Question

我遇到的SELECT查询问题没有返回任何值，但如果我输入一个真正的字符串而不是一个变量就可以了

db.returnArray（＆＃34;您好＆＃34）; //这个有用吗

db.returnArray（ChecklistName）; //这不起作用

这是代码。

    private void shareChecklist(String CheckListName) {
    // TODO Auto-generated method stub
    /** sharing code is working but the problem with how to get the item =) */

    //Build the Share Content 
    String shareBody=sCheckList+ " item/s: \n";

        db = new SQLiteDB(this.getApplicationContext());
    String[] printItem =db.returnArray(CheckListName);

    for(int j=0;j<printItem.length;j++){
        shareBody+=printItem[j]+" \n";
    }

    //Create a Send Intent
    Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND); 

    //Set the Sharing Type
     sharingIntent.setType("text/plain");

    //Pass Content to the Intent
        sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, sCheckList+" Check list,I am sharing one of my Check list On Voz App");
        sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);

    //Create a Chooser
    startActivity(Intent.createChooser(sharingIntent, "Share via"));    
}

SQLiteDataBase代码：

     /*** Table ****/
    private static final String TABLE_ITEMS = "items";
private static final String ITEM_ID = "id";
private static final String ITEM_CHECKLISTIDX = "checklistName";
private static final String ITEM_NAME = "itemname";
private static final String ITEM_FLAG = "flag";
private static final String ITEM_DATETIME = "esttime";
private static final String[] ITEMCOLUMNS = { ITEM_ID, ITEM_CHECKLISTIDX,
        ITEM_NAME, ITEM_FLAG, ITEM_DATETIME };
   /*************************************************************/

    /** return an array with items from items table ***/
     public String[] returnArray(String checkName){

    String[] items;
    SQLiteDatabase db = this.getWritableDatabase();
    String query="SELECT * FROM items WHERE checklistName='"+ checkName + "'";
    Cursor cursor = db.rawQuery(query, null);
    items=new String[cursor.getCount()];
    int counter=0;

      if (cursor.moveToFirst()) {
            do {
                items[counter++]+= cursor.getString(2);
            } while (cursor.moveToNext());
            db.close();
      } 
     return items;
}

创建表格为：

String CREATE_ITEM_TABLE = "CREATE TABLE items ( "+ "id INTEGER PRIMARY KEY AUTOINCREMENT  , " + "checklistName TEXT, "+ "itemname TEXT, " + "flag INTEGER, " + "esttime TEXT )";
db.execSQL(CREATE_ITEM_TABLE);

Answer 1

您在SELECT中定位了错误的字段由于您要创建此字段：

checklistidx

在你的：

String CREATE_ITEM_TABLE = "CREATE TABLE items ( "+ "id INTEGER PRIMARY KEY AUTOINCREMENT  , " + "checklistidx TEXT, "+ "itemname TEXT, " + "flag INTEGER, " + "esttime TEXT )";

您选择的WHERE应该定位该字段：

String query="SELECT * FROM items WHERE checklistidx = '"+ checkName + "'";

而不是

String query="SELECT * FROM items WHERE checklistName = '"+ checkName + "'";

选择查询不起作用 - Android Sqlite

1 个答案: