String str = " Select ? , ...

Hi ,
I have a query for which I need to use PreparedStatement .The query runs likes this :-
String str = " Select ? , ename from emp where deptno ? ";
The values of ? need to be assigned dynamically.
But I cannot create Prepared Statement from this query .
If you have got answer to your questions can you inform me at
Thanks in advance

No, and you can't use a PreparedStatement where you have ? for the table name either. The database can't prepare it because it doesn't know what fields you will be asking for. So you will have to use a Statement and generate the SQL with string calculations. Sorry.

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I encountered exactly the same problem.
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hi all,
pl help me out.
i want to concatenate string to select statement like
create or replace procedure my_proc(p_sal number)
as
v_name varchar2(20);
ssql varchar2(4000);
begin
ssql := ' ';
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Pavani,
Still not clear.
"Multiple conditions" sounds like you are trying to build predicates in the where clause, but in your example it looks like you are trying to build a select clause. Also your parameter is p_sal so the where clause "sal = p_sal" is fixed.
The real question is WHY you want to "write multipul conditions"? WHY you want to "store it in a string .and then concatenate the string to next condition so on"?
Regards,
Rob.

"String str=new String("My String")" v.s. "String str="My String";

-- what's the difference bet String str="My String"; to this
String str=new String("My String");

Its a subtle one. Its also been asked a hundred times before :-)
When a java class is compiled it "interns" all the Strings it can find.
Anywhere that you use that string, gets replaced with a reference to that string.
So the first gets a reference to the interned String.
The second creates a new String, using the interned String as an argument - results in reserving new memory.
Take this code:
String str1 = "My String";
String str2 = "My String";
String str3= new String("My String");In effect the compiler turns it into something like this:
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String str1 = internedString;
String str2 = internedString;
String str3 = new String(internedString);So initially, it only stores "MyString" once, and all your String variables point at that same memory space. As Strings are immutable in java (the contents never change) this is safe to do. str3 creates a NEW String, which reserves new memory, and copies the contents of internedString into it.
So
str1 == str2 (they point to the same bit of memory)
str1 != str3 (str3 created a new String, so is in new memory)
str1.equals(str3) (the contents of the strings are the same)
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evnafets

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Hello.
In the API reference manual J2SE 5.0 (and earlyer also),
"public indexOf(String str, int fromIndex)"
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| starting at the specified index. The integer returned is the smallest value k for which:
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I can't understand why str.length() is needed here.
For example,
String string = "my beautiful dream";
String str = "ea";
int fromIndex = 10;
in the case, str.ng.indexOf(str, fromIndex) returns 15, the value is what I what to get.
But,I think the smallest value k for which
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is 4, isn't it?
import junit.framework.TestCase;
* @author phinloda
* test String.indexOf
public class IndexOfTest extends TestCase {
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 int k2 = targetString.indexOf(str, fromIndex);
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 assertEquals(k1, k2);
 private int myIndexOf(String targetStr, String str, int fromIndex) {
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 if (n >= Math.min(fromIndex, str.length()) && targetStr.startsWith(str, n)) {
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 public static void main(String[] args) {
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("this.length()" is right?, but it's nonsense.)

("this.length()" is right?, but it's nonsense.)Yes, it should be this.length() and not str.length().
I don't think it's nonsense because now the empty
string always gives a non-negative index, e.g.
"string".indexOf("", 1000) returns 6...perhaps this
property is useful for some string algorithmsI think it only does this for an empty String, so it would be clearer if the docs said something about returning this.length() if str.length()==0.

Open cursor for string and select from partition (cannot bind)

Hi,
i don't manage to use a bind variable for a select ... from ... PARTITION(...).
It doesn't work to use something like
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But that means, that the string changes each time.
Doesn't that prevent from re-use in library_cache?
best regards,
Frank

>
So i have to create the cursor string with string functions each time i change the partition.
But that means, that the string changes each time.
>
Yes it does.
Doesn't that prevent from re-use in library_cache?
>
Yes it does.
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EXPORTING
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Will this work: String str = oldString?

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String billy = bob;
bob = "bobby";Will billy = "bob" or will billy = "bobby"?
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Will billy = "bob" or will billy = "bobby"?billy = "bob".
Strings are Objects in Java, and the variables don't contain the data for the object, only a reference to it, and the reference is that only thing that changes in assignment.
I know 'C' has a str copy function...I cant
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Edited by: user11309801 on Feb 12, 2011 11:37 AM
Edited by: user11309801 on Feb 12, 2011 12:05 PM

It is always helpful to provide the following:
1. Oracle version (SELECT * FROM V$VERSION)
2. Sample data in the form of CREATE / INSERT statements.
3. Expected output
4. Explanation of expected output (A.K.A. "business logic")
5. Use \ tags for #2 and #3. See FAQ (Link on top right side) for details.
Also see the third post in this thread:
{thread:id=2174552}

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Yeah, some of the the least intuitive methods in the
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String str = " Select ? , ...

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