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.

Similar Messages

Closing Statements and ResultSets

I just recently realized that you need to close Statements and ResultSets in order to avoid getting the "Too many cursors"-message.
My question is:
Do you need to close both Statements and ResultSets?
- not that it's a problem...
if so:
Does it matter which one you close first?

I usually place the stmt.close() code in my finally block, to ensure that the statement gets closed, even if a SQLException occurs during the query/update. The ResultSet does not explicitly have to be closed, ... it is automatically closed when the Statement is closed, or if a new query is run on the same statement.

JDBC: Closing Connection does it close statement and resultset

In my application I am facing ORA-0100 Maximum open cursors exceeded problem. We are executing quite a few queries and stored procedures before we close the connection object. But in few places statements and resultsets are not closed. Can these be a problem? Shouldn't they be automatically closed when the connection is closed?
We are executing this block of code in a loop.

in few places statements and
resultsets are not closed. Can these be a problem?Yes.

Statement and ResultSet Interface type of Object

Hi,
Can any one explains me where exactly (in which Class) the implementation of the Statement and ResultSet Interface type of Object Instance be created
Regards
Krishna

I dont really understand what you are trying to ask but:
Your JDBC driver has concrete implementations of Statement and Resultset. If you want to know what classes are being used try something like:Connection con = ??;
Statement st = con.createStatement();
ResultSet rs = st.executeQuery( "???" );
System.out.println( "Connection class: " + con.getClass().getName() );
System.out.println( "Statement class: " + st.getClass().getName() );
System.out.println( "ResultSet class: " + rs.getClass().getName() );

Statement,Prepared Statement and callable statement

Hi,
Please let me know in which scenario we are using Statement,Prepared Statement and callable statement.
and which is efficient one among the above.
Thanks in advance

Welcome to the forum!
>
Please let me know in which scenario we are using Statement,Prepared Statement and callable statement.
>
We don't know what scenario you are using those in or if you are using them at all. Are you asking what they are?
For document related questions you should consult the documentation or use your favorite search engine to get information.
See the Java Tutorial
http://docs.oracle.com/javase/tutorial/jdbc/basics/prepared.html
>
The main feature of a PreparedStatement object is that, unlike a Statement object, it is given a SQL statement when it is created. The advantage to this is that in most cases, this SQL statement is sent to the DBMS right away, where it is compiled. As a result, the PreparedStatement object contains not just a SQL statement, but a SQL statement that has been precompiled. This means that when the PreparedStatement is executed, the DBMS can just run the PreparedStatement SQL statement without having to compile it first.
>
The Javadocs for your Java SDK have the API for each of those classes and a description of what they are. And the Oracle JDBC Developer Guide has extensive information on how to use them.
http://docs.oracle.com/cd/B28359_01/java.111/b31224/toc.htm

MS SQL Server 7 - Performance of Prepared Statements and Stored Procedures

Hello All,
Our team is currently tuning an application running on WL 5.1 SP 10 with a MS
SQL Server 7 DB that it accesses via the WebLogic jConnect drivers. The application
uses Prepared Statements for all types of database operations (selects, updates,
inserts, etc.) and we have noticed that a great deal of the DB host's resources
are consumed by the parsing of these statements. Our thought was to convert many
of these Prepared Statements to Stored Procedures with the idea that the parsing
overhead would be eliminated. In spite of all this, I have read that because
of the way that the jConnect drivers are implemented for MS SQL Server, Prepared
Statments are actually SLOWER than straight SQL because of the way that parameter
values are converted. Does this also apply to Stored Procedures??? If anyone
can give me an answer, it would be greatly appreciated.
Thanks in advance!

Joseph Weinstein <[email protected]> wrote:
>
>
Matt wrote:
Hello All,
Our team is currently tuning an application running on WL 5.1 SP 10with a MS
SQL Server 7 DB that it accesses via the WebLogic jConnect drivers.The application
uses Prepared Statements for all types of database operations (selects,updates,
inserts, etc.) and we have noticed that a great deal of the DB host'sresources
are consumed by the parsing of these statements. Our thought was toconvert many
of these Prepared Statements to Stored Procedures with the idea thatthe parsing
overhead would be eliminated. In spite of all this, I have read thatbecause
of the way that the jConnect drivers are implemented for MS SQL Server,Prepared
Statments are actually SLOWER than straight SQL because of the waythat parameter
values are converted. Does this also apply to Stored Procedures???If anyone
can give me an answer, it would be greatly appreciated.
Thanks in advance!Hi. Stored procedures may help, but you can also try MS's new free type-4
driver,
which does use DBMS optimizations to make PreparedStatements run faster.
Joe
Thanks Joe! I also wanted to know if setting the statement cache (assuming that
this feature is available in WL 5.1 SP 10) will give a boost for both Prepared Statements
and stored procs called via Callable Statements. Pretty much all of the Prepared
Statements that we are replacing are executed from entity bean transactions.
Thanks again

Oracle Prepared Statement and spaces in field

I have a field that is defined as char(10). It has characters like '39' in it. When I select against it using standard SQL (where clause) I get results. When I use it in the where clause of a prepared statement it does not return any rows.
If I have the field defined as char(2) the prepared statement works.
If I have the field defined as varchar2(10) and loaded with '39' the prepared statement works.
If I have the field defined as varchar2(10) and loaded with '39 ' the prepared statement returns no results.
I really do not think this is a JDBC problem. However, since Oracle's site basically <expletive deleted>, I am hoping someone here has a solution.
Thanks in advance if you can help.

Let me clarify.
I cannot remove the whitespace from the data in the database. I do not need the whitespace to do the query if I am not using a Prepared Statement. This seems to be a problem with the way Oracle is handling the prepared statement. (hence.. my thinking that this is really not a JDBC problem at all.. but I could be wrong.)

Prepared Statement and DEFAULT identifier

Does anyone know how to pass the identifier DEFAULT to a PreparedStatement?
I am processing a text file to import into a database table (Oracle 9i) via JDBC. The user is able to configure what will happen if the data in the file doesn't match the types required by the database and so I do a quick check that the data is of the right type before it gets to the database. The user can choose to have the invalid value replaced with the default associated with that field (as configured on the database table). Eg. Table setup is
CREATE TABLE "TEST1" (
"TESTFIELD1" VARCHAR2(40 byte),
"TESTFIELD2" VARCHAR2(40 byte) NOT NULL,
"TESTFIELD3" NUMBER(30, 10) DEFAULT 777)
sample data of 'abc', 'def', 'www' should therefore end up as 'abc', 'def', 777
The problem I have is that I'm using a PreparedStatement to do the INSERTs (there could potentially be thousands of them).
The following SQL is what I'm trying to emulate...
INSERT INTO table (field1, field2, field3) VALUES ('abc', 'def', DEFAULT);
BUT, I am using a PreparedStatment via JDBC with bind variables ...
pstmt = con.prepareStatement("INSERT INTO table (field1, field2, field3) VALUES (?, ?, ?)");
ps.setString(1, "abc");
ps.setString(2, "def");
ps.setsomething(3, something); <- what goes here?
I have no idea what to put in the "something" bits so that DEFAULT is passed through. I obviously can't use setString(3, "DEFAULT"); as I'll just get an Oracle type mismatch error.
I realise that I could just leave out the 3rd variable and the default would be inserted automatically - but because some of the rows in the input file may have a valid value for field3 I don't always want the default value. Using the straight SQL is not an option due to the performance (or lack thereof).
Any ideas would be greatly appreciated! Thanks!

As for the best of my knowledge if you set the value to be null in the prepared Statement while setting that
for insert statement internally it is set to DEFAULT in ORACLE..
More over i thought that this will be usefull for u..
setNull
public void setNull(int paramIndex,
int sqlType,
String typeName)
throws SQLExceptionSets the designated parameter to SQL NULL. This version of the method setNull should be used for user-defined types and REF type parameters. Examples of user-defined types include: STRUCT, DISTINCT, JAVA_OBJECT, and named array types.
setNull
public void setNull(int parameterIndex,
int sqlType)
throws SQLExceptionSets the designated parameter to SQL NULL.
Note: You must specify the parameter's SQL type.
Parameters:
parameterIndex - the first parameter is 1, the second is 2, ...
sqlType - the SQL type code defined in java.sql.Types
Throws:
SQLException - if a database access error occurs
ALL THE BEST

Prepared Statement and Stored Procedure..

I have about 200 SQL statement in my Java application
I have two options either to convert into
Stored procedures
or to convert into prepared statement ....
Please guide me which options should be best....
I need difference
1)in term of speed.
2)Memory..
Regards
Mahesh
Senior DBA

club your statements on the basis of related functionalities and change it to stored procedures as it will redudce no. of calls to the database and will be faster to fetch data in one go and even reduce the memory requirements.

Prepared Statement and Stored Procedure difference?

For SQL in my web applications I use PreparedStatement object alot in my JDBC working with Oracle 9i.
I also heard the term Stored Procedure. What is the difference between Stored Procedure and Prepared Statement?

I am new to java programming, can anybody explain
what exactly precompiled means
Thank you
PalspaceWhat does you subject line have to do with your question?
The difference between a stored proc and a prepared statement is mainly this.
A stored proc is stored in the database server permanently and can be used and re-used from a different connections.
A PreparedStatement is not valid across connections.
Stored procs are almost always precompiled. (I am just hedging a bit here just in case but you can consider it 100%)
PreparedStatements MAY be precompiled. Hard to say.
Precompiling means at least one of and perhaps all of the following depending on the database
- The parsing of the SQL statement
- The checking of the SQL against the data dictionary to ensure that the tables and columns referenced actually exist
- The preparation of a query plan
Last but not least Stored procedures may (and often do) contain more than simple queries but are in fact relatively complex programs written in a DB specific language (an offshoot of SQL of some sort).

Prepared statement and DELETE returns 0 count

when executing an oracle prepared statement, the count returned is allways 0 for DELETE. However, if doing an INSERT, the count returned is correct
public void CreatePreparePurgeRcdSetArray(String sql, int i, int max, boolean create) throws SQLException,Exception
if (create == true)
          if (preparedStatementArray == null)
               preparedStatementArray = new PreparedStatement[max];
          int scroll_type = getScrollType();
               if (sql.compareTo("NOT_USED") == 0)
                    preparedStatementArray[i] = null;
               else
                    preparedStatement          = (connClass.getConn()).prepareStatement(sql);
                    preparedStatementArray[i] = preparedStatement;
                    preparedStatement          = null;
else
     closePrepareStatementArray(max);
public int UpdatePreparePurgeRcdSet(Vector smry, String sqlP, int i) throws SQLException,Exception
     Object[] searchs = (Object[])smry.elementAt(0);
     /*java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
     String aaa = searchs[1].toString();
     String aab = searchs[1].toString();
     java.util.Date                     dtx = sdf.parse(aaa);
     java.util.Date                     dty = sdf.parse(aab);
     oracle.sql.DATE aa1 = new DATE(new Timestamp(dtx.getTime()));
     oracle.sql.DATE aa2 = new DATE(new Timestamp(dty.getTime()));
     java.sql.Timestamp      ts1 = (java.sql.Timestamp) searchs[1] ;
     java.sql.Timestamp      ts2 = (java.sql.Timestamp) searchs[5] ;
     boolean oracle = true;
     boolean debug = true;
          if ((oracle == true) && (debug == true))
               String sql1 = "INSERT INTO FFI_MASTER_PURGE_TBL values ('lmill', 'OSTDEVT', 'sdsadmin', ?, 30, 60, '0', 2, 'ZZZ', ' ')";
               String sql2 = "DELETE FROM TDSADMIN.FFI_MASTER_PURGE_TBL where FORMATCATEGORY = ?";
               String sql3 = "DELETE from TDSADMIN.SUMMARY_TBL where (ML_STI_SRC_SYS_CD = ?) AND (ML_STI_CYCLE_CD = ?) AND (ML_STI_FILE_ID = ?)";
               preparedStatement = (connClass.getConn()).prepareStatement(sql3);
               //preparedStatement.setString(1, "test");
               preparedStatement.setString(1, "618");
               preparedStatement.setString(2, "0114200601");
               preparedStatement.setString(3, "00001591");
               oraclePreparedStatement = (OraclePreparedStatement)preparedStatement;
               recsDeleted = oraclePreparedStatement.executeUpdate();
          if (oracle == true)
          preparedStatement = preparedStatementArray;
          //oraclePreparedStatement.setExecuteBatch (3);
          // ML_STI_SRC_SYS_CD
          preparedStatement.setString(1, searchs[0].toString());
               // ML_STI_SRCSYS_DTTM
          //preparedStatement.setTimestamp(2, ts1);
          //preparedStatement.setObject(2, aa1);
          // ML_STI_CYCLE_CD
          preparedStatement.setString(2, searchs[2].toString());
               // ML_STI_FILE_ID
          preparedStatement.setString(3, searchs[3].toString());
               // ML_STI_LOAD_DTTM
          //preparedStatement.setTimestamp(5, ts2);
          //preparedStatement.setObject(5, aa2);
     else
               preparedStatement = preparedStatementArray[i];
          // ML_STI_SRC_SYS_CD
          preparedStatement.setString(1, searchs[0].toString());
               // ML_STI_SRCSYS_DTTM
          preparedStatement.setTimestamp(2, ts1);
          // ML_STI_CYCLE_CD
          preparedStatement.setString(3, searchs[2].toString());
               // ML_STI_FILE_ID
          preparedStatement.setString(4, searchs[3].toString());
               // ML_STI_LOAD_DTTM
          preparedStatement.setTimestamp(5, ts2);
     DateClass dateClass = new DateClass();
          String startTime = dateClass.calToFormattedDateExact();
          try
               if (oracle == true)
                    //int batch_val = oraclePreparedStatement.getExecuteBatch();
                    oraclePreparedStatement = (OraclePreparedStatement)preparedStatement;
                    recsDeleted = oraclePreparedStatement.executeUpdate();
                    //recsDeleted = oraclePreparedStatement.sendBatch();
               else
                    recsDeleted = preparedStatement.executeUpdate();
catch(SQLException e)
     String err = (e.getMessage()).substring(0,e.getMessage().length()-1);
     systemClass.logSqlStatement(sqlP + " : " + err, startTime);
throw e;
Message was edited by:
user539085
Message was edited by:
user539085
Message was edited by:
user539085

user539085,
I guess it returns 0 (zero) because it doesn't delete anything. Can you verify that it did delete some records and still returned zero?
Good Luck,
Avi.

Prepared Statements and Oracle functions:

Consider this code:
String searchText = "someInputText";
StringBuffer sqlstmt = new StringBuffer();
sqlstmt.append("SELECT ID_FIELD FROM ");
sqlstmt.append("MY_TABLE WHERE NAME_FIELD ");
sqlstmt.append("like INITCAP('%" + searchText + %')");
PreparedStatement ps = con.prepareStatement(sqlstmt.toString());This works fine like this, but when I replace the searchText in the sqlstmt to ? it doesn't work:
sqlstmt.append("like INITCAP('?')");
PreparedStatement ps = con.prepareStatement(sqlstmt.toString());
ps.setString(1, "%" + searchText + "%");How do you use the PreparedStatement with a
function like INITCAP where you need to use a
dynamic ? in the sql statement?
Thanks,
Rob.

Very easy to miss this.
Don't put the percentages IN the SQL statement.
Append the percentages to your string.
Like this:
String searchText = "%" + "someInputText" + "%";
StringBuffer sqlstmt = new StringBuffer();
sqlstmt.append("SELECT ID_FIELD FROM ")
.append("MY_TABLE WHERE NAME_FIELD ")
.append("like INITCAP(?)");
PreparedStatement ps = con.prepareStatement(sqlstmt.toString());
ps.setString(1, searchText);
resultSet = ps.executeQuery();Wish I saw this earlier for you.

Handling ' and " in a Prepared Statement

Hi,
I am using a prepared statement (WebLogic Portal Server having JDBC communication with MS SQL server)
I HAVE to pass a string like '"*ABC*"'
i.e. <single quote><double quote>*ABC<double quote><single quote>
If i hard code this value within the prepared statement it works.
If i try to pass it as argument it fails.
In my case the user may submit any string value in the place of ABC
Kindly advise
regards
-Ramudu

You're probably trying to include the quotes in the prepared statement and pass the ABC as the text to substitute for the question mark. It doesn't really work like that. It's all or nothing. Create your parameter like this:
public String quoteWrapper(final String unwrappedParameter) {
return "'\"*"+unwrappedParameter+"*\"'";
}

Beginner question about prepared statements...PLEASE help! :-)

First let me say thanks for the assistance. This is probably really easy to do, but I'm new to JSP and can't seem to figure it out.
I want to dynamically populate a table that shows whether a particular person has an appointment at a given date and time with a user. To do this, I want to query the MySQL database for the lastname of the person with the appointment that occurs with the user at the year, month, date, and time, in question.
THE CODE BELOW DOESN'T WORK (obviously) BUT SOMEWHAT ILLUSTRATES WHAT I'M TRYING TO ACCOMPLISH:
<%
Driver DriverTestRecordSet = (Driver)Class.forName(MM_website_DRIVER).newInstance();
Connection ConnTestRecordSet = DriverManager.getConnection(MM_website_STRING,MM_website_USERNAME,MM_website_PASSWORD);
PreparedStatement StatementTestRecordSet = ConnTestRecordSet.prepareStatement("SELECT lastname FROM appts_pid1 WHERE user_id='<%=(((Recordset1_data = Recordset1.getObject(user_id))==null || Recordset1.wasNull())?"":Recordset1_data)%>' AND year='<%= yy %>' AND month='<%= months[mm] %>' AND date='<%= dates[dd] %>' AND appttime='16:15:00'");
ResultSet TestRecordSet = StatementTestRecordSet.executeQuery();
boolean TestRecordSet_isEmpty = !TestRecordSet.next();
boolean TestRecordSet_hasData = !TestRecordSet_isEmpty;
Object TestRecordSet_data;
int TestRecordSet_numRows = 0;
%>
The real problem comes in the prepared statement portion. If I build the prepared statement with static values like below, EVERYTHING WORKS GREAT:
PreparedStatement StatementTestRecordSet = ConnTestRecordSet.prepareStatement("SELECT lastname FROM appts_pid1 WHERE user_id='1' AND year='2002' AND month='October' AND date='31' AND appttime='16:15:00'");
But when I try to use dynamic values, everything falls apart. It's not that the values aren't defined, I use the user_id, year <%= yy %>, month <%= months[mm] %>, etc. elsewhere on the page with no problems. It's just that I can't figure out how to use these dynamic values within the prepared statement.
Thanks for reading this far and thanks in advance for the help!!!!

Hi PhineasGage
You are little bit wrong in your
your preparedStatement.
Expression tag within scriptlet tag is invalid.
Whenever you are appending the statement with
expression tag, append it with "+" and remove
expression tag.
Hopefully it will work
ThanksThanks for the response!
I know that the expression tag within scriptlet tag is invalid. I just need a workaround for what I want to do.
I'm unclear what you mean by "Whenever you are appending the statement with expression tag, append it with a "+" and remove expression tag".
Could you give an example?
In the meantime, I've been trying to digest the docs on prepared statements and have changed the code to look like:
PreparedStatement StatementTestRecordSet = ConnTestRecordSet.prepareStatement("SELECT lastname FROM appts_pid1 WHERE user_id= ? AND year= ? AND month= ? AND date= ? AND appttime='13:15:00'");
StatementTestRecordSet.setInt(1,1);
StatementTestRecordSet.setInt(2,2002);
StatementTestRecordSet.setString(3,"October");
StatementTestRecordSet.setInt(4,31);
Again, WITH THE STATIC VALUES, THIS WORKS FINE...but when I try to use expressions or variables like below, things don't work:
StatementTestRecordSet.setInt(2,<%= yy %>);
Obviously, I'm doing something wrong, but there has to be a way to use variables within the prepared statement.
ALSO, the values are being passed to this page via URL in the form:
samplepage?user_id=1&year=2002&month=October&date=31
Based upon this information, is there another way (outside of stored procedures in the db) to do what I want to do? I'm open to ideas.

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.

Pooling Prepared Statement and Resultset

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