当我尝试通过使用'Washing Machine'作为搜索字符串来搜索我的数据库以查找'Washing Machine'的数据库条目时,出现一个错误消息:语法在数据库搜索条目时出错
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
,更具体地:
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)
这里是数据库的搜索查询代码:
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;
}
而这正是该方法创建原始类:
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();
任何人都不会有为什么这个错误信息出现的任何想法?由于
编辑:这里是代码的错误指向太行(行122):
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_NAME + "=" + spinnerChoice, null, null, null, null);
您能显示导致错误的实际sql命令字符串吗? – 2012-04-16 21:54:18
我已经把它放在原帖的末尾,谢谢 – Sketzii 2012-04-16 21:57:14
我希望你已经做了一些调试,并且可以将原始字符串值拉出来让我们看看:) – 2012-04-16 22:01:44