Using A callable statement in java
Hi all im trying to get results back from the database using a callable statement the problem is that it is placing / infront of single quotes.I need to get rid of this because it's not returning anything
here is my code
CallableStatement statementOne;
statementOne = ComparitiveAnalysisGUI.conn.prepareCall("{call graphProc(?,?,?,?,?,?,?)}");
statementOne.setString(1,"\"date_format(calldate, '%Y-%m-%d H:59:59'),avg(billsec)\"");
statementOne.setString(2,"Clovercdr");
statementOne.setString(3,start);
statementOne.setString(4,end);
statementOne.setString(5,"Boksburg");
statementOne.setString(6,"\"billsec > 0 and Network = " + network + "\"");
statementOne.setString(7,"\"date_format(calldate, '%Y-%m-%d %H:M:S')\"");
System.out.println(statementOne.toString());
rs = statementOne.executeQuery();
the result of the println is
com.mysql.jdbc.CallableStatement@ec4a87: CALL graphProc('"date_format(calldate, \'%Y-%m-%d %H:59:59\'),avg(billsec)"','Clovercdr','\'2006-03-14 00:00:01\'','\'2006-03-14 23:59:59\'','Boksburg','"billsec > 0 and Network = \'SAMobile\'"','"date_format(calldate, \'%Y-%m-%d %H:M:S\')"')
as you can see quite a mess please help if you can get the statement to look as follows
CALL graphProc("date_format(calldate, '%Y-%m-%d %H:59:59'),avg(billsec)",'Clovercdr','2006-03-14 00:00:01','2006-03-14 23:59:59','Boksburg',"billsec > 0 and Network = 'SAMobile'","date_format(calldate, '%Y-%m-%d %H:M:S')")
thanks Brian
Ok in order to understand why I did what I did parhaps it would be best if you saw my Stored procedure
create procedure graphProc(col varchar(100),company varchar(20),startTime datetime,endTime datetime,branchName varchar(20),andSection varchar(200),groupSec varchar(100))
BEGIN
SET @stmt := CONCAT("SELECT ",col," from ",company," where calldate between '",startTime,"' and '",endTime,"' and branchName = '",branchName,"' and ",andSection," Group by ",groupSec);
PREPARE stmt1 from @stmt;
EXECUTE stmt1;
the call is for example
call graphProc("date_format(calldate, '%Y-%m-%d %H:59:59'),avg(billsec)",'Clovercdr','2006-03-01 00:00:01','2006-03-14 23:59:59','Boksburg',"billsec > 0 and date_format(calldate, '%k') BETWEEN 7 AND 19 and Network = 'SAMobile'","date_format(calldate, '%Y-%m-%d %H:M:S')")//
as you can see In MySQL the "date_format(calldate, '%Y-%m-%d %H:59:59'),avg(billsec)" has to be quoted like this, so it can recognise it as a single parameter, since , '%Y-%m-%d %H:59:59' is viewed as another parameter
thaks for your reply
Brian
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stmt.executeUpdate(addRental5);
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stmt.executeUpdate(addRental7);
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String currentURL;//a variable that allows the URL to be displayed in a combo box
public QueryTableModel(){//a constructor
cache=new Vector();//constructs an empty vector so that its internal data array has size 10 and its standard capacity increment is zero
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");//used by opening a JDBC connection using an URL
}//end try
catch(Exception e){
System.out.println("problem loading the driver ");//an error message
}//end catch
}//end QueryTableModel
public String getColumnName(int i){//Returns the designated column's name
return headers;//returns the name of each column in the three table
}//end getColumnName
public int getColumnCount(){//Returns the number of columns in the column model
return colCount;//returns the number of columns in the three tables
}//end getColumnCount
public int getRowCount(){//Returns the number of rows in this table's model
return cache.size();//returns the number of components in the vector
}//end getRowCount
public Object getValueAt(int row, int col){//Returns the cell value at row and column
return ((String[])cache.elementAt(row))[col];//Returns the component at the specified index
}//end getValueAt
public void setHostURL(){//sets the URL for the database
String url = "jdbc:odbc:VideoLibrary";//a variable that allows a connection to be made to a database called VideoLibrary
closeDB();//invokes the method closeDB()
try{
db=DriverManager.getConnection(url,"","");//tries to create a connection with the database using the DriverManager class
statement=db.createStatement();//Creates a Statement object for sending SQL statements to the database
}//end try
catch(Exception e){
System.out.println("Could not initialize the database.");//an error message
e.printStackTrace();//a Throwable method that prints this throwable and it's backtrace to the standard error stream
}//end catch
}//end setHostURL
public void setQuery(String q){//sets the kind of query that is to be sent to the database
cache=new Vector();//constructs an empty vector so that its internal data array has size 10 and its standard capacity increment is zero
String s="select * from Product";//a variable that causes all the data that is in the product table to be displayed in a JTable, which also means that all the data that is in both the member and rental tables can also be displayed in a JTable
try{
ResultSet rs=statement.executeQuery(q);//an interface that is used to generate a database result set by executing a statement that queries the database
ResultSetMetaData meta=rs.getMetaData();//an interface that is used to get information about the types and properties of the columns in a ResultSet object
colCount=meta.getColumnCount();//Returns the number of columns in this ResultSet object
headers=new String[colCount];//gets the name of each column in the three tables
for(int h=1;h<=colCount;h++){
headers[h-1]=meta.getColumnName(h);//Get the designated column's name
}//end for
while(rs.next()){
String[] record=new String[colCount];//stores the name of each column in the three tables in memory
for(int i=0;i<colCount;i++){
record[i]=rs.getString(i+1);//Retrieves the value of the designated column in the current row of this ResultSet object as a String
}//end for
cache.addElement(record);//Adds the specified component to the end of this vector, increasing its size by one
}//end while
fireTableChanged(null);//Forwards the given notification event to all TableModelListeners that registered themselves as listeners for this table model
}//end try
catch(Exception e){
cache=new Vector();//constructs an empty vector so that its internal data array has size 10 and its standard capacity increment is zero
e.printStackTrace();//a Throwable method that prints this throwable and it's backtrace to the standard error stream
}//end catch
}//end setQuery
public void initDB(String url){
try{
db=DriverManager.getConnection(url);//tries to create a connection with the database using the DriverManager class
statement=db.createStatement();//Creates a Statement object for sending SQL statements to the database
}//end try
catch(Exception e){
System.out.println("Could not initialize the database.");//an error message
e.printStackTrace();//a Throwable method that prints this throwable and it's backtrace to the standard error stream
}//end catch
}//end initDB
public void closeDB(){
try{
if(statement!=null){
statement.close();//Releases this Statement object's database and JDBC resources immediately instead of waiting for this to happen when it is automatically closed
}//end if
if(db!=null){
db.close();//Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released
}//end if
}//end try
catch(Exception e){
System.out.println("Could not close the current connection.");//an error message
e.printStackTrace();//a Throwable method that prints this throwable and it's backtrace to the standard error stream
}//end catch
}//end closeDB
}//end class QueryTableModelhere's an uncommented version of the code.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.JOptionPane;
import java.sql.*;
public class Demo extends JFrame{
static String url = "jdbc:odbc:VideoLibrary";
static Statement stmt;
static Connection con;
JTextField hostField;
JTextField queryField;
QueryTableModel qtm;
JComboBox comboBox;
public static void main(String args[]){
int choice=-1;
do{
choice=getChoice();
if(choice!=0){
getSelected(choice);
}while(choice!=5);
System.exit(0);
public static int getChoice(){
String choice;
int ch;
choice = JOptionPane.showInputDialog(null,"1. Maintain product details\n"+"2. Maintain member details\n"+"3. Maintain rental details\n"+"4. View product, member and rental details\n"+"5. Log Off\n\n"+"Enter your choice");
ch = Integer.parseInt(choice);
return ch;
public static void getSelected(int choice){
if(choice==1){
maintainProductDetails();
if(choice==2){
maintainMemberDetails();
if(choice==3){
maintainRentalDetails();
if(choice==4){
Demo test = new Demo();
test.setVisible(true);
public static Connection getConnection(){
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
catch(java.lang.ClassNotFoundException e){
System.err.print("ClassNotFoundException: ");
System.err.println(e.getMessage());
try {
con=DriverManager.getConnection(url,"","");
catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
return con;
public static void maintainProductDetails(){
Connection con = getConnection();
String addProduct1, addProduct2, addProduct3, addProduct4, addProduct5, addProduct6, addProduct7, addProduct8, addProduct9, addProduct10;
addProduct1 = "insert into Product values (110001, 'The Killers - Sams Town', 5.00, 'G', 'CD', 2006)";
addProduct2 = "insert into Product values (110002, 'Robbie Williams - Rudebox', 5.00, 'G', 'CD', 2006)";
addProduct3 = "insert into Product values (110003, 'Razorlight - Razorlight', 5.00, 'G', 'CD', 2006)";
addProduct4 = "insert into Product values (110004, 'My Chemical Romance - The Black Parade', 5.00, 'G', 'CD', 2006)";
addProduct5 = "insert into Product values (110005, 'Snow Patrol - Eyes Open', 5.00, 'G', 'CD', 2006)";
addProduct6 = "insert into Product values (110006, 'Scissor Sisters - Ta-Dah!', 5.00, 'G', 'CD', 2006)";
addProduct7 = "insert into Product values (110007, 'Lovesounds - Justin Timberlake', 5.00, 'G', 'CD', 2006)";
addProduct8 = "insert into Product values (110008, 'Director - We thrive on big cities', 5.00, 'G', 'CD', 2006)";
addProduct9 = "insert into Product values (110009, 'Roxette - Roxette hits', 5.00, 'G', 'CD', 2006)";
addProduct10 = "insert into Product values (110010, '***** Cat Dolls - PCD', 5.00, 'G', 'CD', 2006)";
try {
stmt = con.createStatement();
stmt.executeUpdate(addProduct1);
stmt.executeUpdate(addProduct2);
stmt.executeUpdate(addProduct3);
stmt.executeUpdate(addProduct4);
stmt.executeUpdate(addProduct5);
stmt.executeUpdate(addProduct6);
stmt.executeUpdate(addProduct7);
stmt.executeUpdate(addProduct8);
stmt.executeUpdate(addProduct9);
stmt.executeUpdate(addProduct10);
stmt.close();
con.close();
catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
public static void maintainMemberDetails(){
Connection con = getConnection();
String addMember1, addMember2, addMember3, addMember4, addMember5, addMember6, addMember7, addMember8, addMember9, addMember10;
addMember1 = "insert into Member values (1234, 'Ann', 'Smyth', 'Upper Killult, Falcarragh, Co. Donegal', '(074)-9135210', '(087)-2030172', #5/11/85#, #5/12/06#)";
addMember2 = "insert into Member values (2345, 'John', 'Murphy', 'Lower Killult, Falcarragh, Co. Donegal', '(074)-9135211', '(087)-2030173', #4/12/85#, #6/13/06#)";
addMember3 = "insert into Member values (1324, 'James', 'McFadden', 'Lower Ardsbeg, Gortahork, Co. Donegal', '(074)-9165314', '(087)-2030171', #4/11/85#, #6/14/06#)";
addMember4 = "insert into Member values (1235, 'Frankie', 'Ferry', 'Ardsmore, Gortahork, Co. Donegal', '(074)-9165325', '(087)-2031234', #6/13/60#, #6/15/06#)";
addMember5 = "insert into Member values (1236, 'Daniel', 'McKimm', 'Ballyness, Falcarragh, Co. Donegal', '(074)-9135212', '(087)-2030184', #5/14/73#, #6/16/06#)";
addMember6 = "insert into Member values (2346, 'Stephen', 'Doohan', 'Ballyness, Falcarragh, Co. Donegal', '(074)-9135213', '(087)-2030185', #6/13/85#, #5/13/06#)";
addMember7 = "insert into Member values (2347, 'James', 'Ferry', 'Meenlaragh, Gortahork, Co.Donegal', '(074)-9165360', '(087)-2031345', #9/12/85#, #5/14/06#)";
addMember8 = "insert into Member values (2348, 'Liam', 'Cannon', 'Derryconner, Gortahork, Co.Donegal', '(074)-9165324', '(087)-2031456', #4/11/86#, #5/15/06#)";
addMember9 = "insert into Member values (2401, 'Ciaran', 'Ferry', 'Brinalack, Gweedore, Co.Donegal', '(074)-9176425', '(087)-2030282', #9/12/85#, #5/16/06#)";
addMember10 = "insert into Member values (2402, 'Ciaran', 'McGee', 'Derrybeg, Gweedore, Co.Donegal', '(074)-9176536', '(087)-2030393', #9/14/85#, #5/18/06#)";
try{
stmt = con.createStatement();
stmt.executeUpdate(addMember1);
stmt.executeUpdate(addMember2);
stmt.executeUpdate(addMember3);
stmt.executeUpdate(addMember4);
stmt.executeUpdate(addMember5);
stmt.executeUpdate(addMember6);
stmt.executeUpdate(addMember7);
stmt.executeUpdate(addMember8);
stmt.executeUpdate(addMember9);
stmt.executeUpdate(addMember10);
stmt.close();
con.close();
catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
public static void maintainRentalDetails(){
Connection con = getConnection();
String addRental1, addRental2, addRental3, addRental4, addRental5, addRental6, addRental7, addRental8, addRental9, addRental10;
addRental1 = "insert into Rental values (110001, 'The Killers - Sams Town', 1234, 'Ann', 'Smyth', #9/01/06#, #9/10/06#, 'Yes', 2.00)";
addRental2 = "insert into Rental values (120001, 'Mission Impossible 3', 2345, 'John', 'Murphy', #9/02/06#, #9/09/06#, 'No', 0.00)";
addRental3 = "insert into Rental values (130001, 'Need for Special Carbon', 1324, 'James', 'McFadden', #9/03/06#, #9/12/06#, 'Yes', 2.00)";
addRental4 = "insert into Rental values (110002, 'Robbie Williams - Rudebox', 1235, 'Frankie', 'Ferry', #9/04/06#, #9/11/06#, 'No', 0.00)";
addRental5 = "insert into Rental values (120015, 'Prime', 1236, 'Daniel', 'McKimm', #9/05/06#, #9/14/06#, 'Yes', 2.00)";
addRental6 = "insert into Rental values (130015, 'FIFA 07', 2346, 'Stephen', 'Doohan', #9/06/06#, #9/13/06#, 'No', 0.00)";
addRental7 = "insert into Rental values (110009, 'Roxette - Roxette hits', 2347, 'James', 'Ferry', #9/07/06#, #9/16/06#, 'Yes', 2.00)";
addRental8 = "insert into Rental values (120003, 'The Break Up', 2348, 'Liam', 'Cannon', #9/08/06#, #9/15/06#, 'No', 0.00)";
addRental9 = "insert into Rental values (130027, 'Gears of War', 2401, 'Ciaran', 'Ferry', #9/09/06#, #9/18/06#, 'Yes', 2.00)";
addRental10 = "insert into Rental values (110021, 'Scooter - Mind the Gap', 2402, 'Ciaran', 'McGee', #9/10/06#, #9/17/06#, 'No', 0.00)";
try{
stmt = con.createStatement();
stmt.executeUpdate(addRental1);
stmt.executeUpdate(addRental2);
stmt.executeUpdate(addRental3);
stmt.executeUpdate(addRental4);
stmt.executeUpdate(addRental5);
stmt.executeUpdate(addRental6);
stmt.executeUpdate(addRental7);
stmt.executeUpdate(addRental8);
stmt.executeUpdate(addRental9);
stmt.executeUpdate(addRental10);
stmt.close();
con.close();
catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
public Demo(){
super("Demo Test Frame");
setSize(350, 200);
comboBox = new JComboBox();
comboBox.addItem("jdbc:odbc:VideoLibrary");
qtm = new QueryTableModel();
JTable table = new JTable(qtm);
JScrollPane scrollpane = new JScrollPane(table);
JPanel p1 = new JPanel();
p1.setLayout(new GridLayout(3, 2));
p1.add(comboBox);
p1.add(new JLabel("Enter your query: "));
p1.add(queryField = new JTextField());
p1.add(new JLabel("Click here to send: "));
JButton jb = new JButton("Search");
jb.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
qtm.setHostURL();
qtm.setQuery(queryField.getText().trim());
p1.add(jb);
getContentPane().add(p1, BorderLayout.NORTH);
getContentPane().add(scrollpane, BorderLayout.CENTER);
import java.sql.*;
import java.io.*;
import java.util.Vector;
import javax.swing.*;
import javax.swing.table.*;
public class QueryTableModel extends AbstractTableModel{
Vector cache;
int colCount;
String[] headers;
Connection db;
Statement statement;
String currentURL;
public QueryTableModel(){
cache=new Vector();
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
catch(Exception e){
System.out.println("problem loading the driver ");
public String getColumnName(int i){
return headers;
public int getColumnCount(){
return colCount;
public int getRowCount(){
return cache.size();
public Object getValueAt(int row, int col){
return ((String[])cache.elementAt(row))[col];
public void setHostURL(){
String url = "jdbc:odbc:VideoLibrary";
closeDB();
try{
db=DriverManager.getConnection(url,"","");
statement=db.createStatement();
catch(Exception e){
System.out.println("Could not initialize the database.");
e.printStackTrace();
public void setQuery(String q){
cache=new Vector();
String s="select * from Product";
try{
ResultSet rs=statement.executeQuery(q);
ResultSetMetaData meta=rs.getMetaData();
colCount=meta.getColumnCount();
headers=new String[colCount];
for(int h=1;h<=colCount;h++){
headers[h-1]=meta.getColumnName(h);
while(rs.next()){
String[] record=new String[colCount];
for(int i=0;i<colCount;i++){
record[i]=rs.getString(i+1);
cache.addElement(record);
fireTableChanged(null);
catch(Exception e){
cache=new Vector();
e.printStackTrace();
public void initDB(String url){
try{
db=DriverManager.getConnection(url);
statement=db.createStatement();
catch(Exception e){
System.out.println("Could not initialize the database.");
e.printStackTrace();
public void closeDB(){
try{
if(statement!=null){
statement.close();
if(db!=null){
db.close();
catch(Exception e){
System.out.println("Could not close the current connection.");
e.printStackTrace(); -
Hi,
The possibilities can be of various reasons, with the sql statements,
xml descriptors, data sources, improper drivers anything. To crack down
the solution, kindly let me know the error messages and what exactly are
you trying to accomplish.
Thanks & Regards
Raj
manimaran t wrote:
what may be the cause of this error java.sql.SQLException: invalid sql
type passed to callable statement in iplanet ussing JNDI
Try our New Web Based Forum at http://softwareforum.sun.com
Includes Access to our Product Knowledge Base! -
How to return Multiple ResultSets Using Callable Statement
hi everybody,
while i was working with callable statements i came across a problem of how to fetch Multiple Resultsets by means of Stored Procedures written for tables in Oracle.
If any one can help me, pls do help me with a detailed explanation, and if possible do get me a example source code too.
khumaarI have a similar problem with oracle and jdbc:
I want to send a sql query like:
sqlQuery = "select n1, n2 from table1; select n1, n2
from table2"
I used a prepared statement, but when I call
.execute(sqlQuery)
oracle doesn't like this,
can someone help on this?Try putting a begin/end around it. Play with the syntax first in sqlplus.
You do realize that you MUST extract using the syntax for extracting multiple result sets correct? It will NOT work as one result set. -
Calling a procedure/function in CO using Callable Statement
Hi,
Please help me in understanding this:
__method1__
BEGIN
:1 := Package.Function(
param1 => :2"
,param2 => :3"
,param3 => :4"
,param4 => :5"
END;
method2
BEGIN
Package.Function(:1, :2, :3, :4, :5);"
END;
Whats the significance of using method1?
I have seen the callable statements written as in method1 but, the parameters passed are not in order and not all params are passed.
When i tried writing similar code, I got "Invalid Column Index" exception. Please let me know how to overcome this.
ThanksHi,
You can call a function using Callable Statement as
public String checkprimarycontact(String pri_loc_id,String org_id,String party_id)
int p_location_id = 0;
int p_org_id = 0;
int p_party_id = 0;
p_location_id = Integer.parseInt(pri_loc_id);
p_org_id = Integer.parseInt(org_id);
p_party_id = Integer.parseInt(party_id);
String priflag = "";
try
Connection conn1 = getOADBTransaction().getJdbcConnection();
CallableStatement cstmt1 = conn1.prepareCall("{? = call GET_PRIMARY_FUNCTION(?,?,?)}");
cstmt1.registerOutParameter(1,Types.VARCHAR);
cstmt1.setInt(2,p_location_id);
cstmt1.setInt(3,p_org_id);
cstmt1.setInt(4,p_party_id);
cstmt1.execute();
priflag = cstmt1.getString(1);
catch(Exception e1)
e1.printStackTrace();
return priflag;
Thanks,
Gaurav -
Return records from Stored Procedure to Callable Statement
Hi All,
I am createing a web application to display a students score card.
I have written a stored procedure in oracle that accepts the student roll number as input and returns a set of records as output containing the students scoring back to the JSP page where it has to be put into a table format.
how do i register the output type of "records" from the stored function in oracle in the "registerOutParameter" method of the "callable" statement in the JSP page.
if not by this way is there any method using which a "stored function/procedure" returning "record(s)" to the jsp page called using "callable" statement be retrieved to be used in the page. let me know any method other that writing a query for the database in the JSP page itself.I have a question for you:
If the stored procedure is doing nothing more than generating a set of results why are you even using one?
You could create a view or write a simple query like you mentioned.
If you're intent on going the stored procedure route, then I have a suggestion. Part of the JDBC 2.0 spec allows you to basically return an object from a CallableStatement. Its a little involved but can be done. An article that I ran across a while back really helped me to figure out how to do this. There URL to it is as follows:
http://www.fawcette.com/archives/premier/mgznarch/javapro/2000/03mar00/bs0003/bs0003.asp
Pay close attention to the last section of the article: Persistence of Structured Types.
Here's some important snippets of code:
String UDT_NAME = "SCHEMA_NAME.PRODUCT_TYPE_OBJ";
cstmt.setLong(1, value1);
cstmt.setLong(2, value2);
cstmt.setLong(3, value3);
// By updating the type map in the connection object
// the Driver will be able to convert the array being returned
// into an array of LikeProductsInfo[] objects.
java.util.Map map = cstmt.getConnection().getTypeMap();
map.put(UDT_NAME, ProductTypeObject.class);
super.cstmt.registerOutParameter(4, java.sql.Types.STRUCT, UDT_NAME);
* This is the class that is being mapped to the oracle object.
* There are two methods in the SQLData interface.
public class ProductTypeObject implements java.sql.SQLData, java.io.Serializable
* Implementation of method declared in the SQLData interface. This method
* is called by the JDBC driver when mapping the UDT, SCHEMA_NAME.Product_Type_Obj,
* to this class.
* The object being returned contains a slew of objects defined as tables,
* these are retrieved as java.sql.Array objects.
public void readSQL(SQLInput stream, String typeName) throws SQLException
String[] value1 = (String[])stream.readArray().getArray();
String[] value2 = (String[])stream.readArray().getArray();
public void writeSQL(SQLOutput stream) throws SQLException
}You'll also need to create Oracles Object. The specification for mine follows:
TYPE Detail_Type IS TABLE OF VARCHAR2(1024);
TYPE Product_Type_Obj AS OBJECT (
value1 Detail_Type,
value2 Detail_Type,
value3 Detail_Type,
value4 Detail_Type,
value5 Detail_Type,
value6 Detail_Type,
value7 Detail_Type,
value8 Detail_Type);Hope this helps,
Zac -
High memory usage on JDBC 10.2.0.1.0 driver on Prepared/Callable Statements
We are observing high memory usage for each callable/prepared stmt, using 10.2.0.1.0 JDBC Driver. The char[] in oracle/jdbc/driver/T4CVarcharAccessor was alloted 64K to 320K and grows with usage. This problem is worse with 10.1.0.2. driver which was alloted 720K byte of memory for each stmt right at the start.
We found this by doing a JVM heap dump and analyzing the heap dump using IBM's heap analyser. Here is a snapshot of the heap dump for this object:
321,240 [216] 11 oracle/jdbc/driver/T4CVarcharAccessor 0x72752968
- 320,616 [320,616] 0 char[] 0x72761028
- 216 [216] 0 short[] 0x727527d8
- 72 [32] 1 java/lang/String 0x727530a0
- 24 [24] 0 int[] 0x72752938
- 24 [24] 0 int[] 0x72752948
- 24 [24] 0 int[] 0x72752958
- 16 [16] 0 bool[] 0x72752928
- 16 [16] 0 byte[] 0x727528b0
- 16 [16] 0 bool[] 0x72752918
- 10,336 [88] 15 oracle/jdbc/driver/T4CMAREngine 0x712e7128
- 1,544 [1,032] 79 oracle/jdbc/driver/T4CPreparedStatement 0x72754c58
It is repeated many times for each prepared/callable stmt call.
Details of our platform is:
Database - Oracle Database 10g Release 10.2.0.1.0 - 64bit Production
JDBC Driver - Oracle Database 10g Release 2 (10.2.0.1.0) JDBC Drivers
JDK - [Classic VM, Version 1.4.2] from [IBM Corporation]
Our callable stmts are not using any of the Oracle caching facility. It is a simple call stmt with OUT parameters and the stmt is closed after each execution. However, we implement our own connection pooling and do not close the connection after each stmt.
Is there a workaround to this? Would appreciate any feedback.What is happening is that each new CallableStatement you create allocates a new char[]. I would strongly encourage you to use the implicit statement cache if at all possible. That way instead of creating a new statement each time with a new char[] you will get an already existing statement and reuse the existing char[]. Closing a statement releases the char[] so if you really are closing the statements the char[]s should be GC'd.
Douglas
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