當我嘗試通過使用'Washing Machine'作爲搜索字符串來搜索我的數據庫以查找'Washing Machine'的數據庫條目時,出現一個錯誤消息:語法在數據庫搜索條目時出錯
04-16 21:43:28.951: E/AndroidRuntime(545): FATAL EXCEPTION: main
04-16 21:43:28.951: E/AndroidRuntime(545): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lukeorpin.theappliancekeeper/com.lukeorpin.theappliancekeeper.EntryStatis tics}: android.database.sqlite.SQLiteException: near "Machine": syntax error: , while compiling: SELECT _id, appliance_name, appliance_wattage, energy_rates FROM ApplianceDetails WHERE appliance_name=Washing Machine
,更具體地:
at com.lukeorpin.theappliancekeeper.Database.getWattage(Database.java:122)
04-16 21:43:28.951: E/AndroidRuntime(545): at com.lukeorpin.theappliancekeeper.EntryStatistics.onCreate(EntryStatistics.java:47)
這裏是數據庫的搜索查詢代碼:
public String getWattage(String spinnerChoice) {
// TODO Auto-generated method stub
String[] columns = new String[] { KEY_ROWID, KEY_NAME, KEY_WATTAGE, KEY_ENERGY};
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_NAME + "=" + spinnerChoice, null, null, null, null);
if (c != null){
c.moveToFirst();
String wattage = c.getString(2);
return wattage;
}
return null;
}
public String getEnergyRate(String spinnerChoice) {
// TODO Auto-generated method stub
String[] columns = new String[] { KEY_ROWID, KEY_NAME, KEY_WATTAGE, KEY_ENERGY};
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_NAME + "=" + spinnerChoice, null, null, null, null);
if (c != null){
c.moveToFirst();
String energyRate = c.getString(3);
return energyRate;
}
return null;
}
而這正是該方法創建原始類:
final String spinnerChoice = getIntent().getStringExtra("Name");
if(spinnerChoice==null){
return;
}
Database data = new Database(this);
data.open();
String returnedWattage = data.getWattage(spinnerChoice);
String returnedEnergyRate = data.getEnergyRate(spinnerChoice);
data.close();
任何人都不會有爲什麼這個錯誤信息出現的任何想法?由於
編輯:這裏是代碼的錯誤指向太行(行122):
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_NAME + "=" + spinnerChoice, null, null, null, null);
您能顯示導致錯誤的實際sql命令字符串嗎? – 2012-04-16 21:54:18
我已經把它放在原帖的末尾,謝謝 – Sketzii 2012-04-16 21:57:14
我希望你已經做了一些調試,並且可以將原始字符串值拉出來讓我們看看:) – 2012-04-16 22:01:44