坐标自动来自另一种方法。

public void DBCreate(){
   SQLITEDATABASE = openOrCreateDatabase("LatLongDatabase", Context.MODE_PRIVATE, null);
   SQLITEDATABASE.execSQL("CREATE TABLE IF NOT EXISTS myTable(id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, mCurrentLocationLAT VARCHAR,mCurrentLocationLONG VARCHAR);");
}

public void SubmitData2SQLiteDB(){


    SQLiteQuery = "INSERT INTO myTable (mCurrentLocationLAT, mCurrentLocationLONG) VALUES('"+mCurrentLocation.getLatitude()+"','"+mCurrentLocation.getLongitude()+"');";
    SQLITEDATABASE.execSQL(SQLiteQuery);

    Toast.makeText(CampaignActivity.this,"OK", Toast.LENGTH_LONG).show();
}

Answer 1

如果表具有主键，则使用INSERT或REPLACE，

INSERT OR REPLACE INTO myTable (id, mCurrentLocationLAT, mCurrentLocationLONG) VALUES(1, :lat, :long)

，如果表没有主键，则进行修复。

Answer 2

像这样排列代码，创建了一个新表，但现在总是被覆盖。

 public void DBCreate(){
    SQLITEDATABASE = openOrCreateDatabase("LatLongDatabase", Context.MODE_PRIVATE, null);
    SQLITEDATABASE.execSQL("CREATE TABLE IF NOT EXISTS myTable43(id INTEGER PRIMARY KEY AUTOINCREMENT, FAVCurrentLocationLAT VARCHAR,FAVCurrentLocationLONG VARCHAR);");
}
public void SubmitData2SQLiteDB(){
    SQLiteQuery = "INSERT OR REPLACE  INTO myTable43(id, FAVCurrentLocationLAT, FAVCurrentLocationLONG) VALUES(1, '"+mCurrentLocation.getLatitude()+"','"+mCurrentLocation.getLongitude()+"');";
        SQLITEDATABASE.execSQL(SQLiteQuery);
        Toast.makeText(CampaignActivity.this,"OK", Toast.LENGTH_LONG).show();
}

SQLite是否存在现有数据跳过或覆盖

2 个答案: