The JDBC standard states that the executeUpdate method returns a row count or 0. … For an SQL statement that can have an update count, such as an INSERT, UPDATE, DELETE, or MERGE statement, the returned value is the number of affected rows.
What is the return type of executeUpdate ()?
When the method executeUpdate is used to execute a DDL (data definition language) statement, such as in creating a table, it returns the int value of 0.
What is true about getConnection () method?
The getConnection(String url, Properties info) method of Java DriverManager class attempts to establish a connection to the database by using the given database url. The appropriate driver from the set of registered JDBC drivers is selected. Properties are implementation-defined as to which value will take precedence.
What is return type of Execute method?
Since this is a SELECT statement, the execute( ) method returns a boolean true to indicate that a result set is available. You can then call the Statement object’s getResultSet( ) method to retrieve the ResultSet object that contains the data from the database.What is the difference between executeQuery () and executeUpdate ()?
executeUpdate() : This method is used for execution of DML statement(INSERT, UPDATE and DELETE) which is return int value, count of the affected rows. executeQuery() : This method is used to retrieve data from database using SELECT query.
What is setString method in Java?
setString. void setString(int parameterIndex, String x) throws SQLException. Sets the designated parameter to the given Java String value. The driver converts this to an SQL VARCHAR or LONGVARCHAR value (depending on the argument’s size relative to the driver’s limits on VARCHAR values) when it sends it to the database …
What is executeUpdate in Java?
The executeUpdate( ) method works just like the execute( ) method, except that it returns an integer value that reports the number of rows affected by the SQL statement. … Then, the Statement object’s executeUpdate( ) method is called to execute the SQL DELETE statement, returning the number of rows affected into rslt .
What is the return type of the hashCode () method in the object class?
Explanation: In Java, the return type of hashCode() method is an integer, as it returns a hash code value for the object. Hence, the correct answer is the option (b).What is return type of execute () method in struts2?
Action. Struts 2 actions don’t force you to implement any interface or extends class, it’s only required you to implement an execute() method that returns a string to indicate which result page should return.
What is Execute () in Java?The execute() method of ThreadPoolExecutor class executes the given task sometime in the future. The task may execute in a new thread or an existing pooled thread. If the task is not submitted to the pool due to any reason, then the task is handled by the current RejectedExecutionHandler.
Article first time published onIs getConnection () method static?
In JDBC when you need to get a connection, you have to load a class Driver first. You do it via invocation of Class. forName . Then to get connection you have to invoke a static method getConnection .
Which exception is thrown by the getConnection () method of the DriverManager class?
Most of the JDBC API methods throw SQLException, so client programs must handle it properly. For example, using the DriverManager. getConnection() method, if the database URL is invalid, then that method will throw an exception of type SQLException.
How does DriverManager getConnection work?
getConnection. Attempts to establish a connection to the given database URL. The DriverManager attempts to select an appropriate driver from the set of registered JDBC drivers.
What type of value is returned by the executeQuery () method of Statement interface?
executeQuery(): This method is used to execute statements that returns tabular data (example select). It returns an object of the class ResultSet.
What is the return type of next () method in ResultSet?
Return value This method returns a boolean value specifying whether the ResultSet object contains more rows. If there are no rows next to its current position this method returns false, else it returns true.
What are different type of three Execute methods?
Different execute methods of ADO.NET command object are Execute Scalar() , Execute reader() , ExecuteNonQuery(). ExecuteScalar() fetches only a single object. ExecuteReader() fetches result set with multiple rows and loads to datareader. ExecuteNonquery() executes sql statements for insert,update and delete.
What is the return type of the method executeQuery string SQL?
ResultSet executeQuery(String SQL): Returns a ResultSet object.
Which method returns the number of rows affected in the table?
Get the Number of Rows Affected Using the execute() Method The execute() method executes the given SQL query, which may return multiple results.
What is executeUpdate in hibernate?
public int executeUpdate() – Execute the update or delete statement. public String getNamedParameters() – It return the names of all named parameters of the query. public String[] getQueryString() – Get the query string. public List list() – It return the query results as a List.
Which type of objects data types can be returned by PreparedStatement and CallableStatement?
All of the Statement object’s methods for interacting with the database (a) execute(), (b) executeQuery(), and (c) executeUpdate() also work with the PreparedStatement object. However, the methods are modified to use SQL statements that can input the parameters.
Which one is used with PreparedStatement?
StatementPreparedStatementCallableStatementIt is used to execute normal SQL queries.It is used to execute parameterized or dynamic SQL queries.It is used to call the stored procedures.
Which object do you ask for DatabaseMetaData?
You obtain the DatabaseMetaData object from a Connection , like this: DatabaseMetaData databaseMetaData = connection. getMetaData(); Once you have obtained this DatabaseMetaData instance, you can call methods on it to obtain the meta data about the database.
What is strut action mapping?
An action mapping is a configuration file entry that usually contains a reference to an Action class. This entry can contain a reference to a form bean that the action can use, and can also define local forwards and exceptions that are visible only to this action.
What is action name Struts2?
The action tag allows the programmers to execute an action from the view page. They can achieve this by specifying the action name. They can set the “executeResult” parameter to “true” to render the result directly in the view.
What is Struts XML?
xml File. The struts. xml file contains the configuration information that you will be modifying as actions are developed. This file can be used to override default settings for an application, for example struts. devMode = false and other settings which are defined in property file.
What is the return type of constructors?
Therefore, the return type of a constructor in Java and JVM is void.
What are methods in object class Java?
MethodDescriptionprotected Object clone() throws CloneNotSupportedExceptioncreates and returns the exact copy (clone) of this object.public String toString()returns the string representation of this object.public final void notify()wakes up single thread, waiting on this object’s monitor.
What is hashCode and equals in Java?
A hashcode is an integer value associated with every object in Java, facilitating the hashing in hash tables. … The hashcode() method returns the same hash value when called on two objects, which are equal according to the equals() method. And if the objects are unequal, it usually returns different hash values.
What is difference between submit () and execute () in Java?
The difference is that execute simply starts the task without any further ado, whereas submit returns a Future object to manage the task. You can do the following things with the Future object: Wait for the task to finish executing, with get .
What the class forName () does Mcq?
Explanation: forName(String className) returns the Class object associated with the class or interface with the given string name.
What is the return value of execute () in statement interface which is used to execute any SQL statement?
The “execute” method executes a SQL statement and indicates the form of the first result. You can then use getResultSet or getUpdateCount to retrieve the result, and getMoreResults to move to any subsequent result(s). getResultSet returns the current result as a ResultSet.
