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Programming Articles
Page 2497 of 2547
How to insert Date value into table in JDBC?
You can insert date values in SQL using the date datatype, The java.sql.Date class maps to the SQL DATE type.The PreparedStatement interface provides a method named setDate(). Using this you can insert date into a table. This method accepts two parameters −An integer representing the parameter index of the place holder (?) to which we need to set date value.a Date object representing the date value to be passed. The constructor of java.sql.Date class accepts a variable of long type representing the number of milliseconds from the epoch (standard base time I.e. January 1, 1970, 00:00:00 GMT).ExampleAssume we have created ...
Read MoreHow to retrieve Date from a table in JDBC?
The ResultSet interface provides a method named getDate() this method accepts an integer parameter representing the index of the column, (or, a String parameter representing the name of the column) from which you need to retrieve the date value. To retrieve date value from a table −Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.Connect to the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) as parameters to it.Create a Statement object using the createStatement() method of the Connection interface.Execute ...
Read MoreFetch the value from a LabelValue Tuple in Java
To fetch the value from a LabelValue class in Java, you need to use the getValue() method. To get the key, use the getLabel() method. Let us first see what we need to work with JavaTuples. To work with LabelValue class in JavaTuples, you need to import the following package −import org.javatuples.LabelValue;Note − Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project -> Properties -> Java Build Path -> Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples −Steps ...
Read MoreWhat is the use of Cookie or hidden fields in JSP?
CookiesA webserver can assign a unique session ID as a cookie to each web client and for subsequent requests from the client they can be recognized using the received cookie.This may not be an effective way as the browser at times does not support a cookie. It is not recommended to use this procedure to maintain the sessions.Hidden Form FieldsA web server can send a hidden HTML form field along with a unique session ID as follows −This entry means that, when the form is submitted, the specified name and value are automatically included in the GET or the POST ...
Read MoreFetch the value from Decade Tuple in Java
To fetch the value from Decade Tuple in Java, use the getAtX() method. Here, X represents the index value like getAt1() at index 1. This will return the element at index 1 in the Tuple.Let us first see what we need to work with JavaTuples. To work with Decade class in JavaTuples, you need to import the following packageimport org.javatuples.Decade;Note Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project -> Properties -> Java Build Path -> Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for ...
Read MoreHow can we maintain session between Web Client and Web Server?
Following are the few options to maintain the session between the Web Client and the Web Server −CookiesA webserver can assign a unique session ID as a cookie to each web client and for subsequent requests from the client they can be recognized using the received cookie.This may not be an effective way as the browser at times does not support a cookie. It is not recommended to use this procedure to maintain the sessions.Hidden Form FieldsA web server can send a hidden HTML form field along with a unique session ID as follows −This entry means that, when the ...
Read MoreSet Decade value in JavaTuples
To set a new value in the Decade Tuple, you need to use the setAtX() method. Here, X is the index wherein you want to set the value. For example, setAt2() sets the value at index 2. The value to be included is to be set as the value in the parameter, likesetAt2(“Amit”);Let us first see what we need to work with JavaTuples. To work with Decade class in JavaTuples, you need to import the following packageimport org.javatuples.Decade;Note Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project -> Properties -> Java ...
Read MoreOperators that cannot be overloaded in C++
In C++ we can overload some operators like +, -, [], -> etc. But we cannot overload any operators in it. Some of the operators cannot be overloaded. These operators are like below? “.” Member access or dot operator? “? : ” Ternary or conditional operator? “::” Scope resolution operator? “.*” Pointer to member operator? “sizeof” The object size operator? “typeid” Object type operatorThese operators cannot be overloaded because if we overload them it will make serious programming issues.For an example the sizeof operator returns the size of the object or datatype as an operand. This is evaluated by the ...
Read MoreWhat methods of session object is used frequently in JSP and for what purpose?
Here is a summary of important methods available through the session object −Sr.No.Method & Description1public Object getAttribute(String name)This method returns the object bound with the specified name in this session, or null if no object is bound under the name.2public Enumeration getAttributeNames()This method returns an Enumeration of String objects containing the names of all the objects bound to this session.3public long getCreationTime()This method returns the time when this session was created, measured in milliseconds since midnight January 1, 1970 GMT.4public String getId()This method returns a string containing the unique identifier assigned to this session.5public long getLastAccessedTime()This method returns the last ...
Read MorePlease share a working example of session maintenance in JSP.
This example describes how to use the HttpSession object to find out the creation time and the last-accessed time for a session. We would associate a new session with the request if one does not already exist. Session Tracking Session Tracking Session info Value ...
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