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我一直在嘗試這個很長一段時間，我的大腦已經疲憊不堪。我試圖通過微調，無線電和edittext獲得用戶輸入。以下是我的主要活動代碼，其中獲取所有輸入。sqlite異常插入時
public class SQLiteActivity extends Activity implements AdapterView.OnItemSelectedListener, RadioGroup.OnCheckedChangeListener {
private String crop;
private String flowrate;
private String soil;
private String threshold;
private String limit;
SqliteHelper sqliteHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shared);
crop = "";
flowrate = "";
soil = "";
threshold="";
limit="";
Spinner spinnerZodiac = (Spinner) findViewById(R.id.spinnerZodiac);
spinnerZodiac.setOnItemSelectedListener(this);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.soil, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerZodiac.setAdapter(adapter);
RadioGroup radioGroupGender = (RadioGroup) findViewById(R.id.radioGroupFlowrate);
radioGroupGender.setOnCheckedChangeListener(this);
sqliteHelper = new SqliteHelper(this);
}
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
int radioButtonId = radioGroup.getCheckedRadioButtonId();
RadioButton radioButton = (RadioButton)radioGroup.findViewById(radioButtonId);
flowrate = radioButton.getText().toString();
}
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
soil = parent.getItemAtPosition(position).toString();
}
public void onNothingSelected(AdapterView<?> parent) {
// An interface callback
}
public void save(View view) {
crop = ((EditText)findViewById(R.id.txtCrop)).getText().toString();
threshold = ((EditText)findViewById(R.id.txtThreshold)).getText().toString().trim();
limit= ((EditText)findViewById(R.id.txtLimit)).getText().toString().trim();
if (crop.isEmpty()){
Toast.makeText(getApplicationContext(), "Crop type cannot be empty!", Toast.LENGTH_LONG).show();
return;
}
boolean result = sqliteHelper.saveUser(crop, flowrate, soil,threshold,limit);
if (result){
Toast.makeText(getApplicationContext(), "You have been saved!", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Failed to save!", Toast.LENGTH_LONG).show();
}
}
public void retrieve(View view) {
crop = ((EditText)findViewById(R.id.txtCrop)).getText().toString();
Cursor cursor = sqliteHelper.getUser(crop);
if (cursor.getCount() != 0) {
cursor.moveToFirst();
crop = cursor.getString(cursor.getColumnIndex("crop"));
flowrate= cursor.getString(cursor.getColumnIndex("flowrate"));
soil = cursor.getString(cursor.getColumnIndex("soil"));
threshold=cursor.getString(cursor.getColumnIndex("threshold"));
limit=cursor.getString(cursor.getColumnIndex("limit"));
if (!cursor.isClosed()) {
cursor.close();
}
setUI();
}
}
protected void setUI(){
((TextView)findViewById(R.id.txtCrop)).setText(crop);
if (flowrate.equals("50")){
((RadioButton)findViewById(R.id.radMale)).setChecked(true);
} else if (flowrate.equals("60")){
((RadioButton)findViewById(R.id.radFemale)).setChecked(true);
}
Resources resource = getResources();
String[] zodiacArray = resource.getStringArray(R.array.soil);
for(int i = 0; i < zodiacArray.length; i++){
if(zodiacArray[i].equals(soil)){
((Spinner)findViewById(R.id.spinnerZodiac)).setSelection(i);
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.sqlite, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
下面是保存在SQLite數據庫中輸入的內容的功能（sqlitehelper類）
public boolean saveDetail(String crop, String flowrate,String soil,String threshold,String limit)
{
Cursor cursor = getUser(crop);
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("flowrate", flowrate);
contentValues.put("soil", soil);
contentValues.put("threshold", threshold);
contentValues.put("limit", limit);
long result;
if (cursor.getCount() == 0) {
contentValues.put("crop", crop);
result = db.insert("configuration", null, contentValues);
} else {
result = db.update("configuration", contentValues, "crop=?", new String[] { crop });
}
if (result == -1) {
return false;
} else {
return true;
}
}
public Cursor getDetail(String crop){
SQLiteDatabase db = this.getReadableDatabase();
String sql = "SELECT * FROM configuration WHERE crop=?";
return db.rawQuery(sql, new String[] { crop });
}
但在執行它拋出一個異常說
Error inserting crop=tea threshold=10 soil=Alluvial limit=20 flowrate=15
android.database.sqlite.SQLiteException: near "limit": syntax error (code 1): , while compiling: INSERT INTO configuration(crop,threshold,soil,limit,flowrate) VALUES (?,?,?,?,?)
非常感謝您答案。我將變量名更改爲綁定，現在它不顯示該錯誤。但我得到了另一個。
Error inserting crop=un threshold=11 bound=111 soil=Alluvial flowrate=50
android.database.sqlite.SQLiteException: table configuration has no column named threshold (code 1): , while compiling: INSERT INTO configuration(crop,threshold,bound,soil,flowrate) VALUES (?,?,?,?,?)
查看您的查詢和異常消息，「limit」是用於限制SELECT語句返回的數據量的SQLite關鍵字。這就是爲什麼你得到一個例外。它與您的專欄名稱發生衝突。例如，將列名更改爲mylimit，它將起作用。 – saeed
謝謝Saeed！這是一個完美的答案。但是，我通過編輯帖子發現了另一個錯誤。 – Shrei
在你的數據庫沒有這樣的colom名稱作物是錯誤 – saeed