如何将JRDataSource用于Jasper报告

Question

Previously I am sending the connection object to the fillReport() of JasperFillManager class. It is working fine and it is generating the data also. The below is the code I am using for database connection.

Connection conn = null; 
Class.forName("com.mysql.jdbc.Driver"); 
conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/dbname", "username", "password");

But now I don't want to pass the connection object to the fillReport() instead I want to pass the JRDataSource. How can I achieve this? How to configure this JRDataSource in my spring configuration file with mysql database information? Can any one please tell me.

I am using iReport 4.5.0 and Spring 3.0.5 RELEASE . If you want anymore information I will give you.

Answer 1

You can get the result set from database with the conn. Then you will use JRResultSetDataSource to instantiate a data source.

        Connection con = getConnection();
        PreparedStatement statement = con.prepareStatement(jdbcString.toString());
        ResultSet rs = statement.executeQuery();
        jrDataSource = new JRResultSetDataSource(rs);

Answer 2

JasperReport report 
   = (JasperReport)JRLoader.loadObject(
       "F:\\Tomcat 7.0\\webapps\\ivmreports\\jasper\\FailedInsertionEventsPDF.jasper");
// Map<String, Object> parameterMap = new HashMap<String, Object>();
JasperPrint print = JasperFillManager.fillReport(report, parameterMap, reportData);

Here reportdata is JRDatasource