var arr = [1,2,3,4];
Method 1:
var total = 0;
$.each(arr,function() {
total += this;
});
Method 2:
var sum = eval(arr.join('+'));
Method 3:
var i = arrMaxInvst.length; var sum = 0; while (--i) sum += arrMaxInvst[i];
javascript min max array values
var arr = new Array();
arr[0] = 100;
arr[1] = 0;
arr[2] = 50;
Array.prototype.max = function() {
return Math.max.apply(null, this)
}
Array.prototype.min = function() {
return Math.min.apply(null, this)
}
var min = Math.min.apply(null, arr),
max = Math.max.apply(null, arr);
To find the Maximum value in Array Use Below
var max_of_array = Math.max.apply(Math, array);
Query for website site counter based on month
CREATE TABLE ipaddress(id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
date VARCHAR(255),
ip VARCHAR(255));
INSERT INTO ipaddress(date, ip)
VALUES('1-1-2012', '195.165.1.2'),
('1-1-2012', '195.165.1.3'),
('12-2-2012', '195.165.1.8');
Total number of Visits should be grouped based on IP Address
SELECT COUNT(ip), MONTHNAME(STR_TO_DATE(date, '%c-%e-%Y')) as period FROM ipaddress GROUP BY period;
Updatating Database through bean
package com.javadb2.mugil.employee;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.javadb2.mugil.db.display;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
public class update
{
public static void main(String args[])
{
bean objBean = new bean();
objBean.setEmpId(Integer.parseInt(getInput("Enter Employee Id :")));
objBean.setEmpName((String)getInput("Enter Employee Name:"));
objBean.setEmpSalary(Integer.parseInt(getInput("Salary")));
updateValues(objBean);
}
public static void updateValues(bean objBean)
{
System.out.println(objBean.getEmpName());
System.out.println(objBean.getEmpSalary());
String strSQL = "UPDATE employeelist" +
" SET empname = ? ," +
" salary = ?" +
" WHERE empid = ?";
try
{
Connection conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "pass");
PreparedStatement stmt = (PreparedStatement) conn.prepareStatement(strSQL);
stmt.setString(1, objBean.getEmpName());
stmt.setDouble(2, objBean.getEmpSalary());
stmt.setInt(3, objBean.getEmpId());
int affected = stmt.executeUpdate();
if(affected == 1)
{
System.out.println("Updated Successfully");
}
else
{
System.err.println("Unable to Update Employee");
}
}
catch (SQLException e)
{
e.printStackTrace();
}
}
public static String getInput(String prompt)
{
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
System.out.print(prompt);
System.out.flush();
try
{
return stdin.readLine();
}
catch (Exception e)
{
// TODO: handle exception
return e.getMessage();
}
}
}
How to create Java bean and use for CRUD Operation
Database Table
CREATE TABLE employeeList(empid int not null primary key auto_increment,
empname varchar(255),
salary double);
Bean Class
package com.javadb2.mugil.employee;
public class bean
{
private int empId;
private String empName;
private double empSalary;
public int getEmpId()
{
return empId;
}
public void setEmpId(int empId)
{
this.empId = empId;
}
public String getEmpName()
{
return empName;
}
public void setEmpName(String empName)
{
this.empName = empName;
}
public double getEmpSalary()
{
return empSalary;
}
public void setEmpSalary(double empSalary)
{
this.empSalary = empSalary;
}
}
Crud Operation with Bean Class
package com.javadb2.mugil.employee;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.javadb2.mugil.db.display;
import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.Statement;
public class insert
{
public static void main(String[] args)
{
bean objBean = new bean();
objBean.setEmpName(display.getInput("Enter the Employee Name"));
objBean.setEmpSalary(Integer.parseInt(display.getInput("Enter Salary")));
boolean result = getInsertedKey(objBean);
if(result)
{
System.out.println("The Last Inserted Primary Key is "+objBean.getEmpId());
}
}
public static boolean getInsertedKey(bean objBean)
{
ResultSet keys = null;
String strSQL = "INSERT INTO employeeList(empname, salary)VALUES(?,?)";
try
{
Connection conn = getConnection();
PreparedStatement stmt = (PreparedStatement) conn.prepareStatement(strSQL, Statement.RETURN_GENERATED_KEYS);
stmt.setString(1, objBean.getEmpName());
stmt.setDouble(2, objBean.getEmpSalary());
int affected = stmt.executeUpdate();
if(affected == 1)
{
keys = stmt.getGeneratedKeys();
keys.next();
int newkey = keys.getInt(1);
objBean.setEmpId(newkey);
}
else
{
System.err.println("Unable to Update Values");
return false;
}
}
catch (SQLException e)
{
processException(e);
System.err.println("Error in Establishing Connection");
}
return true;
}
public static Connection getConnection() throws SQLException
{
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "pass");
return conn;
}
public static void processException(SQLException e)
{
System.err.println("Error Message "+e.getMessage());
System.err.println("Error Code"+e.getErrorCode());
System.err.println("SQL State"+e.getSQLState());
}
}
Executing a Select statement in Java
public class JAVADB2
{
public static void main(String args[]) throws SQLException
{
try
{
Connection conn = null;
ResultSet rs = null;
Statement stmt = null;
String strSQL = "SELECT * FROM employee";
conn = incDB.getConnection();
stmt = (Statement)conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.FETCH_FORWARD);
rs = stmt.executeQuery(strSQL);
display.getRecords(rs);
}
catch (SQLException e)
{
incDB.getException(e);
}
}
}
Utility Methods
public class incDB
{
private static String USER_NAME = "root";
private static String USER_PASS = "pass";
private static String CONN_STRING = "jdbc:mysql://localhost/test";
public static Connection getConnection() throws SQLException
{
return DriverManager.getConnection(CONN_STRING, USER_NAME, USER_PASS);
}
public static void getException(SQLException e)
{
System.out.println("Message :"+e.getMessage());
System.out.println("Error Code :"+e.getErrorCode());
System.out.println("State : "+e.getSQLState());
}
}
public class incDB
{
private static String USER_NAME = "root";
private static String USER_PASS = "";
private static String CONN_STRING = "jdbc:mysql://localhost/test";
public static Connection getConnection() throws SQLException
{
return DriverManager.getConnection(CONN_STRING, USER_NAME, USER_PASS);
}
public static void getException(SQLException e)
{
System.out.println("Message :"+e.getMessage());
System.out.println("Error Code :"+e.getErrorCode());
System.out.println("State : "+e.getSQLState());
}
}
Stored procedure which returns records from select statement
Stored Procedure
DROP PROCEDURE IF EXISTS getEmpDetail;
CREATE PROCEDURE getEmpDetail(IN Salary INT)
BEGIN
SELECT empid, empname, sal
FROM employee
WHERE sal < Salary;
END;
Java Code
public static void main(String args[]) throws SQLException
{
try
{
Connection conn = null;
ResultSet rs = null;
Integer salary = Integer.parseInt(display.getInput("Enter the Salary Amount"));
String strSQL = "{CALL getEmpDetail(?)}";
conn = incDB.getConnection();
PreparedStatement stmt = (PreparedStatement) conn.prepareStatement(strSQL, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.FETCH_FORWARD);
stmt.setInt(1, salary);
rs = stmt.executeQuery();
display.getRecords(rs);
}
catch (SQLException e)
{
incDB.getException(e);
}
}
Utility Function
public class incDB
{
private static String USER_NAME = "root";
private static String USER_PASS = "pass";
private static String CONN_STRING = "jdbc:mysql://localhost/test";
public static Connection getConnection() throws SQLException
{
return DriverManager.getConnection(CONN_STRING, USER_NAME, USER_PASS);
}
public static void getException(SQLException e)
{
System.out.println("Message :"+e.getMessage());
System.out.println("Error Code :"+e.getErrorCode());
System.out.println("State : "+e.getSQLState());
}
}
public static void getRecords(ResultSet rs) throws SQLException
{
while(rs.next())
{
StringBuffer buffer = new StringBuffer();
buffer.append("Emp Id :"+ rs.getString("empid")+ " Emp Name :"+rs.getString("empname"));
System.out.println(buffer.toString());
}
if(rs.isBeforeFirst())
System.out.println("Finished Printing");
}
public static String getInput(String prompt)
{
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
System.out.print(prompt);
System.out.flush();
try
{
return stdin.readLine();
}
catch (Exception e)
{
return "Error :"+e.getMessage();
}
}
How to Get values from MySQL Stored Procedure in Java that returns more than one resultset
Stored Procedure
DROP PROCEDURE IF EXISTS getEmpDetails;
CREATE PROCEDURE getEmpDetails(IN Salary INT, OUT total INT)
BEGIN
SELECT count(*) into total
FROM employee
WHERE sal < Salary;
SELECT empid, empname, sal
FROM employee
WHERE sal < Salary;
END;
Java Code
public static void main(String args[]) throws SQLException
{
try
{
Connection conn = null;
ResultSet rs = null;
Integer salary = Integer.parseInt(display.getInput("Enter the Salary Amount"));
String strSQL = "{CALL getEmpDetails(?, ?)}";
conn = incDB.getConnection();
java.sql.CallableStatement stmt = conn.prepareCall(strSQL, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.FETCH_FORWARD);
stmt.setInt(1, salary);
stmt.registerOutParameter("total", Types.INTEGER);
rs = stmt.executeQuery();
int nRows = stmt.getInt("total");
System.out.println("Total no of Records :"+nRows);
display.getRecords(rs);
}
catch (SQLException e)
{
incDB.getException(e);
}
}
Utility Functions
public static void getRecords(ResultSet rs) throws SQLException
{
while(rs.next())
{
StringBuffer buffer = new StringBuffer();
buffer.append("Emp Id :"+ rs.getString("empid")+ " Emp Name :"+rs.getString("empname"));
System.out.println(buffer.toString());
}
if(rs.isBeforeFirst())
System.out.println("Finished Printing");
}
Query2
The first Location from second table should be added to the first table Location.
CREATE TABLE projectlist(ProjectId INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
ProjectName VARCHAR(50),
Location VARCHAR(50));
CREATE TABLE LocationList(LocaId INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
ProjectId INT,
Location VARCHAR(50));
INSERT INTO projectlist(ProjectName)
VALUES('Project A'),
('Project B'),
('Project C'),
('Project D'),
('Project E'),
('Project F'),
('Project G'),
('Project H');
INSERT INTO LocationList(ProjectId, Location)
VALUES(1, 'Location A'),
(1, 'Location C'),
(3, 'Location B'),
(4, 'Location C'),
(5, 'Location D'),
(2, 'Location C'),
(2, 'Location B'),
(2, 'Location A'),
(6, 'Location A'),
(6, 'Location B'),
(7, 'Location B'),
(8, 'Location D'),
(8, 'Location A');
UPDATE projectlist JOIN (SELECT LocationList.ProjectID,
LocationList.Location
FROM LocationList
JOIN (SELECT LocationList.ProjectID,
min(LocaId) minLocaId
FROM LocationList
GROUP BY LocationList.ProjectID) l1
ON LocationList.LocaId = l1.minLocaID) l2 ON projectList.ProjectID = l2.ProjectID
SET ProjectList.Location = l2.Location;
Jquery Dropdown Population after ajax Request
url = "/property/realestate_statistics/";
lngCityId = $('#cboCityName').val();
$.post(
url,
{
"act" : "GetCommonLocation",
"CityId" : lngCityId
},
function(responseText){
$('#cboLocation').html(responseText);
$('#cboPropertyType').html('');
$('#cboPropertyType').append( new Option('Property Type',''));
$('#cboPropertyType').val('Property Type');
},
"html"
);
I have a response text coming after changing city and this will be populated in second drop down
cboLocation. Now the third drop down should be repopulated based on property type at city by taking common location selected in to consideration. for that you should reset property type apart from resetting cboLocation.
To do so
$('#cboPropertyType').html('');
$('#cboPropertyType').append( new Option('Property Type',''));
$('#cboPropertyType').val('Property Type');
- $(‘#cboPropertyType’).html(”) – To empty the Content of Drop down
- $(‘#cboPropertyType’).append( new Option(‘Property Type’,”)) – It should Contain only Property Type in Option so i am Appending that
- $(‘#cboPropertyType’).val(‘Property Type’) – It should point to only one option that exixts