如何在使用遊標查詢時解決sqlite中的語法異常？

Question

在我的項目，我用這遊標查詢：

Cursor c = db.query(VivzHelper.TX_TABLE, columns, helper.TX_ID + "='" + name + "' AND " + helper.TX_DATE + " BETWEEN '"+ datefrom.from_date + "' AND '" + dateto.to_date + "' AND '"+ helper.TX_TYPE +" = '"+"DM", null, helper.TX_NAME, null, null); 

我得到了我上面的查詢以下異常：

android.database.sqlite.SQLiteException: near "DM": syntax error (code 1): , while compiling: SELECT _id, txname, SUM(amount) AS amount, date, txtype FROM transactions WHERE txid='E' AND date BETWEEN '2015-09-06' AND '2015-09-06' AND 'txtype = 'DM GROUP BY txname 

Answer 1

請參見本部分：

AND 'txtype = 'DM GROUP BY txname 

應：

AND txtype = 'DM' GROUP BY txname 

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的錯誤是在這裏：

AND '"+ helper.TX_TYPE +" = '"+"DM", null, 

應該是：

Cursor c = db.query(VivzHelper.TX_TABLE, columns, helper.TX_ID + "='" + name + "' AND " + helper.TX_DATE + " BETWEEN '"+ datefrom.from_date + "' AND '" + dateto.to_date + "' AND '"+ helper.TX_TYPE +" = '"+"DM", null, helper.TX_NAME, null, null); 

這樣：：

AND "+ helper.TX_TYPE +" = 'DM'", null, 

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所以，從這個解決您的rawQuery

Cursor c = db.query(VivzHelper.TX_TABLE, columns, helper.TX_ID + "='" + name + "' AND " + helper.TX_DATE + " BETWEEN '"+ datefrom.from_date + "' AND '" + dateto.to_date + "' AND "+ helper.TX_TYPE +" = 'DM'", null, helper.TX_NAME, null, null); 

[編輯]

使用約束參數（AKA selectionArgs兩個）將幫助你擺脫字符串分隔符：

Cursor c = db.query(VivzHelper.TX_TABLE, columns, helper.TX_ID + " = ? AND " + helper.TX_DATE + " BETWEEN ? AND ? AND "+ helper.TX_TYPE + " = ?", new String[]{name, datefrom.from_date, dateto.to_date, "DM"}, helper.TX_NAME, null, null);