JDBC :: Maximum Number Of Connections
Feb 29, 2012
I am using a static initialization block to register the driver and a static synchronized method to get a connection. The problem is I need to run 15 threads but always only two threads get the connection. I want to know if there is a default maximum number of concurrent connections a DriverManager can provide or is it my threading logic that may be faulty.
CODE:
static {
try {
Class jdbcDriverClass = Class.forName( JDBC_DRIVER );
driver = (Driver) jdbcDriverClass.newInstance();
DriverManager.registerDriver( driver );
[Code] ....
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Jun 19, 2015
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production0PL/SQL Release 12.1.0.2.0 - Production0CORE12.1.0.2.0Production0TNS for Linux: Version 12.1.0.2.0 - Production0NLSRTL Version 12.1.0.2.0 - Production0
Using JavaSE-1.7
Using ucp.jar,ons.jar and OJDBC7.jar
I set up the datasource as follows :
pds = PoolDataSourceFactory.getPoolDataSource();
pds.setConnectionFactoryClassName(factoryClassName);
pds.setMaxPoolSize(maxPoolSize); maxPoolSize 10
pds.setMinPoolSize(minPoolLimit); minPoolLimit 1
[Code] ....
In the class that actually uses it I create a method variable for the connection object.
Closing the connection as well as pds.getConnection().close();e
I am thinking that at the most I should have only one inactive connection showing up when I monitor the session. How do I configure the pool as to only show on inactive connection? I am running the test queries once every five minutes. But I am opening three connections each time.
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Mar 5, 2015
We are running a set of unit tests using the latest ojdbc 7 driver and the highest open cursor keeps going up, until it hits our 300 limit, then throws the cursor limit exception. If we run these tests using ojdbc 12.0.1.1, the highest open cursor stays at 17 and doesn't cause this exception.
The query used to monitor these cursors is below:
SELECT max(a.value) as highest_open_cur, p.value as max_open_cur FROM v$sesstat a, v$statname b, v$parameter p WHERE a.statistic# = b.statistic# and b.name = 'opened cursors current' and p.name= 'open_cursors' group by p.value
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
Java 8 version 31
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Dec 3, 2014
What is the difference between instansiating a ServerSocket and .accept(); and a ServerSocketChannel .accept();
They both listen on a port for incoming connections so what is the benifit or dissadvantage of ServerSocketChannel?
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May 17, 2014
calling a parameterized stored procedure in java jdbc from sql server.The stored procedure goes like this in sql
create proc patientreg
@id int
as
begin
select [patient_id],[Psurname], [pFirstname], [pMiddlename], [reg_date], [DOB], [Sex], [Phone_num], [Addr],[Email],[dbo].[fncomputeage](DOB) from [dbo].[Patient_registration] where [patient_id] = @id
end
please note dbo.fncompute(DOB) is a function
To call it in jdbc it goes like this
try{
String str = "{call patientreg(?)}";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbcdbc:GeneralHospit al");
cstmt = con.prepareCall(str);
cstmt.setInt(1, Integer.parseInt(t.getText()));
[code]....
after doing it this way it throwing an exception: Error:java.sql.SQLException: Parameter 1 is not an OUTPUT parameter.
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Apr 23, 2014
I am just not sure of some theory in collections, ArrayList and LinkedList maximum capacity depends on the memory allocated to the JVM. But according to few people those list has a maximum capacity of Integer.MAX_VALUE.
According to my experiment, those list has a maximum capacity of Integer.MAX_VALUE since the get method of List accept a parameter of int primitive type (index of element), therefore we can conclude that the maximum capacity of List is equal to Integer.MAX_VALUE.
But what about the Map? get() method of map accepts object(the key of the map). So does it mean that the maximum capacity of Map depends on the memory allocated to our JVM? Or its maximum size is Integer.MAX_VALUE also just like Lists and Arrays? Is there a way to prove it? Is Map designed to hold infinite number of data (disregarding the heap memory space exception)?
And also about Stack, Deque? is it also the same as Map (in terms of maximum capacity)?
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Nov 21, 2014
i need to calculate the minimum and the maximum, actually it seems to be easy but, the minimum should be the smallest number but 0..this is my code
Java Code:
Scanner s = new Scanner (System.in);
int max = 0 ;
int min = 0 ;
System.out.println(" Please enter 3-5 numbers");
int a = s.nextInt();
int b = s.nextInt();
int c = s.nextInt();
int d = s.nextInt();
int e = s.nextInt();
[code]....
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Feb 20, 2015
I am doing a homework assignment for a class I'm taking and writing a java program that finds the smallest and largest number in an array entered by the user. For some reason no matter what I enter as the smallest number it returns 0 as the smallest. I'm not sure what I have done wrong. Here is my code:
import javax.swing.JOptionPane;
public class MinimumAndMaximumJamesBulow
{
public static void main(String[] args)
{
int minimum = 0;
int maximum = 0;
[Code] ....
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Oct 6, 2014
I have a set of enum values (let's call then ONE, TWO, THREE.....). I want to find the larger of two of them. But max(ONE,THREE) gives a compile error as MAX isn't defined for type-safe enums. Fair enough.
I also agree that one shouldn't be able to use arithmetic functions on enums.
But as Enum implements Comparable, one can write a function which implements max and min, rather inefficiently I assume.
Is there a better way of getting the max/min of an enum? And if not, can the Java team be persuaded to implement it?
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Aug 23, 2014
Write a program to find maximum between three numbers using ternary operator.
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Oct 26, 2014
import java.io.IOException;
public class Largestcolumn
{
public static void main ( String[] args ) throws IOException
{
int largest = 0;
int newnumber = 0;
int[][] data = { {3, 2, 5},
[Code] ....
When I run this code, I get this following output: The largest element in column 0 is: 9.
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
at largestcolumn.Largestcolumn.main(Largestcolumn.java:27)
Java Result: 1
It outputs the first column's maximum element but then throws an out of bounds error. I'm new to Java and I can't figure out how to fix my code so that it will work for this multidimensional array and output the maximum elements in all of the columns.
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Oct 14, 2014
I have a requirement to find the greatest/maximum of the given list of Calendar objects in Java.
i.e., 2013/01/26
2014/03/03
2012/02/27
2014/01/15
So the above list of calendar objects are in Arraylist. I need to get the max/greatest among these. Eventually, the answer should be 2014/03/03
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Dec 11, 2014
I am trying to write a TreeMap that can hold a max of 20 colors and a minimum of 8. I have a while loop using pollLastEntry to limit the max but I can't figure out how to set the minimum. The hex number is the map's key and the color name is the value. I tried to use entrySet() and iterator to just double the size of the map but map can't have multiple keys with the same value. It also seems that to set a minimum would require some kind of further input(which I'm trying to avoid) of colors and their hex numbers.
//Method to hard code the colors into the map
public TreeMap<String, String> cm() {
//Color Map <Hex number, Color name>
//Uses a TreeMap to keep all the colors organized by key
TreeMap<String, String> cMap = new TreeMap<String, String>();
cMap.put("FFFF00", " Yellow");
[code]....
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Aug 12, 2014
If you aren't familiar with the euler problem 67, you are given an array that is a set of numbers in a triangle. Like this
3
7 4
2 4 6
8 5 9 3
and you have to find the maximum path, which for this one is
(3)
(7) 4
2 (4) 6
8 5 (9) 3
I have solved this problem iteratively with the code below
depth = depth-2;
while (depth >=0) {
for (int j = 0; j <= depth; j++) {
values[depth][j] += Math.max(values[depth+1][j], values[depth+1][j+1]);
}
depth -= 1;
}
depth is a variable for the row in the triangle. My problem is that i need the solution to be recursive and i am having trouble doing this. So far i have
public static int findMax(int[][] array,int depth) {
if (depth==0)
return array[0][0];
else if
}
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Feb 26, 2014
It does not calculate the maximum, minimum or average of the 10 numbers that the user is prompted to input.
My code:
import java.util.Scanner;
public class moretest {
public static void main( String [ ] args ) {
int total = 0;
int number;
int minGrade = 101;
[code]...
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Apr 22, 2015
a. Write a Java program to input 10 integer numbers into an array named fmax and determine the maximum value entered. Your program should contain only one loop, and the maximum should be determined as array element values are being input. (Hint: Set the maximum equal to the first array element, which should be input before the loop used to input the remaining array values.)
b. Repeat 1a, keeping track of both the maximum element in the array and the index number for the maximum. After displaying the numbers, display these two messages:
The maximum value is: _________
This is element number __________ in the list of numbers
Have your program display the correct values in place of the underlines in the messages.
c. Repeat 1b, but have your program locate the minimum value of the data entered.
I did parts a and b but for part see i just want to know if i did it correctly or not
import java.util.Scanner;
public class MinimumValueArray {
public static void main(String[] args) {
//Variable Declaration
Scanner keyboard = new Scanner(System.in);
int size = 10;
[Code] ,.....
When I run it i get this The minimum value is 0.0
The element that holds the value is 0 right away. is this right for the minimum or am i supposed to enter values and it will display the minimum value like in parts a and b wit the maximum? will the minimum just always be 0 or ?
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Apr 27, 2015
So I'm learning java from a website and I was tasked with creating a simple program which allows the user to enter a series of integers, then finally when they decide to input a non-integer the program will print the maximum and minimum values of the integers they entered. So for example if they entered 5, 4, 3 and 2 then enter a non-integer the program would output 5 (maximum value), then 2 on a new line (minimum value).
Here is my code:
import java.util.Scanner;
public class MaxMinPrinter {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
[Code] ....
And this is what the output looks like:
Actual output
-------------------------------------------
Enter an integer: 5
- 10
-
- Enter an integer: -4
- 8
- -6
-
- Enter an integer: 11
- -1
-
- Enter an integer: q
- -1
- -6
When it's supposed to look like this:
Expected output
-------------------------------------------
Enter an integer: 5
Enter an integer: 10
Enter an integer: -4
Enter an integer: 8
Enter an integer: -6
Enter an integer: 11
Enter an integer: -1
Enter an integer: q
11
-6
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Nov 25, 2014
So lets say I got maximum of 20 deposit, I want to create a method/function (idk what proper name for it is) so that you cannot deposit more than 20 nor withdraw more than you have in your account, so this function checks your account, if your total is for example 18 and you're trying to deposit 10, it rejects it and doesn't add to your total and pops up with a message, vice versa for withdraw.
This is what I have so far
Not I already have the maximum limit + total feature created just not displayed here
public void depositMoney (int dMoney) {
if(DMoney > 0 ) {
totalMoney = totalMoney + dMoney;
}
else {
System.out.println("Please insert money more than 0");
[Code] .....
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Oct 21, 2014
1. Create a program that will return the maximum and minimum numbers in the elements of ONE-dimensional integer array. Save it as MaxMin_OneDim.java
2. Create a program that will return the maximum and minimum numbers in the elements of each row in a TWO-dimensional integer array. Save it as MaxMin_TwoDim.java
3. Write a program PrintPattern which prompt a user to enter a number and prints the following patterns using nested loops (assumed user entered number is 8 output is:)
1 .... 87654321
12 .... 7654321
123 .... 654321
1234 .... 54321
12345 .... 4321
123456 .... 321
1234567 .... 21
12345678 .... 1
(Without the dots, i just put them to give spaces)
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Sep 27, 2013
I have been having difficulty with the weeks concepts in my online Java class, the program is to be as followed:
For this exercise you will implement a class called Pair, that represents a pair of two numbers.The Pair class should include the following constructor and methods:
CONSTRUCTORS
public Pair(double num1, double num2) -- Creates an object that represents a pair of double values
METHODS
public double getAverage() -- Returns the average value of the two numbers
public double getDistance() -- Returns the absolute vale of the distance between the two numbers
public double getMaximum() -- Returns the maximum value of the two numbers
public double getMinimum() -- Returns the minimum vale of the two numbers
Write a class called PairTest that tests your Pair implementation. The PairTest should prompt the user for the two values, create a Pair object with the values and then print the average, distance, maximum, and minimum of the pair. The input / output should look like the following:
Enter the first number: 5.5
Enter the second number: 3.0
Average: 4.25
Distance: 2.5
Maximum: 5.5
Minimum: 3.0
NOTE: For this exercise, your solution should not use any conditional statements. Instead you should use the methods provided by thejava.util.Math.
So far I have:
import java.lang.Math;
import java.util.Scanner;
public class Main
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
{
System.out.println("Please enter a value for the first number");
[Code] ....
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Nov 25, 2014
So lets say I got maximum of 20 deposit, I want to create a method/function (idk what proper name for it is) so that you cannot deposit more than 20 nor withdraw more than you have in your account, so this function checks your account, if your total is for example 18 and you're trying to deposit 10, it rejects it and doesn't add to your total and pops up with a message, vice versa for withdraw.
This is what I have so far . Not I already have the maximum limit + total feature created just not displayed here
Java Code:
public void depositMoney (int dMoney) {
if(DMoney > 0 ) {
totalMoney = totalMoney + dMoney;
} else {
System.out.println("Please insert money more than 0");
[Code] ....
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Apr 22, 2015
I am working on this rental program and got stuck in the last part. The program is about renting a car; after completing the rent process it displays the user who spent maximum and minimum rent. This is where I can't proceed. The program displays maximum values for both max and min. Here's the code I have written:
import java.util.Scanner; // program uses Scanner
public class CarRentalTest {
public static void main( String[] args )
{
System.out.println("Welcome to Rental Portal");
Scanner input = new Scanner( System.in ); // create Scanner to obtain input from command window
CarRental details=new CarRental();
[Code] ....
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Aug 7, 2014
public class StudentJDBCTemplate implements StudentDao
above class giving error as
The type StudentJDBCTemplate must implement the inherited abstract method
StudentDao.listStudents()
Interface is as below
import java.util.List;
import javax.sql.DataSource;
public interface StudentDao {
public void setDataSource(DataSource ds);
public void Create(String Name,Integer age);
public void getStudent(Integer id);
public List<Student>listStudents();
public void delete(Integer id);
public void update(Integer id,Integer age);
}
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Aug 9, 2014
I'm trying to understand the relationship between JAAS and JDBC..In WebSphere, when setting up a Dynamic cluster I have to first define the JAAS..Then, the datasource..The JAAS has one account/password and the datasource another..I'm not getting the relationship between needing both JAAS and JDBC docs.oracle.com/cd/E19225-01/820-5594/ahteo/index.html
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Nov 25, 2014
I wish to retrieve just one value from db;
so I use this code:
@Transactional
public long getSequenceSedeB(Long id) {
BigDecimal seqValue = nu
String sql = "SELECT MAX(ID) FROM SEDE_B_ALLEGATI_A WHERE ID_SEDE=:id";
SQLQuery query = getSession().createSQLQuery(sql);
[Code] ....
But it do not works; this is the log.
type.NullableType (NullableType.java:182) - could not read column value from result set: ID; Invalid column name
2014-11-25 14:45:14,476 WARN [btpool0-2] util.JDBCExceptionReporter (JDBCExceptionReporter.java:77) - SQL Error: 17006, SQLState: null
2014-11-25 14:45:14,478 ERROR [btpool0-2] util.JDBCExceptionReporter (JDBCExceptionReporter.java:78) - Invalid column name
But in the database the query
SELECT MAX(ID) FROM SEDE_B_ALLEGATI_A WHERE ID_SEDE=:id
run correctly;
Also I need to rewrite the statement
query.setParameter("id", 923);
in this way
query.setParameter("id", AAA);
where AAA is gotten from out of the procedure;
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Feb 26, 2015
I'm having problem with my code when it comes to Restore Database in Java. This is my code:
public boolean restoreDB(String dbUserName, String dbPassword, String source) {
String[] executeCmd = new String[]{"C:Program Files (x86)MySQLMySQL Server 5.1inmysqldump ", "--user=" + "root", "--password=" + "1234" + source};
Process runtimeProcess;
try {
runtimeProcess = Runtime.getRuntime().exec(executeCmd);
int processComplete = runtimeProcess.waitFor();
[Code] ....
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