Develop Reference

Getting All data from specific column in SQLITE Android

There is android sqlite database with one table, im using this query for getting values :
Cursor cursor = db.query(Table_Items, null, "type=? AND operationtype=? AND problemtype=?",
new String[] { roosazi,type,problem }, null, null,KEY_Items_ID+" "+date , null);
everything is working fine.
question is:
how can i get all from specific column? let me give an example:
all values with type="A" and operationtype="XYZ" are needed , no matter what problemtype is! of course i can use something like this :
Cursor cursor = db.query(Table_Items, null, "type=? AND operationtype=?",
new String[] { roosazi,type }, null, null,KEY_Items_ID+" "+date , null);
but problem is sometimes problemtype is X and sometimes its like ALL!
how can i achieve this? can i put something like * instead of problem?
thank u so much

I understand that you want to use the same query to get sometimes with a particular problem type like X,Y or Z, and sometimes with any problem type,
If that is the case you could use the statement 'like' in your query instead of '=' in the problemtype field
Cursor cursor = db.query(Table_Items, null, "type=? AND operationtype=? AND problemtype like '?'",
When you want to return all values just past
problem = "%"
% simbol means any characters,
When you want to return values with a particular problem use
problem = "X"
in the values array
new String[] { roosazi,type,problem }

Understanding SQLite Cursor Behavior

I'm writing a method to update default settings in a table. The table is very simple: two columns, the first containing labels to indicate the type of setting, the second to store the value of the setting.
At this point in the execution, the table is empty. I'm just setting up the initial value. So, I expect that this cursor will come back empty. But instead, I'm getting an error (shown below). The setting that I am working with is called "lastPlayer" and is supposed to get stored in the "SETTING_COLUMN" in the "SETTINGS_TABLE". Here's the code:
public static void updateSetting(String setting, String newVal) {
String table = "SETTINGS_TABLE";
String[] resultColumn = new String[] {VALUE_COLUMN};
String where = SETTING_COLUMN + "=" + setting;
System.err.println(where);
SQLiteDatabase db = godSimDBOpenHelper.getWritableDatabase();
Cursor cursor = db.query(table, resultColumn, where, null, null, null, null);
System.err.println("cursor returned"); //I never see this ouput
\\more
}
sqlite returned: error code = 1, msg = no such column: lastPlayer
Why is it saying that there is no such column lastPlayer? I thought that I was telling the query to look at the column "SETTING_COLUMN" and return the record where that column has a value "lastPlayer". I'm confused. Can somebody straighten me out? I've been looking a this for an hour and I just don't see what I am doing wrong.
Thanks!

You're not properly building/escaping your query. Since the value lastPlayer is not in quotes, your statement is checking for equality of two columns, which is what that error message is saying.
To properly build your query, it's best to not do this manually with String concatenation. Instead, the parameter selectionArgs of SQLiteDatabase.query() is meant to do this.
The parameters in your query should be defined as ? and then filled in based on the selectionArgs. From the docs:
You may include ?s in selection, which will be replaced by the values
from selectionArgs, in order that they appear in the selection. The
values will be bound as Strings.
So, your code would look like this:
String where = SETTING_COLUMN + " = ?";
Cursor cursor = db.query(table, resultColumn, where, new String[] { setting }, null, null, null);

SQLite .query() method, WHERE clause is only taking double quotes strings

I have variable:
String owner="Mike";
String[] columns ={"quantity", "price","owner"}
My cursor is trying to get
Cursor findEntry = db.query("sku_table", columns, "owner="+owner, null, null, null, null);
I got an error no such column error
android.database.sqlite.SQLiteException: no such column: owner: , while compiling: SELECT quantity, price, owner, FROM sku_table WHERE owner=Mike
But if I take this query:
SELECT quantity, price, owner, FROM sku_table WHERE owner=Mike
and add "" to Mike, and tested in sqlite browsers to execute the query, I do get back the row.
The working query looks like this:
SELECT quantity, price, owner, FROM sku_table WHERE owner="Mike"
Can somebody drop some insights about how do I incorporate double quotes? Other than use \"
Thanks!

Sorry, but that is exactly the reason why you should work with what the method offers! #Leandros and #Jake are helping in the totally wrong direction! Sorry to say that...
The only solution you should use is this:
Cursor findEntry = db.query("sku_table", columns, "owner=?", new String[] { owner }, null, null, null);
ps: Yes I down voted both answers as they may work but providing a solution that shouldn't be used.
Update:
If you need more than one where condition, just add it like you would do in a normal query
Cursor findEntry = db.query("sku_table", columns, "owner=? and price=?", new String[] { owner, price }, null, null, null);
The order of the ? and the new String[] {...} elements must be the same!

Cursor findEntry = db.query("sku_table", columns, "owner='"+owner+"'", null, null, null, null);

SELECT quantity, price, owner, FROM sku_table WHERE owner='Mike' this is the correct SELECT. You forget the ' ' (single quotes)

public Cursor show_vol(String vol,String bk,String hadnu)
{
SQLiteDatabase db = this.getReadableDatabase();
String[] columns ={"hadith"};//colums name that you select
Cursor res = db.query("volume2", columns, "hadithno=?", new String[] { hadnu }, null, null, null);
//volume2 is table name and hadithno is colume name l
//select hadith from volume2 where hadithno=hadnu //working like s
1. List item
return res;
}

I know this is an old question, but you can also do it like this:
Cursor findEntry = db.query("sku_table", columns, "owner=\'"+owner+"\'", null, null, null, null);
I just did it in my app and it worked as expected.
Jake's answer was similar, but probably wouldn't work without the \ before the '

the simplest way is to use SELECT col1,col2 FROM table_name WHERE col =' something' ; just like Leandros said , my problem was the single quotes , thnx

Where clause in SQLite not working in android :(

I'm getting an annoying error when trying to query some data in SQLite.
Here is my code:
Cursor cursor= db.query(TABLE_IMAGES, new String[]{"_id"}, "name" +" = "+compareToThis, null, null, null, null);
I'm just returning the cursor as a string.
The error is saying:
no such column: compareToThis: while compiling.....the statement
My question is: why is SQLite setting the compareToThis attribute as a column when it's just a value?
How can I fix this?
Thanks in advance.

Cursor cursor= db.query(TABLE_IMAGES, new String[]{"_id"}, "name" +" = ?", new String[]{compareToThis}, null, null, null);
The selection must include placeholder for parameter, and the next argument should be the array of parameters.

The solution by Vladimir works, however if you are like me and wonder why your approach did not work initially when it should have, here is why:
It is because it expects an integer unless you used (single or double) quotation marks to indicate that it is a string.
For example, in MySql this would return no results:
SELECT * FROM clients WHERE firstName = Bob; -- This will not work.
However when you surround it with quotations, it will return a result because it identifies Bob as a String literal.
Select * FROM clients WHERE firstName = 'Bob'; -- Single quotes work.
Select * FROM clients WHERE firstName = "Bob"; -- Double quotes as well.
Therefore for it to work, you would have to surround your compareToString with single quotes, as Muhhammad mentioned within the comments.
Cursor cursor= db.query(TABLE_IMAGES, new String[]{"_id"}, "name" +'" = "+compareToThis+"'", null, null, null, null);

How check if sms/inbox is empty?

I'd like to know if we can write a short boolean test which return true if sms/inbox is empty or not.
Something like Databse("content://sms/inbox")==null?

Here's the code:
// Retrieve a Cursor pointing to the sms list and the size of it.
Uri uriSMSURI = Uri.parse("content://sms/inbox");
Cursor cur = mContext.getContentResolver().query(uriSMSURI, null, null, null, null);
boolean ret = cur.getCount() > 0;
Remember to close the cursor afterwards.

You should have a look at this , its not a simple one liner but it will give you the data you require. It seems there is no documented way to do this easily , you are going to have to do alot of manual work or hope someone has written a lib to do it all for you