The question:
I’ve been trying to update a specific row for a while now, and it seems that there are two ways to do this. From what I’ve read and tried, you can just use the:
execSQL(String sql) method
or the:
update(String table, ContentValues values, String whereClause, String[] whereArgs) method.
(Let me know if this is incorrect as I am new to android and very new to SQL.)
So let me get to my actual code.
myDB.update(TableName, "(Field1, Field2, Field3)" + " VALUES ('Bob', 19, 'Male')", "where _id = 1", null);
I am trying to accomplish this:
Update Field1, Field2, and Field3 where the primary key (_id) is equal to 1.
Eclipse gives me a red line right underneath the word “update” and gives me this explanation:
The method update(String, ContentValues, String, String[]) in the type
SQLiteDatabase is not applicable for the arguments (String, String,
String, null)
I’m guessing I’m not assigning the ContentValues correctly. Can anyone point me in the right direction?
The Solutions:
Below are the methods you can try. The first solution is probably the best. Try others if the first one doesn’t work. Senior developers aren’t just copying/pasting – they read the methods carefully & apply them wisely to each case.
Method 1
First make a ContentValues object :
ContentValues cv = new ContentValues();
cv.put("Field1","Bob"); //These Fields should be your String values of actual column names
cv.put("Field2","19");
cv.put("Field2","Male");
Then use the update method, it should work now:
myDB.update(TableName, cv, "_id = ?", new String[]{id});
Method 2
Simple way:
String strSQL = "UPDATE myTable SET Column1 = someValue WHERE columnId = "+ someValue;
myDataBase.execSQL(strSQL);
Method 3
At first create a ContentValues object :
ContentValues cv = new ContentValues();
cv.put("Field1","Bob");
cv.put("Field2","19");
Then use the update method. Note, the third argument is the where clause. The “?” is a placeholder. It will be replaced with the fourth argument (id)
myDB.update(MY_TABLE_NAME, cv, "_id = ?", new String[]{id});
This is the cleanest solution to update a specific row.
Method 4
- I personally prefere .update for its convenience. But execsql will work same.
- You are right with your guess that the problem is your content values. You should create a ContentValue Object and put the values for your database row there.
This code should fix your example:
ContentValues data=new ContentValues();
data.put("Field1","bob");
data.put("Field2",19);
data.put("Field3","male");
DB.update(Tablename, data, "_id=" + id, null);
Method 5
you can try this…
db.execSQL("UPDATE DB_TABLE SET YOUR_COLUMN='newValue' WHERE id=6 ");
Method 6
hope this’ll help you:
public boolean updatedetails(long rowId, String address)
{
SQLiteDatabase mDb= this.getWritableDatabase();
ContentValues args = new ContentValues();
args.put(KEY_ROWID, rowId);
args.put(KEY_ADDRESS, address);
return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null)>0;
}
Method 7
You try this one update method in SQLite
int id;
ContentValues con = new ContentValues();
con.put(TITLE, title);
con.put(AREA, area);
con.put(DESCR, desc);
con.put(TAG, tag);
myDataBase.update(TABLE, con, KEY_ID + "=" + id,null);
Method 8
use this code in your DB
`
public boolean updatedetails(long rowId,String name, String address)
{
ContentValues args = new ContentValues();
args.put(KEY_ROWID, rowId);
args.put(KEY_NAME, name);
args.put(KEY_ADDRESS, address);
int i = mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null);
return i > 0;
}
for updating in your sample.java use this code
//DB.open();
try{
//capture the data from UI
String name = ((EditText)findViewById(R.id.name)).getText().toString().trim();
String address =(EditText)findViewById(R.id.address)).getText().toString().trim();
//open Db
pdb.open();
//Save into DBS
pdb.updatedetails(RowId, name, address);
Toast.makeText(this, "Modified Successfully", Toast.LENGTH_SHORT).show();
pdb.close();
startActivity(new Intent(this, sample.class));
finish();
}catch (Exception e) {
Log.e(TAG_AVV, "errorrrrr !!");
e.printStackTrace();
}
pdb.close();
Method 9
Can try like this:
ContentValues values=new ContentValues();
values.put("name","aaa");
values.put("publisher","ppp");
values.put("price","111");
int id=sqdb.update("table_name",values,"bookid='5' and booktype='comic'",null);
Method 10
if your sqlite row has a unique id or other equivatent, you can use where clause, like this
update .... where id = {here is your unique row id}
Method 11
For updates, need to call setTransactionSuccessfull for changes to get committed like so:
db.beginTransaction();
try {
db.update(...)
db.setTransactionSuccessfull(); // changes get rolled back if this not called
} finally {
db.endTransaction(); // commit or rollback
}
Method 12
//Here is some simple sample code for update
//First declare this
private DatabaseAppHelper dbhelper;
private SQLiteDatabase db;
//initialize the following
dbhelper=new DatabaseAppHelper(this);
db=dbhelper.getWritableDatabase();
//updation code
ContentValues values= new ContentValues();
values.put(DatabaseAppHelper.KEY_PEDNAME, ped_name);
values.put(DatabaseAppHelper.KEY_PEDPHONE, ped_phone);
values.put(DatabaseAppHelper.KEY_PEDLOCATION, ped_location);
values.put(DatabaseAppHelper.KEY_PEDEMAIL, ped_emailid);
db.update(DatabaseAppHelper.TABLE_NAME, values, DatabaseAppHelper.KEY_ID + "=" + ?, null);
//put ur id instead of the ‘question mark’ is a function in my shared preference.
Method 13
public void updateRecord(ContactModel contact) {
database = this.getReadableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FIRST_NAME, contact.getFirstName());
contentValues.put(COLUMN_LAST_NAME, contact.getLastName());
contentValues.put(COLUMN_NUMBER,contact.getNumber());
contentValues.put(COLUMN_BALANCE,contact.getBalance());
database.update(TABLE_NAME, contentValues, COLUMN_ID + " = ?", new String[]{contact.getID()});
database.close();
}
Method 14
just try this way
String strFilter = "_id=" + Id;
ContentValues args = new ContentValues();
args.put(KEY_TITLE, title);
myDB.update("titles", args, strFilter, null);**
Method 15
Method for updation in SQLite:
public void updateMethod(String name, String updatename){
String query="update students set email = ? where name = ?";
String[] selections={updatename, name};
Cursor cursor=db.rawQuery(query, selections);
}
Method 16
I will demonstrate with a complete example
Create your database this way
import android.content.Context
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteOpenHelper
class DBHelper(context: Context) : SQLiteOpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION) {
override fun onCreate(db: SQLiteDatabase) {
val createProductsTable = ("CREATE TABLE " + Business.TABLE + "("
+ Business.idKey + " INTEGER PRIMARY KEY AUTOINCREMENT ,"
+ Business.KEY_a + " TEXT, "
+ Business.KEY_b + " TEXT, "
+ Business.KEY_c + " TEXT, "
+ Business.KEY_d + " TEXT, "
+ Business.KEY_e + " TEXT )")
db.execSQL(createProductsTable)
}
override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
// Drop older table if existed, all data will be gone!!!
db.execSQL("DROP TABLE IF EXISTS " + Business.TABLE)
// Create tables again
onCreate(db)
}
companion object {
//version number to upgrade database version
//each time if you Add, Edit table, you need to change the
//version number.
private val DATABASE_VERSION = 1
// Database Name
private val DATABASE_NAME = "business.db"
}
}
Then create a class to facilitate CRUD -> Create|Read|Update|Delete
class Business {
var a: String? = null
var b: String? = null
var c: String? = null
var d: String? = null
var e: String? = null
companion object {
// Labels table name
const val TABLE = "Business"
// Labels Table Columns names
const val rowIdKey = "_id"
const val idKey = "id"
const val KEY_a = "a"
const val KEY_b = "b"
const val KEY_c = "c"
const val KEY_d = "d"
const val KEY_e = "e"
}
}
Now comes the magic
import android.content.ContentValues
import android.content.Context
class SQLiteDatabaseCrud(context: Context) {
private val dbHelper: DBHelper = DBHelper(context)
fun updateCart(id: Int, mBusiness: Business) {
val db = dbHelper.writableDatabase
val valueToChange = mBusiness.e
val values = ContentValues().apply {
put(Business.KEY_e, valueToChange)
}
db.update(Business.TABLE, values, "id=$id", null)
db.close() // Closing database connection
}
}
you must create your ProductsAdapter which must return a CursorAdapter
So in an activity just call the function like this
internal var cursor: Cursor? = null
internal lateinit var mProductsAdapter: ProductsAdapter
mSQLiteDatabaseCrud = SQLiteDatabaseCrud(this)
try {
val mBusiness = Business()
mProductsAdapter = ProductsAdapter(this, c = todoCursor, flags = 0)
lstProducts.adapter = mProductsAdapter
lstProducts.onItemClickListener = OnItemClickListener { parent, view, position, arg3 ->
val cur = mProductsAdapter.getItem(position) as Cursor
cur.moveToPosition(position)
val id = cur.getInt(cur.getColumnIndexOrThrow(Business.idKey))
mBusiness.e = "this will replace the 0 in a specific position"
mSQLiteDatabaseCrud?.updateCart(id ,mBusiness)
}
cursor = dataBaseMCRUD!!.productsList
mProductsAdapter.swapCursor(cursor)
} catch (e: Exception) {
Log.d("ExceptionAdapter :",""+e)
}
Method 17
SQLiteDatabase myDB = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(key1,value1);
cv.put(key2,value2); /*All values are your updated values, here you are
putting these values in a ContentValues object */
..................
..................
int val=myDB.update(TableName, cv, key_name +"=?", new String[]{value});
if(val>0)
//Successfully Updated
else
//Updation failed
Method 18
Here I have completed this kind of code for update the row of a database, this is the code of Database handler class
public Boolean updateData(String id,String name,String age,String gender){
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(ID,id);
contentValues.put(NAME,name);
contentValues.put(AGE,age);
contentValues.put(GENDER,gender);
sqLiteDatabase.update(TABLE_NAME,contentValues,ID+"= ?",new String[]{id});
return true; //Boolean value return korbe
}
Method 19
public long fillDataTempo(String table){
String[] table = new String[1];
tabela[0] = table;
ContentValues args = new ContentValues();
args.put(DBOpenHelper.DATA_HORA, new Date().toString());
args.put(DBOpenHelper.NOME_TABELA, nome_tabela);
return db.update(DATABASE_TABLE, args, STRING + " LIKE ?" ,tabela);
}
Method 20
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);
}
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0