问题
This code was working fine with one table....and was attaching file Now I want to create two tables first activity is inserting data in table1...but second activity is not inserting data....there is no log message........while calling attach it gives log as given below:
E/SQLiteLog: (1)
My database class is
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME="GEOTAG.db";
public static final String TABLE_NAME1="Coordinates_table";
public static final String TABLE_NAME2="Form1_table";
public static final String CoL_1="ID";
public static final String CoL_2="LATITUDE";
public static final String CoL_3="LONGITUDE";
public static final String CoL_4="IDForm1";
public static final String CoL_5="Residence";
public static final String CoL_6="Gender";
public static final int DATABASE_VERSION = 3;
public static Context c;
Intent intent =null,chooser=null;
File file =null;
String myFile="Data";
String fpath;
String fileName;
FileOutputStream fileOutputStream=null;
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
c=context;
}
@Override
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL("CREATE TABLE " + TABLE_NAME1 + " (" + CoL_1 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_2 +" TEXT,"+ CoL_3 +" TEXT)");
db.execSQL("CREATE TABLE " + TABLE_NAME2 + " (" + CoL_4 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + CoL_5 +" NTEXT,"+ CoL_6 +" NTEXT)");
} catch (SQLException e) {
Log.e("HEY","Error creating");
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
try{
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME1);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME2);
onCreate(db);}
catch (SQLException e){
e.printStackTrace();
}
}
public boolean insertData (String lat,String lng){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues =new ContentValues();
contentValues.put(CoL_2,lat);
contentValues.put(CoL_3,lng);
long res =db.insert(TABLE_NAME1,null,contentValues);
db.close();
return res != -1;
}
public boolean insertForm1 (String a,String b){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues =new ContentValues();
contentValues.put(CoL_5,a);
contentValues.put(CoL_6,b);
long res =db.insert(TABLE_NAME2,null,contentValues);
db.close();
return res != -1;
}
public void Attach()
{
int id ;
String latitude ;
String longitude ;
String residence ;
String gender ;
SQLiteDatabase db =this.getWritableDatabase();
String[] columns={CoL_1, CoL_2, CoL_3,CoL_5,CoL_6};
Cursor cursor1,cursor2;
cursor1 = db.query(TABLE_NAME1,columns,null,null,null,null,null);
cursor2 = db.query(TABLE_NAME2,columns,null,null,null,null,null);
fileName= myFile+"." +"txt";
// writing file on external storage
try {
File sdCard = Environment.getExternalStorageDirectory();
File dir = new File(sdCard.getAbsolutePath() + "/Files");
dir.mkdirs();
if (dir.isDirectory()) {
String[] children = dir.list();
for (int i = 0; i < children.length; i++) {
new File(dir, children[i]).delete();
}
}
file = new File(dir, fileName);
}
catch (Exception e){
e.printStackTrace();
}
try {
fileOutputStream = new FileOutputStream(file);
fpath = file.toString();
while (cursor1.moveToNext() ) {
int index1 = cursor1.getColumnIndex(CoL_1);
int index2 = cursor1.getColumnIndex(CoL_2);
int index3 = cursor1.getColumnIndex(CoL_3);
int index4 = cursor2.getColumnIndex(CoL_5);
int index5 = cursor2.getColumnIndex(CoL_6);
id = cursor1.getInt(index1);
latitude = cursor1.getString(index2);
longitude = cursor1.getString(index3);
residence = cursor2.getString(index4);
gender = cursor2.getString(index5);
String text1 = Integer.toString(id) + " ";
String text2 = latitude + " ";
String text3 = longitude + " ";
String text4 = residence + " ";
String text5 = gender + "\n";
fileOutputStream.write(text1.getBytes());
fileOutputStream.write(text2.getBytes());
fileOutputStream.write(text3.getBytes());
fileOutputStream.write(text4.getBytes());
fileOutputStream.write(text5.getBytes());
Toast.makeText(c,"Wait while the file is being attached", Toast.LENGTH_LONG).show();
}
Toast.makeText(c,"Ready to Send", Toast.LENGTH_LONG).show();
fileOutputStream.flush();
fileOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void SendData(){
if(fpath!= null) {
File targetFile = new File(fpath);
Uri docUri = Uri.fromFile(targetFile);
intent = new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_STREAM, docUri);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TEXT, "Attached Data.txt");
chooser = Intent.createChooser(intent, "Send Email....");
c.startActivity(chooser);
}
else
{
Toast.makeText(c,"Please attach file before Sending", Toast.LENGTH_LONG).show();
}
}
public void reset(){
SQLiteDatabase db =this.getWritableDatabase();
db.delete(TABLE_NAME1,null,null);
db.delete(TABLE_NAME2,null,null);
Toast.makeText(c,"Resetting Database", Toast.LENGTH_LONG).show();
}
}
I want to save data from 8 different activities in 8 different tables and read database in the end and send it through text file...Is there any other way of doing this?.
What I already tried , I created one table having 5 cloumns...1st activity was inserting data in first 3 columns and 2nd activity was inserting data in 4th and 5th columns........BUT it was creating two rows ,First row having last two columns with null values and Second row having first three columns with null values.....I want one row not two rows
回答1:
when you are inserting the data in same row , you should update the row instead of again calling insert. for eg:-
ContentValues cv = new ContentValues();
cv.put("Field1","value"); //These Fields should be your String values of
and then call update instead of insert
myDB.update(TableName, cv, "_id="+id, null);
you can refer this
回答2:
This works fine now
public boolean update(String Res, String Gen){ SQLiteDatabase db =
this.getWritableDatabase(); ContentValues contentValues =new
ContentValues(); contentValues.put(CoL_4,Res); contentValues.put(CoL_5,Gen);
db.update(TABLE_NAME,contentValues, "Residence = ?",new String[] { "A" });
return true; }
来源：https://stackoverflow.com/questions/43434318/sqlite-not-inserting-data-in-2nd-table