- Does a stored procedure have to have input parameters?
- What is the meaning of ResultSet Type_scroll_insensitive?
- How do I make a ResultSet scrollable?
- Are ResultSet updatable?
- What is the correct order to close database resources?
- How do I move my cursor to the first row in ResultSet?
- What is the purpose of ResultSet object?
- Which method moves the cursor to the next row in the ResultSet object?
- Which method is used to execute a SQL Select statement and return a result?
- How can you retrieve information from a ResultSet?
- What is RS next () in Java?
- What is ResultSet Concur_updatable?
- Can ResultSet be null in Java?
- How do you pass dynamic parameters in SQL query?
- What is the return type of execute () method?
- Can we return ResultSet in Java?
- What happens if you call deleteRow () on a ResultSet object?
- How do you execute a procedure?
- What is the function of RS next () in a result set called RS?
- How do you check if a ResultSet is empty?
- What does executeQuery return in Java?
Does a stored procedure have to have input parameters?
Almost everything that is true for procedures, holds for functions as well.
The main difference between these objects is that function has a return value, and procedure has not.
A stored procedures and functions may have input, output, and input/output parameters..
What is the meaning of ResultSet Type_scroll_insensitive?
TYPE_SCROLL_INSENSITIVE means that the ResultSet can be navigated (scrolled) both forward and backwards. You can also jump to a position relative to the current position, or jump to an absolute position. The ResultSet is insensitive to changes in the underlying data source while the ResultSet is open.
How do I make a ResultSet scrollable?
Scrollable ResultSet exampleLoad the JDBC driver, using the forName(String className) API method of the Class. … Create a Connection to the database. … Create a Statement, using the createStatement() API method of the Connection. … Execute the query to the database, using the executeQuery(String sql) API method.More items…•
Are ResultSet updatable?
By default, a ResultSet object is not scrollable / updatable and its cursor moves forward only. To create a to create a scrollable result set object, you can use either the ResultSet. TYPE_SCROLL_INSENSITIVE or the ResultSet.
What is the correct order to close database resources?
If you want to explicitly close them in a row then you need to close them in the reverse order of creation: ResultSet, Statement, Connection. Also you need to wrap each close into try/catch, since they throw an exception as far as I remember.
How do I move my cursor to the first row in ResultSet?
You can move the cursor of the ResultSet object to the first row from the current position, using the first() method of the ResultSet interface. This method returns a boolean value specifying whether the cursor has been moved to the first row successfully.
What is the purpose of ResultSet object?
A ResultSet object maintains a cursor that points to the current row in the result set. The term “result set” refers to the row and column data contained in a ResultSet object. Navigational methods: Used to move the cursor around.
Which method moves the cursor to the next row in the ResultSet object?
You can move the cursor of the ResultSet object to the next row from the current position, using the next() method of the ResultSet interface. This method returns a boolean value specifying whether the ResultSet object contains more rows.
Which method is used to execute a SQL Select statement and return a result?
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.
How can you retrieve information from a ResultSet?
The ResultSet interface declares getter methods (for example, getBoolean and getLong ) for retrieving column values from the current row. You can retrieve values using either the index number of the column or the alias or name of the column. The column index is usually more efficient. Columns are numbered from 1.
What is RS next () in Java?
The next() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the next row, from the current position. Statement stmt = con. createStatement(); ResultSet rs = stmt. … And on calling the next() method for the second time the result set cursor will be moved to the 2nd row.
What is ResultSet Concur_updatable?
It is a constant of the ResultSet class representing the concurrency mode for a ResultSet object that may be updated. … In general, you will pass this as a value to the createStatement() method.
Can ResultSet be null in Java?
No, ResultSet returned by executeQuery(java. lang. String) method can never be null. Moreover, the standard way to check whether a ResultSet is empty or not is to try setting its cursor to first row by using its first() and if it returns false it indicates that ResultSet is empty.
How do you pass dynamic parameters in SQL query?
How to Pass Parameters in Dynamic T-SQL QueryPassing NULL. Pay an extra attention while passing variables with a NULL value. … Passing dates and times. The best format for passing dates is YYYYMMDD. … Passing strings. All string values are potentially dangerous code. … Lists of values in the IN clause. … Tricks of the trade.
What is the 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.
Can we return ResultSet in Java?
Return result sets from a Java method Ensure that the Java method is declared as public and static in a public class. For each result set you expect the method to return, ensure that the method has a parameter of type java. sql. ResultSet.
What happens if you call deleteRow () on a ResultSet object?
The deleteRow() method of the ResultSet interface deletes the current row from the ResultSet object and from the table.
How do you execute a procedure?
Expand the database that you want, expand Programmability, and then expand Stored Procedures. Right-click the user-defined stored procedure that you want and click Execute Stored Procedure. In the Execute Procedure dialog box, specify a value for each parameter and whether it should pass a null value.
What is the function of RS next () in a result set called RS?
next() checks if the result set contains any values or not. It returns a boolean value as well as it moves the cursor to the first value in the result set because initially it is at BEFORE FIRST Position. So if you want to access first value in result set, you need to write rs. next().
How do you check if a ResultSet is empty?
The JDBC ResultSet doesn’t provide any isEmpty(), length() or size() method to check if its empty or not. Hence, when a Java programmer needs to determine if ResultSet is empty or not, it just calls the next() method and if next() return false it means ResultSet is empty.
What does executeQuery return in Java?
executeQuery : Returns one ResultSet object. executeUpdate : Returns an integer representing the number of rows affected by the SQL statement. Use this method if you are using INSERT , DELETE , or UPDATE SQL statements.