I am trying to insert data in an SQLite database from different places in different columns at a time. When I view the database, each insert takes one row. My databases lookes like this:
How do I achieve this? Any suggestions?
In order to insert a new row within your database, you need to add the following code into the Java class that manages your SQLite database:
public long insertRow(String name, String email)
{
ContentValues contentValues = new ContentValues();
contentValues.put(rowName, name);
contentValues.put(rowEmail, email);
return database.insert(databaseTable, null, contentValues);
}
The variable database refers to the database you attempting to insert the row. The variable databaseTable refers to the table you want to insert the row into. If you are attempting to update an existing column, you need to add the following code into the Java class that manages your database:
public boolean updateRow(long id, String name, String email)
{
ContentValues contentValues = new ContentValues();
contentValues.put(rowName, name);
contentValues.put(rowEmail, email);
return database.update(databaseTable, contentValues, rowId + “=” + id, null) > 0;
}
In order to call this function, you need to pass the id of the row and the desired values to pass in order to update them.
Related
I am having a table named keywords in database.I want to retrieve data of alarm and location columns from this table and unable to retrieve them except for contact number.For now I am showing their values in a Toast but every time I run any query to show my alarm or location in Toast its empty.But my contact_number is always shown.Don't understand the cause of this problem .I have also checked my tables view and it is showing the values of alarm ,location in them.
Create Table keywords( contact_number text primary key , alarm text , location text )
and my insert function is
public boolean insertkeys (String alarm ,String location ,String contact){
SQLiteDatabase db = this.getWritableDatabase();
//ContentValues is a name value pair, used to insert or update values into database tables.
// ContentValues object will be passed to SQLiteDataBase objects insert() and update() functions.
// ContentValues contentValues = new ContentValues();
ContentValues contentValues = new ContentValues();
contentValues.put("alarm",alarm);
contentValues.put("location",location);
contentValues.put("contact_number",contact);
long ins = db.insert("keywords",null,contentValues);
long upd = db.update("keywords",contentValues,"contact_number = ?",new String[]{contact});
// db.close();
if(ins == -1 && upd == -1)
return false;
else
return true;
}
I am inserting plus updating my data every single time my save button is clicked.Can anyone here tell how can I write a query to retrieve data of these fields and set it to Toast or Edit text. I am new to Database and stuck here for about a week. Thanks in advance for help :)
You extract data via a SELECT query which is returned as a Cursor when using the Android SDK.
The Cursor is similar to a table in that it has a number of rows, each with a set number of columns as determined by what you select.
To get all rows the SELECT query would be along the lines of :-
`SELECT * FROM keywords`
To do this using the Android SDK you could use the SQLiteDatabase query convenience method e.g. for the above you could use :-
Cursor cursor = db.query("keywords",null,null,null,null,null,null);
check the links above for the values/parameters that can be passed and how they correlate with the SELECT statement.
You then traverse the returned cursor extracting the data, typically using the Cursor's move??? methods. Noting that most will return false if the move could not be made and also noting that the original position in the Cursor is before the first row
As such you could have a method that returns a Cursor as per :-
public Cursor getAllKeys(){
SQLiteDatabase db = this.getWritableDatabase();
return db.query("keywords",null,null,null,null,null,null);
}
You could then process all the rows using :-
Cursor csr = yourDBHelper.getAllKeys();
while (csr.moveToNext()) {
String current_contact_number = csr.getString(csr.getColumnIndex("contact_number");
String current_alarm = csr.getString(csr.getColumnIndex("alarm");
String current_location = csr.getString(csr.getColumnIndex("location"));
...... your code to Toast or use the retrieved values
}
csr.close(); //<<<<<<<<<< you should always close a Cursor when finished with it.
Additional
In regard to the comment :-
Cursor query which you have suggested I tried to make changes in it
like putting column and where clause but after that it returns me
nothing when I execute it.Could you tell me that query too.
The following could be a method to retrieve just the alarm according to a contact number.
public String getAlarmByContactNumber(String contactNumber){
String rv = "";
SQLiteDatabase db = this.getWritableDatabase();
Cursor csr = db.query(
"keywords", //<<<<<<<<<<<< the FROM clause (less the FROM keyword) typically the name of the table from which the data is to be extracted (but can include JOINS for example, for more complex queries)
new String[]{"alarm"}, //<<<<<<<<<< A String[] of the column names to be extracted (null equates to * which means all columns) (note can be more complex and include functions/sub queries)
"contact_number=?", //<<<<<<<<<< WHERE clause (less the WHERE keyword) note **?** are place holders for parameters passed as 4th argument
new String[]{contactNumber},
null, //<<<<<<<<<< GROUP BY clause (less the GROUP BY keywords)
null, //<<<<<<<<<< HAVING clause (less the HAVING keyword)
null //<<<<<<<<<< ORDER BY clause (less the ORDER BY keywords)
);
if (csr.moveToFirst()) {
rv = csr.getString(csr.getColumnIndex("alarm"));
}
csr.close();
return rv;
}
The above assumes that you would only have/want one alarm per contact number.
The above is in-principle code, it has not been run or tested and may therefore contain some minor errors.
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();
}
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) });
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);
i'm unable to delete row in a table using sqlite 3.In my code i would like to compare two
values an then delete the data in a table but it is not possible please help me.
while(authCur.moveToNext())
{
db.delete("auth_tab",authCur.getString(0)+"=?" , new String[] { user });
db.delete("auth_tab", null, null);
}
Deleting data
Once data is no longer needed it can be removed from the database with the delete() method. The delete() method expects 3 parameters, the database name, a WHERE clause, and an argument array for the WHERE clause. To delete all records from a table pass null for the WHERE clause and WHERE clause argument array.
db.delete("auth_tab", "authCur.getString(0)=?", new String[] {user);
Simply call the delete() method to remove records from the SQLite database. The delete method expects, the table name, and optionally a where clause and where clause argument replacement arrays as parameters. The where clause and argument replacement array work just as with update where ? is replaced by the values in the array.
or
public void deleteContact(long id) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(auth_tab, KEY_USER + " = ?",
new String[] { user) });
db.close();
}
WATCH more, and you tube video, how to delete.