create barcode with vb.net The ResultSet Object in Java

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The ResultSet Object
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The executeQuery() method sends the SQL query to the DBMS for processing and returns a ResultSet object that contains data returned by the DBMS You use the methods defined in the ResultSet object to copy data returned by the DBMS to a Java collection or variable(s) for further processing Data returned by the DBMS is stored in a resultset Think of a resultset as a virtual table that consists of rows and columns similar to a spreadsheet The resultset also
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CHAPTER 13 JDBC and Java Data Objects
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contains metadata, which is information that describes data, such as the name of a column and its size and data type You move through the resultset by using a virtual pointer to point to each row in the table You move the virtual pointer by using methods defined in the ResultSet object Once you point to a row, you can then use other methods of the ResultSet object to retrieve values stored in each column of that row The virtual cursor is positioned above the first row when the DBMS returns the resultset This means that you must move the virtual cursor to the first row in order to access data returned by the DBMS The next() method is used to move the virtual cursor down a row If there is a next row, the next() method returns true; otherwise, a false is returned, indicating that you have reached the end of the resultset Use the getXXX() method to copy data from a column of the current row to an element of a Java collection or a variable Previously in this chapter, you learned about the getXXX() method The XXX is a placeholder for the data type of the column For example, the getString() method copies value of a String column from the resultset to a Java collection or a variable You must make sure that the data type used in the getXXX() method corresponds to the data of the column The getXXX() method requires one parameter an integer that represents the number of the column within the resultset whose value you want to copy to your program Columns appear in the order in which they are entered into the SQL query s SELECT statement Suppose your SQL query requested StudentFirstName and StudentLastName as the first two columns in the SELECT statement These would become the first and second columns of the resultset Therefore, to copy the value of the StudentFirstName column, you d type getString(1), and the getString() method would return the value of the StudentFirstName column of the current row The student s last name is copied by using getString(2) because the student s last name is in the second column returned by the DBMS
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Reading the Resultset
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The following example illustrates how to read values from the resultset into variables that can be further processed by your program You ll notice that many of the statements used in this example were used in previous examples, so you probably know what to tell Java to do Feel free to return to previous sections of this chapter to review any statements that seem unfamiliar to you
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String url = "jdbc:odbc:Registration"; String userID = "jim"; String password = "keogh";
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String printRow; String firstName; String lastName; Statement dataRequest; ResultSet results; Connection dB; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); dB = DriverManagergetConnection(url,userID,password); } catch (ClassNotFoundException e) { Systemerrprintln( "Unable to load the JDBC/ODBC bridge" + e); Systemexit(1); } catch (SQLException e) { Systemerrprintln( "Cannot connect to the database" + e); Systemexit(2); } try { String query = "SELECT FirstName,LastName FROM Students"; dataRequest = dBcreateStatement(); results = dataRequestexecuteQuery (query); } catch ( SQLException e ){ Systemerrprintln("SQL error" + e); Systemexit(3); } boolean records = resultsnext(); if (!records ) { Systemoutprintln("No data returned"); Systemexit(4); } try { do { firstName = resultsgetString ( 1 ) ; lastName = resultsgetString ( 2 ) ; printRow = firstName + " " + lastName; Systemoutprintln(printRow); } while (resultsnext() ); dataRequestclose(); }
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