Describe a parameter from a prepared statement

With OCI programming, is it possible to describe a prepared statement parameter information such as the parm's OCI_ATTR_CHARSET_FORM? if possible how to check the parm information?
example:
sword rt;
wchar_t* cmd = L"select * from b3 where c2 = :1";
wchar_t* data = L"adfa";
short indicator = 0;
if(rt = OCIStmtPrepare(hpStmt, hpErr, (OraText*)cmd, (ub4)wcslen(cmd)*2, OCI_NTV_SYNTAX, OCI_DEFAULT))
checkerr(hpErr, rt);
iReturn = -1;
goto EXIT;
if(rt = OCIBindByName(hpStmt, &hpBind, hpErr, (OraText *)L":1", (sb4)4, (dvoid *)data, 4, SQLT_STR, (dvoid *)&indicator, 0, 0, 0, 0,OCI_DEFAULT))
checkerr(hpErr, rt);
iReturn = -1;
goto EXIT;
how to get parm :1 information?
if parm :1 charset form is SQLCS_NCHAR, I need set the parm's charset form before execute the statement by:
//ub1 cform = SQLCS_NCHAR;
//OCIAttrSet(hpBind, (ub4) OCI_HTYPE_BIND, (dvoid *) &cform, (ub4) 0, (ub4) OCI_ATTR_CHARSET_FORM, hpErr);
If I directly set parm's form to SQLCS_NCHAR, it would bring performance problem.
Thanks

String date;
String sql = "Select Accepts.TimeOfAccept FROM Accepts where Accepts.TimeOfAccept = 'jComboBox2';";
ResultSet result = stmt.executeQuery(sql);
date = result.getString("TimeOfAccept");
String day = date.substring(0, 2);
String month = date.substring(3, 5);
String year = date.substring(6);
i have fixed it to a point but before i get the substring i am supposed to check the formats of the metadata in case the format of the date changes the query is supposed to build dynamically off the meta data as a but i dont know how to do this i am accessing an access database to test it initially but i will be moving it onto an sql database where the date format may differ
thanking you in advance

Similar Messages

How to get a SQL-String from a (Prepared)Statement?

Hi,
I have these three lines of code:
PreparedStatement stmt = connection.prepareStatement("select * from mytable where username= ?");
stmt.setString(1, "user");
ResultSet rs = stmt.executeQuery();
Now, I want to log all SQL-Statements with log4J.
log.info(sqlstring);
Now, I want for sqlstring something like "select * from mytable where username='user' ", i. e. the PreparedStatement-String with the parameters I set.
Is there any possibility to get this string?
I searched in class PreparedStatement, in class ResultSet, in class ResultSetMetaData, but without success.
Can anybody help me?

Use a JDBC-logging library. You can use Mimer JTrace available att http://developer.mimer.com (or http://developer.mimer.se/downloads/downloads_thank.tml?a=&id=36). It should work with any JDBC driver.
/Fredrik

Show query from prepared statement

Hi all!
Does someone knows how to get the whole generated query from a prepared statement?
I want to know if the parameters are set correctly and therefore want to print it out to screen
before the query is executed.
Thanks in advance.

You can't. At least not using standard JDBC. This is partially because the driver doesn't necessarily generate a query from the prepared statement, it can make a remote procedure call instead, for example.
Alin.

Pooling Prepared Statement and Resultset

Is their any mechanism in Weblogic by which we can pool prepared statements and
resultset.

Yes you can cache prepared statements. The connection pool will
automatically cache the prepared statements (10 prepared statement was the
limit in previous so you may want to write some startup class to load the
imp prepared statements.). When you reuse the prepared statement the
connection pool will pick it from its prepared statement cache. In 6.1 you
can configure the number of prepared statements that you want to cache.
But you cannot have multiple resultsets open for the same statement object.
You can have cache rows though.
Please search the bea newsgroups for more info. There are a bunch of posts
that will be helpful to you.
http://search.bea.com/weblogic/gonews/
sree
"hogan" <[email protected]> wrote in message
news:3bd9cf88$[email protected]..
>
Is their any mechanism in Weblogic by which we can pool preparedstatements and
resultset.

Pass table name as parameter in prepared Statement

Can I pass table name as parameter in prepared Statement
for example
select * from ? where name =?
when i use setString method for passing parameters this method append single colon before and after of this parameter but table name should be send with out colon as SQL Spec.
I have another way to make sql query in programing but i have a case where i have limitation of that thing so please tell me is it possible with prepared Statment SetXXx methods or not ?
Thanks
Haroon Idrees.

haroonob wrote:
I know ? is use for data only my question is this way to pass table name as parameterI assume you mean "how can I do it?" As I have already answered "is this the way?" with no.
Well, I would say (ugly as it is) String concatenation, or stored procedures.

Dynamically obtain parameter count for a prepared statement

Hi JDBC Gurus,
Given a prepared statement, is there a way to figure out the parameter count at runtime? I need this info. to prompt the user for parameter values at the right time from my GUI tool. Any help will be greatly appreciated.

i don't know of any way to do this put perusing through the API i am wondering what the getMetaData method of PreparedStatement is supposed to do. it says returns the meta data of a ResultSet's columns but i think it could contain info about the parameters for the PreparedStatement. i guess i just don't see why that method is there... anyone?

Resultset from a batch select using prepared statement

Hi,
Is it possible to add results of batch execute of select statements and retrieve the result set ..
I am running select statement in a batch mode setting in value for a column.I add this to a prepared batch.
I would like to get the reults as a batch and spin through the result set like a r.next(). Is this possible ?
I have given the code below
sql = "select ordervalue , orderdate from discreet_orders "+
"where order_no = ? ";
dbObject.prepareStatement(sql);
dbObject.prepareStatement(sql);
for (int i=0; i < orderNoVect.size(); i++) {
dbObject.setString(1,(String)scnV.elementAt(i));
dbObject.addBatchPrepared();
r = dbObject.execPrepared();
dbObject.clearBatchPrepared();
I would like to do a r.getNext() process the values form the resultset.
Is this possible ? If not is there an other way to do it ?
Thanks
Arnold

Olek wrote:
hi
Is there a way do a batch update using prepared statement?
I don't want to insert every row in a single query...
regards,
OlekPossibly the confusion here stems from the existence of two addBatch methods in PreparedStatement.
addBatch(String sql)inherited from Statement adds a new query to the batch of SQL statements for the statement. However you don't want to use this with PreparedStatements Instead you want
addBatch()which adds the current set of parameters to the prepared statements batch of commands.
In this scenario you prepare your query (insert statement) and then call setXXX(x,y) for each parameter and then addBatch for each tuple. Then call executeBatch to execute all the queries based on your batched parameters.
If this didn't answer your question I don't know what your question is exactly. I would add that you probably want to set a "reasonable" size on your batches and break them into smaller batches as is reasonable. Mainly because the implementation of batched PreparedStatements widely varies depending on the database and driver, thus there are certainly scenarios where given enough batched parameters you could have various unpleasant things visited upon your program. Like terminal slowness, running out of memory, etc.

How do I handle NULL returns from prepared statement?

Thanks in advance to all those who respond. As a beginner with Java/JSP/JDBC, I need all the help I can get!
Here's the problem...
I'm using a prepared statement in JSP to query a MySQL database.
If there is a value to return, everything works properly.
If the query returns a NULL (empty set) value, I get the following error:
javax.servlet.ServletException: Before start of result set
Here's the code (no negative comments please...I know I'm violating some conventions! I'll restructure it later. Right now I just need help with handling the NULL case):
<%
Driver DriverAppt = (Driver)Class.forName(MM_test_DRIVER).newInstance();
Connection ConnAppt = DriverManager.getConnection(MM_test_STRING,MM_test_USERNAME,MM_test_PASSWORD);PreparedStatement StatementAppt = ConnAppt.prepareStatement("SELECT lastname FROM appts_pid1 WHERE user_id = " + Recordset1__MMColParam + " AND year = " + yy + " AND month = '" + months[mm] + "' AND date = " + dates[dd] + " AND appttime = '16:15:00'");
ResultSet Appt = StatementAppt.executeQuery();
boolean Appt_isEmpty = !Appt.first();
boolean Appt_hasData = !Appt_isEmpty;
Object Appt_data;
int Appt_numRows = 0;
%>
Thanks for the help!!!

I think I have a better handle on what's occurring here. To cut to the heart of the problem, I'm going to give a very simple example that illustrates what type of error handling I need.
HERE'S THE EXAMPLE:
Let's say that I have a database of users. There are only two columns in the database: user_id and lastname. There are only 2 users, user_id "1" has lastname "Jones" and user_id "2" has lastname "Smith".
I built a very simple web interface that let's a user enter a number to see if there's a lastname associated with that record. The user has no way of knowing if the user_id exists or not, so they may or may not enter a valid number.
If the user enters a valid user_id (in this case "1" or "2"), then the correct lastname is displayed. If the user enters an invalid user_id (in this case, anything other than "1" or "2") then I get the same "Before start of result set" error that I'm getting in my real application.
So, the question is: WHERE IN THIS CODE WOULD I HANDLE THE RETURN OF AN EMPTY SET?
The goal here is to have the sentence say "The user's lastname is .", basically returning null. If there has to be a value, then have the last sentence say "The user's lastname is unknown."
If you can solve this simple example, you'll have also solved the problem with my main application!!!! :-)
Here's the example code:
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ include file="Connections/example.jsp" %>
<%
String Recordset1__MMColParam = "1";
if (request.getParameter("user_id") !=null) {Recordset1__MMColParam = (String)request.getParameter("user_id");}
%>
<%
Driver DriverRecordset1 = (Driver)Class.forName(MM_example_DRIVER).newInstance();
Connection ConnRecordset1 = DriverManager.getConnection(MM_example_STRING,MM_example_USERNAME,MM_example_PASSWORD);
PreparedStatement StatementRecordset1 = ConnRecordset1.prepareStatement("SELECT * FROM test_table WHERE user_id = " + Recordset1__MMColParam + "");
ResultSet Recordset1 = StatementRecordset1.executeQuery();
boolean Recordset1_isEmpty = !Recordset1.next();
boolean Recordset1_hasData = !Recordset1_isEmpty;
Object Recordset1_data;
int Recordset1_numRows = 0;
%>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<form action="test.jsp" method="get" enctype="application/x-www-form-urlencoded" name="form1" target="_self">
<p> Submit a user id and a lastname will be displayed.</p>
<p>
<input type="text" name="user_id">
<input type="submit" name="" value="Submit">
</p>
</form>
<p>The User's lastname is <%=(((Recordset1_data = Recordset1.getObject("lastname"))==null || Recordset1.wasNull())?"":Recordset1_data)%>.</p>
</body>
</html>
<%
Recordset1.close();
StatementRecordset1.close();
ConnRecordset1.close();
%>
A huge "THANK YOU!!!!" to all those who've helped me here!!!

Prepared statement parameter order?

We have prepared statements for insert and update where changing the order of columns in the statement gives different results.
Problem 1:
For an update statements setting 8 column values via preparedStatement.executeUpdate, we got the following exception containing an internal error:
java.sql.SQLException: Interner Fehler: Daten-Array nicht zugewiesen
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:168)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:210)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:273)
at oracle.jdbc.dbaccess.DBDataSetImpl._setDBItem(DBDataSetImpl.java:365)
at oracle.jdbc.dbaccess.DBDataSetImpl._bindsRowCompleted(DBDataSetImpl.java:737)
at oracle.jdbc.dbaccess.DBDataSetImpl.rowCompleted(DBDataSetImpl.java:1619)
at oracle.jdbc.driver.OraclePreparedStatement.get_data_for_columns(OraclePreparedStatement.java:2343)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:362)
All statement ? parameters where bound correctly.
When we changed the order of the update's set-clauses and of the according setString parameters to the same order the table is created in the database, the statement works fine.
Problem 2:
An insert statement using a VALUES clause with not more than 10 columns works fine independent of the column order.
But if we have a table with more than 10 columns, the insert only works if the columns in the insert statement are in the same order as the database table. Otherwise we got an IndexOutOfBoundsException - looks like a array overflow in an internal array used to sort column indexes...
We are using Oracle 8.1.7 and JDBC 1.2 thin driver.
Anyone else with similar problems?

Did you try to define the Parameter name?
Like these:
strSQL="XXX(p_1=>?, p_2=>?,p_3=>?)"
cstmt.setXXX(1,'v1');
cstmt.setXXX(3,'v3');
cstmt.setXXX(2,'v2');
I am suprised, If you have so many parameter, how can you maintain you code if you do not define the parameter names?

Ouput sql from prepared statement

I'm using prepared statements and I want to output the sql that is being run in the statement to the console. For example:
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@xx.xx.x.xx:xxxx:xxxx", "xxxx", "xxxx");
stmt = conn.prepareStatement("update table set a = ? where b = ? and c = ?");
stmt.setString(1, "a");
stmt.setString(2, "b");
stmt.setString(3, "c");
System.out.println(?????????);So the statement would be something like: "update table set a = 'a' where b = 'b' and c = 'c'"
How can I get the sql from the statement? I would have thought this would be easy but there doesn't seem to be any obvious method.

I also came across the article about overpowering the PreparedStatement, neat stuff.
But as I downloaded the classes and compiled them, I got some errors due to the fact that some methods from the PreparedStatement- and Statement-interfaces were not implemented by the DebuggableStatement-class.
I suspect this has something to do with the JDK-version being used.
I myself am using version 1.4.1_01-b01.
Anyone came across this same problem?
As I do want to compile under the version mentioned, I just insert the method(-stubs) myself. Or is this a bad idea?

Prepared statement upload from URL is wierd

//This doesnt save the picture
URL url = new URL(FromJPG);
URLConnection connection = url.openConnection();
InputStream is = connection.getInputStream();
int length = is.available();
BufferedInputStream in = new BufferedInputStream(is);
//THis works great
File snapshot = new File("/at/webuploads/asp_model.jpg");
FileInputStream fileStream = new FileInputStream(snapshot);
Is there something special to get a picture from a URL and save to db. If i take this picture from the URL and write to filesystem, the pic is fine. It just wont save into db when its from a URL..any ideas?
Thanks

I figured it out. This is the end result.
//Get the image
URL url = new URL("http:yoururl.com/image/jpg");
URLConnection connection = url.openConnection();
InputStream is = connection.getInputStream();
BufferedInputStream in = new BufferedInputStream(is);
int length = in.available();
//Then add this to prepared statement
pstmt.setBinaryStream(13, in, (int)(in.available()));
Hope this helps someone download an image from a URL and insert into a database.

How to retrieve a prepared statement from prepared statement cache?

Hi All,
I have created the connection pool during application server startup. The connection pool are getting created successfully. I have also created the prepared statements and stored as part of each connection in the connection pool.
can anyone please tell me on how do I retrieve a prepared statement from prepared statement cache from a connection object.
Any pointers to info source will be REALLY appreciated.
Many Thanks in Advance,
C R Baradwaj

Raghuram Bharatwaj C wrote:
Hi Joe,
I have created a connection poool in my startup class and created the
neccessary prepared statements for a each connection. I have 10 prepared
statements to be created for each connection. I have created all the 10 prepared statements using the loop as mentioned below
String [] epc_stmts;
private java.sql.PreparedStatement[] _pstmts;
if (epc_stmts!= null)
               _pstmts = new PreparedStatement [len = epc_stmts.length];
               for (i=0; i<len; i++)
                    _pstmts[i] = db.prepareStatement (epcstmts);
I have closed the connection after the prepared statements are created.
Now, How do i access a prepared statement from the connection object.
Nothing. Are you talking about a WebLogic pool? If so, then therafter,
whenever your application gets a pool connection, when it calls
prepareStatement() with the same SQL as you prepared those statements,
it will get a cached statement. Your array is unnecessary.
Joe
>
Many Thanks in Advance,
C R Baradwaj

Escape Characters - simulate the setString from Prepared Statements

I would like to see what the value of setString() is for a given prepared statement call.
Because of reasons that would take me to long to explain that I cannot use preparedstatements with their parameters - I need a way to execute a query like the following:
String query = "insert into blahtable (somestring) values (\"asdfds\'\s sdsfdasfd \"\& ...\");
PreparedStatement stmt = connection.prepareStatement(query);
I know prepared statements can take care of this, but I want to know and write the query as above without the need of prepared statements help for string.
Below is an example with prepared statement - but not what I want to do
For example:
String oddstringwithunusalcharacters = "...";
String query = "insert into blahtable (somestring) values (?)";
PreparedStatement stmt = connection.prepareStatement(query);
stmt.setString(1, oddstringwithunusalcharacters);
I would like to see what the actual query looks like and what the actual string was passed:
--> insert into blahtable (something) values ("asdfds\'\s sdsfdasfd \"\& .... ")
It is not sufficient enough for me to escape quotes and apostrophes because there maybe other unusual characters that I do not know of since the string is passed by an unknown source.
Thank you in advance

PreparedStatements actually doesn't escape quotes. It basically precompiles statements in the DB and only passes the values to the DB.
But if you're using a plain vanilla SQL statement where you quote the string with a single quote ' then you need to escape all occurrences of exactly the same single quote ' in the actual String value. If you for example quote the string with an apostrophe ` then you just need to escape all occurrences of exactly the same apostrophe ` in the actual String value. And so on. It is nothing more than logical, is it?

Prepared statement not releasing from access db

Hello all,
I have several prepared statements like the following:
public void storeUpdate(String userId,String ws,String wm,String wl,String wx,String wxx,String bs,String bm,String bl,String bx,String bxx, String tq, String tp,Timestamp ts)
     String updatePurchase = "UPDATE store SET smallWhite=?,medWhite=?,lrgWhite=?,xlrgWhite=?,xxlrgWhite=?,smallBlue=?,medBlue=?,lrgBlue=?,xlrgBlue=?,xxlrgBlue=?,totalQty=?,totalPrice=?,ot=? WHERE playerNo='"+userId+"'";
     try{
         Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
         objConn = java.sql.DriverManager.getConnection("jdbc:odbc:myDB","","");
         PreparedStatement ps = objConn.prepareStatement(updatePurchase);
         ps.setString(1, ws);
         ps.setString(2, wm);
         ps.setString(3, wl);
         ps.setString(4, wx);
         ps.setString(5, wxx);
         ps.setString(6, bs);
         ps.setString(7, bm);
         ps.setString(8, bl);
         ps.setString(9, bx);
         ps.setString(10, bxx);
         ps.setString(11, tq);
         ps.setString(12, tp);
         ps.setTimestamp(13,ts);
         ps.executeUpdate();
         ps.close();
         objConn.close();
            catch (SQLException s)
                System.err.println("DataBase PROBLEM");
                s.printStackTrace();
            catch (Exception e)
                    System.err.println("Error in updateStore method");
                    e.printStackTrace();
} The prepared stmts seem to be "hanging on to" the access(dont laugh)table that the prepared stmt just updated. The reason I know this is because when I try to look at the table in access's design view I get a message saying:
"Microsoft access
You cant open the table 'store' for modification.
A query or form bound to the table is open, you may not have permission to open this table in design view, or another user has the table open.
If you have opened a query or form bound to this table, close it, and then try again to open the table in design view."
The only way to open the table in design view is to shut down tomcat and restart.
Should I be worried about this?
Am i forgetting to close something in my ps?
TIA!!

I use PreparedStatement all the time with Access and never have a problem. The only thing I noticed about your code is that if an exception gets thrown in your method, the close statements won't get executed. This might leave the tables locked. You might want to try moving the close statements into a finally block. That way your statement and connection will get closed if an exception gets thrown or not.

SetString in Prepared Statement

Help!
I am trying to use a prepared statement and use a setString. It seems to work when I use a value as the parameter, but when I pass it a variable I get an error. Any ideas???
THIS WORKS.....
String buffer;
String selectStmt1 = "SELECT veh_key_i FROM yzdbdat.mxtp010_veh " +
"WHERE veh_chass_no = ?";
PreparedStatement selectVehKey = connection.prepareStatement(selectStmt1);
selectVehKey.setString(1,"2H412152");
ResultSet getVehicle = selectVehKey.executeQuery();
THIS DOESN'T...I GET A RIGHT TRUNCATION ERROR
String buffer;
String selectStmt1 = "SELECT veh_key_i FROM yzdbdat.mxtp010_veh " +
"WHERE veh_chass_no = ?";
PreparedStatement selectVehKey = connection.prepareStatement(selectStmt1);
selectVehKey.setString(1,buffer);
ResultSet getVehicle = selectVehKey.executeQuery();
THANKS!!

A right truncation error? I would have expected a NullPointerException, since you haven't assigned anything to that variable. But if your real code does assign something to it, then probably it is too long to fit in the database column.

Describe a parameter from a prepared statement

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