我正在尝试将一些值插入到我的visits表中。访问表有一个schedule_id列，它保存一个整数值。
Schedule_id不是主键。
我的问题是当我尝试在Schedule_id列中插入相同的id时，我收到并且错误。
但如果我尝试使用唯一值，那就有效。
这是我的代码。
Dbhelper课程
public class DBHelper extends SQLiteOpenHelper {
public static final String TAG = "DBHelper";
// columns of the schedule table
public static final String TABLE_SCHEDULE= "schedule";
public static final String COLUMN_SCHEDULE_ID = "schedule_id";
public static final String COLUMN_SCHEDULE_NAME = "schedule_name";
public static final String COLUMN_SCHEDULE_DATE = "schedule_date";
// columns of the items table
public static final String TABLE_ITEM= "items";
public static final String COLUMN_ITEM_ID = "item_id";
public static final String COLUMN_ITEM_VISIT_ID = "visit_id";
public static final String COLUMN_ITEM_NAME = "item_name";
public static final String COLUMN_ITEM_CHECK_STATUS= "item_check_status";
public static final String COLUMN_ITEM_COMMENT = "item_comment";
// columns of the employees table
public static final String TABLE_VISITS = "visits";
public static final String COLUMN_VISITS_ID = "visit_id";
public static final String COLUMN_VISITS_SCHEDULE_ID = "schedule_id";
public static final String COLUMN_VISITS_NAME = "visit_name";
public static final String COLUMN_VISITS_TIME = "visit_time";
public static final String COLUMN_VISITS_PLACE = "visit_place";
public static final String COLUMN_VISITS_ADDRESS ="visit_address";
public static final String COLUMN_VISITS_LOCATION_LAT = "visit_location_lat";
public static final String COLUMN_VISITS_LOCATION_LNG = "visit_location_lng";
public static final String COLUMN_VISITS_STATUS = "visit_status";
private static final String DATABASE_NAME = "certisagent";
private static final int DATABASE_VERSION = 2;
// SQL statement of the visits table creation
private static final String SQL_CREATE_TABLE_VISITS = "CREATE TABLE " + TABLE_VISITS + "("
+ COLUMN_VISITS_ID + " INTEGER PRIMARY KEY, "
+ COLUMN_VISITS_SCHEDULE_ID + " INTEGER, "
+ COLUMN_VISITS_NAME + " TEXT NOT NULL, "
+ COLUMN_VISITS_TIME + " TEXT NOT NULL, "
+ COLUMN_VISITS_PLACE + " TEXT NOT NULL, "
+ COLUMN_VISITS_ADDRESS + " TEXT NOT NULL, "
+ COLUMN_VISITS_LOCATION_LAT + " TEXT NOT NULL, "
+ COLUMN_VISITS_LOCATION_LNG + " TEXT NOT NULL, "
+ COLUMN_VISITS_STATUS + " INTEGER "
+");";
// SQL statement of the schedule table creation
private static final String SQL_CREATE_TABLE_SCHEDULE = "CREATE TABLE " + TABLE_SCHEDULE + "("
+ COLUMN_SCHEDULE_ID + " INTEGER PRIMARY KEY, "
+ COLUMN_SCHEDULE_NAME + " TEXT NOT NULL, "
+ COLUMN_SCHEDULE_DATE + " TEXT NOT NULL "
+");";
// SQL statement of the item table creation
private static final String SQL_CREATE_TABLE_ITEMS = "CREATE TABLE " + TABLE_ITEM + "("
+ COLUMN_ITEM_ID + " INTEGER PRIMARY KEY, "
+ COLUMN_ITEM_VISIT_ID + " INTEGER, "
+ COLUMN_ITEM_NAME + " TEXT NOT NULL, "
+ COLUMN_ITEM_CHECK_STATUS + " INTEGER, "
+ COLUMN_ITEM_COMMENT + " TEXT NOT NULL "
+");";
public DBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(SQL_CREATE_TABLE_SCHEDULE);
database.execSQL(SQL_CREATE_TABLE_VISITS);
database.execSQL(SQL_CREATE_TABLE_ITEMS);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG,
"Upgrading the database from version " + oldVersion + " to " + newVersion);
// clear all data
db.execSQL("DROP TABLE IF EXISTS " + TABLE_SCHEDULE);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_VISITS);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_ITEM);
// recreate the tables
onCreate(db);
}
}
VisitsDOA Class
public class VisitsDAO {
public static final String TAG = "visitsDAO";
// Database fields
private SQLiteDatabase mDatabase;
private DBHelper mDbHelper;
private Context mContext;
private String[] mAllColumns = {
DBHelper.COLUMN_VISITS_ID,
DBHelper.COLUMN_VISITS_SCHEDULE_ID,
DBHelper.COLUMN_VISITS_NAME,
DBHelper.COLUMN_VISITS_TIME,
DBHelper.COLUMN_VISITS_PLACE,
DBHelper.COLUMN_VISITS_ADDRESS,
DBHelper.COLUMN_VISITS_LOCATION_LAT,
DBHelper.COLUMN_VISITS_LOCATION_LNG,
DBHelper.COLUMN_VISITS_STATUS };
public VisitsDAO(Context context) {
this.mContext = context;
mDbHelper = new DBHelper(context);
// open the database
try {
open();
} catch (SQLException e) {
Log.e(TAG, "SQLException on openning database " + e.getMessage());
e.printStackTrace();
}
}
public void open() throws SQLException {
mDatabase = mDbHelper.getWritableDatabase();
}
public void close() {
mDbHelper.close();
}
public Visits createvisits(int vid, int v_sid, String vname, String vtime, String vplace, String address, String vlat, String vlong, int vstatus) {
ContentValues values = new ContentValues();
values.put(DBHelper.COLUMN_VISITS_ID, vid);
values.put(DBHelper.COLUMN_VISITS_SCHEDULE_ID, v_sid);
values.put(DBHelper.COLUMN_VISITS_NAME, vname);
values.put(DBHelper.COLUMN_VISITS_TIME, vtime);
values.put(DBHelper.COLUMN_VISITS_PLACE, vplace);
values.put(DBHelper.COLUMN_VISITS_ADDRESS, address);
values.put(DBHelper.COLUMN_VISITS_LOCATION_LAT, vlat);
values.put(DBHelper.COLUMN_VISITS_LOCATION_LNG, vlong);
values.put(DBHelper.COLUMN_VISITS_STATUS, vstatus);
long insertId = mDatabase
.insert(DBHelper.TABLE_VISITS, null, values);
Cursor cursor = mDatabase.query(DBHelper.TABLE_VISITS, mAllColumns,
DBHelper.COLUMN_SCHEDULE_ID + " = " + insertId, null, null,
null, null);
cursor.moveToFirst();
Visits newvisits = cursorTovisits(cursor);
cursor.close();
return newvisits;
}
public List<Visits> getAllvisits() {
List<Visits> listVisits = new ArrayList<Visits>();
Cursor cursor = mDatabase.query(DBHelper.TABLE_VISITS, mAllColumns,
null, null, null, null, null);
if (cursor != null) {
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Visits visits = cursorTovisits(cursor);
listVisits.add(visits);
cursor.moveToNext();
}
// make sure to close the cursor
cursor.close();
}
return listVisits;
}
public List<Visits> getAllvisitsforSchedule(int id) {
List<Visits> listVisits = new ArrayList<Visits>();
Cursor cursor = mDatabase.query(DBHelper.TABLE_VISITS, mAllColumns,
DBHelper.COLUMN_VISITS_SCHEDULE_ID + " = ?",
new String[]{String.valueOf(id)}, null, null, null);
if (cursor != null) {
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Visits visits = cursorTovisits(cursor);
listVisits.add(visits);
cursor.moveToNext();
}
// make sure to close the cursor
cursor.close();
}
return listVisits;
}
public Visits getvisitById(int id) {
Cursor cursor = mDatabase.query(DBHelper.TABLE_VISITS, mAllColumns,
DBHelper.COLUMN_VISITS_ID + " = ?",
new String[]{String.valueOf(id)}, null, null, null);
if (cursor != null) {
cursor.moveToFirst();
}
Visits visits = cursorTovisits(cursor);
return visits;
}
protected Visits cursorTovisits(Cursor cursor) {
Visits schedule = new Visits();
schedule.setvId(cursor.getInt(0));
schedule.setVschID(cursor.getInt(1));
schedule.setVname(cursor.getString(2));
schedule.setVtime(cursor.getString(3));
schedule.setVplace(cursor.getString(4));
schedule.setVaddress(cursor.getString(5));
schedule.setVlat(cursor.getString(6));
schedule.setVlong(cursor.getString(7));
schedule.setVstatus(cursor.getInt(8));
return schedule;
}
}
主要活动类
public class MainActivity extends ListActivity {
private static final String TAG = "Main Activity";
private ScheduleDAO mscheduleDAo;
private VisitsDAO mvisitsDAO;
List<Schedule> ListSchedule;
// schedule variables
public int schedule_id = 29;
public String schedule_name = "Schedule 13";
public String schedule_date = "2015-07-06";
// visits variables
public int visit_id = 42;
public int visit_schedule_id =41;
public String visit_name = "visit15";
public String visit_time = "21:23";
public String visit_place= "kilinochchi";
public String visit_address = "vavuniya Street";
public String visit_lat = "0.1115252";
public String visit_long = "0.254255";
public int visit_status = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// insert_schedule();
insert_visits();
list_all_schedules();
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Schedule schdul = ListSchedule.get(position);
int sch_id = schdul.getId();
String sch_stng_id =Integer.toString(sch_id);;
String sch_name = schdul.getName();
Intent intent = new Intent(this, VisitsActivity.class);
intent.putExtra("sch_id", schdul.getId());
intent.putExtra("sch_name", schdul.getName());
Toast.makeText(this, sch_stng_id+" : "+sch_name, Toast.LENGTH_LONG).show();
startActivity(intent);
// super.onListItemClick(l, v, position, id);
}
private void list_all_schedules(){
mscheduleDAo =new ScheduleDAO(getApplicationContext());
ListSchedule = mscheduleDAo.getAllschedules();
ArrayAdapter <Schedule> adapter = new ArrayAdapter<Schedule>(this, R.layout.list_schedules_layout, ListSchedule);
setListAdapter(adapter);
}
private boolean insert_schedule(){
mscheduleDAo =new ScheduleDAO(getApplicationContext());
Schedule createdschedule = mscheduleDAo.createschedule(Integer.parseInt(String.valueOf(schedule_id)),
schedule_name,
schedule_date);
Toast.makeText(this, "Schedule insert sucessfull", Toast.LENGTH_LONG).show();
return true;
}
private boolean insert_visits(){
mvisitsDAO = new VisitsDAO(getApplicationContext());
Visits createvisits =mvisitsDAO.createvisits(Integer.parseInt(String.valueOf(visit_id)),
Integer.parseInt(String.valueOf(visit_schedule_id)),
visit_name, visit_time, visit_place, visit_address, visit_lat, visit_long,
visit_status);
Toast.makeText(this, "Visit insert sucessfull", Toast.LENGTH_LONG).show();
return true;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
错误
07-07 09:11:28.957 11339-11339/lk.db.learn.databsetesting E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: lk.db.learn.databsetesting, PID: 11339
java.lang.RuntimeException: Unable to start activity ComponentInfo{lk.db.learn.databsetesting/lk.db.learn.databsetesting.MainActivity}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2429)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493)
at android.app.ActivityThread.access$800(ActivityThread.java:166)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5584)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
at android.database.AbstractCursor.checkPosition(AbstractCursor.java:426)
at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
at android.database.AbstractWindowedCursor.getInt(AbstractWindowedCursor.java:68)
at lk.db.learn.databsetesting.data.VisitsDAO.cursorTovisits(VisitsDAO.java:156)
at lk.db.learn.databsetesting.data.VisitsDAO.createvisits(VisitsDAO.java:76)
at lk.db.learn.databsetesting.MainActivity.insert_visits(MainActivity.java:105)
at lk.db.learn.databsetesting.MainActivity.onCreate(MainActivity.java:59)
at android.app.Activity.performCreate(Activity.java:5442)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2393)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493)
at android.app.ActivityThread.access$800(ActivityThread.java:166)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5584)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：1)
insert()返回插入行的SQLite rowid。根据您的create table语句，此值应与COLUMN_VISITS_ID匹配，而不是COLUMN_VISITS_SCHEDULE_ID。您现在拥有的代码是在错误的列中查找此值。查询找不到匹配的行并返回空光标，因此当您尝试从光标读取时，最终会得到CursorIndexOutOfBoundsException。
在VisitsDAO中更改您的查询，如下所示：
long insertId = mDatabase.insert(DBHelper.TABLE_VISITS, null, values);
Cursor cursor = mDatabase.query(DBHelper.TABLE_VISITS, mAllColumns,
DBHelper.COLUMN_VISITS_ID + " = " + insertId, null, null, null, null);
答案 1 :(得分：1)
在 cursorTovisits（光标光标）中，请检查光标对象是否有数据。从堆栈跟踪开始，似乎光标没有正确的数据或者没有指向正确的位置。它会抛出这个 CursorIndexOutOfBoundsException 。从docs开始，当光标超出范围时抛出此异常。
要解决此错误，请使用以下内容：
if( cursor != null && cursor.moveToFirst() ){
num = cursor.getString(cursor.getColumnIndex("column name"));
}