How do you get values from 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.

How can you retrieve information from a ResultSet in Java?

Procedure

1. Invoke the Connection. createStatement method to create a Statement object.
2. Invoke the Statement.
3. In a loop, position the cursor using the next method, and retrieve data from each column of the current row of the ResultSet object using getXXX methods.
4. Invoke the ResultSet.
5. Invoke the Statement.

How do I print ResultSet data?

* * @param rs The ResultSet to print * @param maxStringColWidth Max. width of text columns */ public static void printResultSet(ResultSet rs, int maxStringColWidth) { try { if (rs == null) { System. err. println(“DBTablePrinter Error: Result set is null!”); return; } if (rs.

How do you create a ResultSet object in Java?

JDBC ResultSet and Generic Class List Using Java Reflection Annotations

1. Create a custom annotation.
2. Create a Model class, which contains mapping fields to the ResultSet column names with the created annotation.
3. Call the ResultSet.
4. Load the ResultSet for each value into the object.
5. Check for the Primitive type.

How do you set values in ResultSet?

Procedure

1. Call the ResultSet. moveToInsertRow method to create the row that you want to insert. The row is created in a buffer outside the ResultSet.
2. Call ResultSet. updateXXX methods to assign values to the row that you want to insert.
3. Call ResultSet. insertRow to insert the row into the ResultSet.

How do you read a ResultSet?

To read data using the ResultSet ‘s methods (eg. getString() , getInt() , getFloat() , etc) we can either use the column name or the column index of the field read in the SQL statement.

What is RS next () in Java?

The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row. The next() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the next row, from the current position. createStatement(); ResultSet rs = stmt.

What is ResultSetMetaData in Java?

ResultSetMetaData is an interface in java. sql package of JDBC API which is used to get the metadata about a ResultSet object. This object will have all the meta data about a ResultSet object like schema name, table name, number of columns, column name, datatype of a column etc.

What is a ResultSet in SQL?

The result set is an object that represents a set of data returned from a data source, usually as the result of a query. The result set contains rows and columns to hold the requested data elements, and it is navigated with a cursor.

What happens if you call the method close on a ResultSet object?

Closing a Statement object will close and invalidate any instances of ResultSet produced by that Statement object. The resources held by the ResultSet object may not be released until garbage collection runs again, so it is a good practice to explicitly close ResultSet objects when they are no longer needed.

What happens if you call deleteRow () on a ResultSet object?

What happens if you call deleteRow() on a ResultSet object? The row you are positioned on is deleted from the ResultSet, but not from the database.

Is ResultSet empty Java?

Hence, when a Java programmer needs to determine if ResultSet is empty or not, it just calls the next() method and if next() returns false it means ResultSet is empty.

How to read data from a resultset in Java?

Here is another example on how to read data from a ResultSet returned by executing an SQL query in database. We start by creating a connection to the database. Creates a PreparedStatement to execute a query to get some data from the books table. After executing the PreparedStatement we will have a ResultSet object.

How to get a result from a result set in Java?

This cursor is a pointer that points to one row of data in the ResultSet. Initially, the cursor is positioned before the first row. The method ResultSet.next moves the cursor to the next row. This method returns false if the cursor is positioned after the last row.

How do you get column values in 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.

How to print column names in resultset in Java?

1, 2 is the column number of table and set int or string as per data-type of coloumn For those who wanted more better version of the resultset printing as util class This was really helpful for printing resultset and does many things from a single util thanks to Hami Torun!