Updating rows in Android SQlite - android

I'm using SQlite in my Android app and the task is - how can I update all the rows in one table?
I have a 1st column with name "cl_id" (integer numbers 1-2-3-4..) and after deleting some rows, I wan't to make a cycle to fill this 1st column with a new values to keep them in right order.
I was trying to execute:
data.put("cl_id",index);
db.update("mdb_table_contactList", data, null, null);
but it's updates all the values in the first column :(

To update the field in specific row, try this;
ContentValues data = new ContentValues();
data.put("cl_id",index);
db.update("mdb_table_contactList", data, "id="+_id, null);
db.close();
It's good practice to have a primary key for each row data.
Here _id would be your primary key.

"just give rowId and type of data that is going to be update in ContentValues."
public void updateStatus(String id , int status){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues data = new ContentValues();
data.put("status", status);
db.update(TableName, data, "columnName" + " = "+id , null);
}

Try this it must work
void updateDatail(String id) {
ContentValues data = new ContentValues();
data.put("cl_id",index);
db.update("mdb_table_contactList", data, "id=?", new String[]{id});
db.close();
}

Related

Is there a way to change android sqlite data?

I want to swap sqlite data
now, I am changing data after saving it in a variable
Is there a better way? Thank you
updateDbDate(fromItem.getTitle(),fromItem.getCable(),fromItem.getImg(),toItem.getId());
updateDbDate(toItem.getTitle(),toItem.getCable(), toItem.getImg(),fromItem.getId());
public void updateDbDate(String mTitle, String mCable, String mImg, int id)
{
ContentValues values = new ContentValues();
values.put("title", mTitle);
values.put("cable", mCable);
values.put("bimg", mImg);
db.update(Define.DB, values,"_id = " + "'" + id + "'",null);
}
What I understand is that you want to swap the values of 3 columns between 2 rows for which you know the ids.
If you also know the values of the other 3 columns then your method is correct.
If you don't know them and you have to read them from the table then I think it would be better to just swap the ids:
public void swapIds(int id1, int id2) {
ContentValues values = new ContentValues();
values.put("_id", -1);
db.update(Define.DB, values, "_id = ?", new String[] {String.valueOf(id1)});
values.put("_id", id1);
db.update(Define.DB, values, "_id = ?", new String[] {String.valueOf(id2)});
values.put("_id", id2);
db.update(Define.DB, values, "_id = ?", new String[] {"-1"});
db.close();
}
The 1st update sets temporarily -1 to the first _id, because I guess it is the PRIMARY KEY and it can't be set to id2 because it already exists.
The 2nd update sets id1 to the second _id (it can be done since id1 does not exist in the table from the previous update).
And the 3d update sets id2 to the first _id.
Now you can call the method:
swapIds(100, 200);
Note: this method is not recommended if there are references in other tables to the _id of this table.

insertWithOnConflict making Columns null

I have the following code to update or insert database, where q_id is my primary key
public long updateResponse(int response, int q_id) {
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues contentValues = new ContentValues();
long id = 0;
contentValues.put(VivzHelper.Q_ID, q_id);
contentValues.put(VivzHelper.QUESTION_RESPONSE, response);
id = db.insertWithOnConflict(VivzHelper.TABLE_QUESTION_TEXT, null, contentValues, SQLiteDatabase.CONFLICT_REPLACE);
if(id==-1)
Log.d("failed", "failed"+response);
else
Log.d("success","success"+response);
return id;
}
Above code is updating/inserting QUESTION_RESPONSE but making all other column in that row as null in table.. Help
Above code is updating/inserting QUESTION_RESPONSE but making all other column in that row as null in table
That's what the "replace" conflict resolution does. If the insert would result in a conflict, the conflicting rows are first deleted and only then is the new row inserted. NULL is the default default value for a column.
If you need to retain other column data in the row, use an UPDATE query. For example, to update the response column to the row with the specified id:
contentValues.put(VivzHelper.QUESTION_RESPONSE, response);
db.update(VivzHelper.TABLE_QUESTION_TEXT, contentValues,
VivzHelper.Q_ID + "=?", new String[] { String.valueOf(q_id) });

Update value to specific primary key in sqlite , android?

I have to below table structure of my sqlite database in android
I want to update value to "answer" column according to the ques id.
How do I do it?
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_Answer, answer);
// Inserting Row
db.insert(TABLE_Question, null, values);
db.close(); // Closing database connection
I want to insert value to "answer" column according to the ques id.
This operation called "update" instead of "insert".
insert: means to add new record in table,
update: means change value of any exist row columns
so required operation is update.use update method as:
String where = "Ques_id=?";
String[] whereArgs = new String[] {String.valueOf(Ques_id)};
ContentValues values = new ContentValues();
values.put(KEY_Answer, answer);
db.update(TABLE_Question, values, where, whereArgs);
insert() inserts a new row. To update a column on an existing row, use update() with a selection like "Ques_id=" + id.

How to keep the database updated when the user enters new values in android studio?

I'm dealing with a simple app, which basically stores various dates. But when I enter a new date, I have to close the app and open it again. The same thing counts for changing the date values. I can only see the changes by closing the app and reopening it.
Here are the two main functions in my DB class;
public void addBirthday(Person person){ //Add a data to database
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(column_name, person.getName());
cv.put(column_sname, person.getSname());
cv.put(column_day, person.getDay());
cv.put(column_month, person.getMonth());
cv.put(column_year, person.getYear());
db.insert(TABLE_NAME, null, cv);
db.close();
}
public int updateBirthday(Person person) {
// 1. get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
// 2. create ContentValues to add key "column"/value
ContentValues cv = new ContentValues();
cv.put(column_name, person.getName());
cv.put(column_sname, person.getSname());
cv.put(column_day, person.getDay());
cv.put(column_month, person.getMonth());
cv.put(column_year, person.getYear());
// 3. updating row
int i = db.update(TABLE_NAME, //table
cv, // column/value
column_id +" = ?", // selections
new String[] { String.valueOf(person.getId()) }); //selection args
// 4. close
db.close();
return i;
}
You will need to refresh the view (probably a ListView) where you display this data.
Get rid of the notifyDataSetChanged() and call requery() on your Cursor

How to prevent to insert duplicate value in sqlite database (if duplicate then overwrite)

I had created two table in my database, In both table I am inserting value at the same time, now what I want to do is that, I want to insert record in second table, but the condition is that, if there is two same record then I want insert only one record not duplicate value, In second table there is two field one is id and second is category, when user insert two same category that time I want to insert only one entry, below is my code which is not working properly, It insert all record accept duplicate value..
public long InsertCat(String idd, String cat)
{
try
{
SQLiteDatabase db;
long rows = 0;
db = this.getWritableDatabase();
ContentValues Val = new ContentValues();
Val.put("IDD", idd);
Val.put("Category", cat);
Cursor c = db.rawQuery("SELECT * FROM " + TABLE_CATEGER + " WHERE Category='"+cat+"'",null);
while(c.moveToNext())
{
if(c.getString(0).equals(cat))
{
flag=true;
}
}
if(flag==true)
{
rows=db.update(TABLE_CATEGER, Val, "Category='"+cat+"'" , null);
System.out.print(rows);
db.close();
}
if(flag==false)
{
rows = db.insert(TABLE_CATEGER, null, Val);
System.out.print(rows);
db.close();
}
return rows; // return rows inserted.
} catch (Exception e) {
return -1;
}
}
Put all your values inside ContentValues and then call this on writableDatabase
db.insertWithOnConflict(tableName, null, contentValues,SQLiteDatabase.CONFLICT_REPLACE);
EDIT:
Well all you need is only this part of code
SQLiteDatabase db;
long rows = 0;
db = this.getWritableDatabase();
ContentValues Val = new ContentValues();
Val.put("IDD", idd);
Val.put("Category", cat);
rows = db.insertWithOnConflict(tableName, null, contentValues,SQLiteDatabase.CONFLICT_REPLACE);
insertWithOnConflict methods follows the last parameter as the reaction algorithm when an duplicate row is Found. And for a duplicate row to be found, the primary keys has to clash. If all this satisfys the row would surely get Replaced :-/ If not something else is going wrong..
While creating your table, put constraint on your column(Primary key or Unique key).This will not only the duplicate value to be inserted into your database.
This is working for me,and i also created Category as a primary key..
ContentValues Val = new ContentValues();
Val.put("IDD", idd);
Val.put("Category", cat);
long rows=db.insertWithOnConflict(TABLE_CATEGER, null, Val,SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("kkkkkkkkkk",""+ rows);
db.close();
return rows; // return rows inserted.
Check with the primary key of which you want assign then while inserting check with on duplicate key..
if you want you update the row
on duplicate key update
As mentioned i am writing the code on duplicate key
INSERT OR REPLACE INTO TABLE_CATEGER(value1,value2,value3)
Use the following query
INSERT OR REPLACE INTO table_name (idColoumn, categoryColumn) VALUES (?, ?)
It will add new row if it does not exist or update row if it exists.
hope this will help you.
use insertWithOnConflict() method instead of insert()
response = sqLiteDatabase.insertWithOnConflict(TABLE_TRACKER_LOGS_LINES, null, contentValues,SQLiteDatabase.CONFLICT_REPLACE);

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