我知道有很多关于这个问题的线索，但没有我自己的问题。 我在数据库中连接了一个微调器，显示特定表的外键。并且它似乎插入错误。
02-18 11:44:34.500: E/SQLiteDatabase(20811): Error inserting ConsumerName=android.database.sqlite.SQLiteCursor@4144fa58 kWh=801.0 _id=65324 Date=2013 -2-18 Previous=98 Current=899
02-18 11:44:34.500: E/SQLiteDatabase(20811): android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed
public class ElectricMeterReader extends Activity {
private long rowID;
private EditText meterNoEt;
private EditText currentEt;
private EditText previousEt;
private EditText kWhEt;
private TextView dateTv;
private Spinner spinner;
private int mSpinnerSpeciesId;
private ElectricMeterReader mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.electric_meter_reader);
Bundle extras = getIntent().getExtras();
// rowID = extras.getLong(ConsumerList.ROW_ID);
dateTv = (TextView) findViewById(R.id.dateEmr);
meterNoEt = (EditText) findViewById(R.id.meterNumberEmr);
currentEt = (EditText) findViewById(R.id.currentReadingEmr);
previousEt = (EditText) findViewById(R.id.passReadingEmr);
kWhEt = (EditText) findViewById(R.id.kwhEmr);
spinner = (Spinner) findViewById(R.id.spinner);
// Loading spinner data from database
SQLiteDatabase db = new DatabaseOpenHelper(this).getWritableDatabase();
// Spinner Drop down elements
// List<String> lables = db.getAllLabels();
Cursor c = db.rawQuery(
"SELECT AccountID AS _id, ConsumerName FROM Consumers", null);
// Creating adapter for spinner
startManagingCursor(c);
String[] from = new String[] { "_id" };
int[] to = new int[] { android.R.id.text1 };
SimpleCursorAdapter dataAdapter = new SimpleCursorAdapter(this,
android.R.layout.simple_spinner_item, c, from, to);
// Drop down layout style - list view with radio button
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinner.setAdapter(dataAdapter);
// set spinner listener to display the selected item id
mContext = this;
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// On selecting a spinner item
//String label = parent.getItemAtPosition(position).toString();
Cursor c = (Cursor) parent.getItemAtPosition(position);
mSpinnerSpeciesId = c.getInt(c
.getColumnIndexOrThrow("ConsumerName"));
// Showing selected spinner item
/* Toast.makeText(parent.getContext(), "You selected: " + label,
Toast.LENGTH_LONG).show();*/
}
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
final Calendar ca = Calendar.getInstance();
int yy = ca.get(Calendar.YEAR);
int mm = ca.get(Calendar.MONTH);
int dd = ca.get(Calendar.DAY_OF_MONTH);
dateTv.setText(new StringBuilder()
// Month is 0 based, just add 1
.append(yy).append(" ").append("-").append(mm + 1).append("-")
.append(dd));
if (extras != null) {
rowID = extras.getLong("_id");
// meterNoEt.setText(extras.getString("MeterNumber"));
// set current date into textview
// Spinner click listener
currentEt.setText(extras.getString("Current"));
previousEt.setText(extras.getString("Previous"));
kWhEt.setText(extras.getString("kWh"));
// dateTv.setText(extras.getString("Date"));
}
Button calButton = (Button) findViewById(R.id.calculateDef);
calButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
float result = Float.parseFloat(currentEt.getText().toString())
- Float.parseFloat(previousEt.getText().toString());
kWhEt.setText(Float.toString(result));
}
});
Button saveButton = (Button) findViewById(R.id.addConsumption);
saveButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (kWhEt.getText().length() != 0) {
AsyncTask<Object, Object, Object> saveContactTask = new AsyncTask<Object, Object, Object>() {
@Override
protected Object doInBackground(Object... params) {
saveContact();
return null;
}
@Override
protected void onPostExecute(Object result) {
/*
* Intent addContact = new Intent(
* ElectricMeterReader.this,
* ConsumerReadList.class);
* startActivity(addContact);
*/
finish();
}
};
saveContactTask.execute((Object[]) null);
}
else {
AlertDialog.Builder alert = new AlertDialog.Builder(
ElectricMeterReader.this);
alert.setTitle(R.string.errorTitle);
alert.setMessage(R.string.errorMessage);
alert.setPositiveButton(R.string.errorButton, null);
alert.show();
}
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.consumer_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.addConsumerItem:
Intent addContact = new Intent(ElectricMeterReader.this,
AddEditConsumer.class);
startActivity(addContact);
return true;
case R.id.consumerInfo:
Intent electricMeterReader = new Intent(ElectricMeterReader.this,
ViewConsumer.class);
startActivity(electricMeterReader);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void saveContact() {
DatabaseConnector dbConnector = new DatabaseConnector(this);
if (getIntent().getExtras() == null) {
dbConnector.insertConsumption(meterNoEt.getText().toString(),
currentEt.getText().toString(), previousEt.getText()
.toString(), kWhEt.getText().toString(), dateTv
.getText().toString(),
spinner.getItemAtPosition(mSpinnerSpeciesId).toString()
);
} else {
dbConnector.updateConsumption(rowID,
currentEt.getText().toString(), previousEt.getText()
.toString(), kWhEt.getText().toString(), dateTv
.getText().toString(),
spinner.getItemAtPosition(mSpinnerSpeciesId).toString());
}
}
}
将编码的方法编码到我的数据库连接器中
public void insertConsumption(String meter_number, String current,
String previous, String kWh, String date, String consumer_name) {
ContentValues newCons = new ContentValues();
newCons.put("_id", meter_number);
newCons.put("Current", current);
newCons.put("Previous", previous);
newCons.put("kWh", kWh);
newCons.put("Date", date);
newCons.put("ConsumerName", consumer_name);
open();
database.insert("Consumptions", null, newCons);
close();
}
我的数据库Openhelper
public class DatabaseOpenHelper extends SQLiteOpenHelper {
static final String dbName = "ElectricMeterDB";
static final String tableLabels = "labels";
static final String consumptionsTable = "Consumptions";
static final String colMeterNumber = "_id";
static final String colCurrent = "Current";
static final String colPrevious = "Previous";
static final String colkWh = "kWh";
static final String colDate = "Date";
static final String colConsumer = "ConsumerName";
static final String consumersTable = "Consumers";
static final String colAccountID = "AccountID";
static final String colName = "ConsumerName";
static final String colAddress = "Address";
public static final String viewReads = "ViewReading";
public DatabaseOpenHelper(Context context) {
super(context, dbName, null, 2);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + consumersTable + " (" + colAccountID
+ " INTEGER PRIMARY KEY NOT NULL," + colName + " TEXT NOT NULL, "
+ colAddress + " TEXT NOT NULL);");
db.execSQL("CREATE TABLE " + consumptionsTable + " (" + colMeterNumber
+ " INTEGER PRIMARY KEY NOT NULL," + colCurrent + " INTEGER, "
+ colPrevious + " INTEGER, " + colkWh + " INTEGER, " + colDate
+ " TEXT, " + colConsumer + " INTEGER NOT NULL, FOREIGN KEY ("
+ colConsumer + ") REFERENCES " + consumersTable + " ("
+ colAccountID + "));");
db.execSQL("CREATE TRIGGER fk_cmpcons_consid" + " BEFORE INSERT "
+ " ON " + consumptionsTable + " FOR EACH ROW BEGIN"
+ " SELECT CASE WHEN ((SELECT " + colAccountID + " FROM "
+ consumersTable + " WHERE " + colAccountID + " =new."
+ colConsumer + ") IS NULL)"
+ "THEN RAISE (ABORT, 'Foreign Key Violation') END;" + "END;");
db.execSQL("CREATE VIEW " + viewReads + " AS SELECT "
+ consumptionsTable + " . " + colMeterNumber + " AS _id, "
+ consumptionsTable + " . " + colCurrent + " ,"
+ consumptionsTable + " . " + colPrevious + " ,"
+ consumptionsTable + " . " + colkWh + ", " + consumptionsTable
+ " . " + colDate + "," + consumersTable + "." + colConsumer
+ " FROM " + consumptionsTable + " JOIN " + consumersTable
+ " ON " + consumptionsTable + " . " + colConsumer + " = "
+ consumersTable + "." + colAccountID);
// Inserts pre-defined consumers
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS" + consumptionsTable);
db.execSQL("DROP TABLE IF EXISTS" + consumersTable);
db.execSQL("DROP TRIGGER IF EXISTS consumers_id_trigger");
db.execSQL("DROP TRIGGER IF EXISTS consumers_id_trigger22");
db.execSQL("DROP TRIGGER IF EXISTS fk_cmpcons_consid");
db.execSQL("DROP VIEW IF EXISTS" + viewReads);
onCreate(db);
}
public void insertLabel(String label) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(colName, label);
// Inserting Row
db.insert(tableLabels, null, values);
db.close(); // Closing database connection
}
/**
* Getting all labels returns list of labels
* */
public List<String> getAllLabels() {
List<String> labels = new ArrayList<String>();
// Select All Query
String selectQuery = "SELECT * FROM " + consumersTable;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
labels.add(cursor.getString(1));
} while (cursor.moveToNext());
}
// closing connection
cursor.close();
db.close();
// returning lables
return labels;
}
}
我遇到了这个问题。请帮我。感谢您对未来的回应。
log.d
02-18 13:49:59.870: D/saveContact(30881): _id: 36698521 ConsumerName: android.database.sqlite.SQLiteCursor@4144f700
我的arrayadapter;
public void arrayAdapterList() {
final String[] from = new String[] { DatabaseOpenHelper.colAccountID };
// int[] to = new int[] { android.R.id.text1 };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, from);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner = (Spinner) findViewById(R.id.spinner);
// attaching data adapter to spinner
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// On selecting a spinner item
// String col= c.getString(c.getColumnIndex("_id"));
int item = spinner.getSelectedItemPosition();
Toast.makeText(getBaseContext(), "You Selected: " + from[item],
Toast.LENGTH_SHORT).show();
}
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
}
答案 0 :(得分：8)
似乎您插入的某些值对于NOT NULL字段（在您的情况下为ConsumerName）或PK（在您的情况下为_id）已经存在时可能为NULL。错误代码19表示在操作期间违反了表约束（NOT NULL，UNIQUE等）（INSERT等）。以下是SQLITE Error Codes
的列表android.database.sqlite.SQLiteCursor@4144fa58是分配给ConsumerName的垃圾值。所以请做一些解决方法，从游标中获取适当的ConsumerName FK。
SimpleCursorAdapter有问题。所以请看一下。如果您在微调器中获得了正确的值，那么请从此类spinner.getSelectedItem().toString();而不是spinner.getItemAtPosition(mSpinnerSpeciesId).toString()获取来自spineer的选定值。
希望这会对你有所帮助。
答案 1 :(得分：1)
约束失败通常表示您执行的操作类似于将空值传递到您在创建表时声明为非null的列。
因此，删除非null并在创建表时放置null。
答案 2 :(得分：1)
我得到了同样的错误并通过在代码中设置ID NULL来解决它。 由于ID是PK SqlLite自动增加其值，因此不需要设置它。
public void insertConsumption(String meter_number, String current,
String previous, String kWh, String date, String consumer_name) {
ContentValues newCons = new ContentValues();
//newCons.put("_id", meter_number);
newCons.put("Current", current);
newCons.put("Previous", previous);
newCons.put("kWh", kWh);
newCons.put("Date", date);
newCons.put("ConsumerName", consumer_name);
open();
database.insert("Consumptions", null, newCons);
close();
}
答案 3 :(得分：0)
你宣布了专栏＆＃34; colAccountID＆＃34;作为PRIMARY KEY，因此当您尝试一次又一次地插入相同的id时，SQLite数据库会抛出错误。