The given code defines two methods and primarily deals with...

The given code defines two methods and primarily deals with logging and querying a database. Here's what each part does:

dbg Method:

private void dbg(String msg) {
    ApplicationLog.getInstance().writeLog(this.userId, "EMSOutEJBBean." + msg);
}

This is a helper method used for logging debug messages. It:

1. Constructs a log message by combining the userId, a fixed prefix "EMSOutEJBBean.", and the message msg passed as an argument.
2. Passes this constructed message to an instance of ApplicationLog for writing into a log.

getModuleGroupID Method:

public String getModuleGroupID(String jndiName, String jobName) {

This method retrieves a specific MODULE_GROUP_ID based on the provided jobName from the database. Here's a breakdown of its functionality:

Core Steps in getModuleGroupID:

1. Preparation for Database Connection:

   • Define and initialize variables for connecting to the database, executing queries, and processing results:

   ResultSet rs = null;
   DataSource ds = null;
   Connection conn = null;
   PreparedStatement prdstmt = null;
   StringBuffer moduleGroupQryBuf = null;
   

   • Build the SQL query:

   String moduleGroupQry = "select MODULE_GROUP_ID from SMTB_MODULES_GROUP where MODULE_GROUP_ID = ?";
   moduleGroupQryBuf = new StringBuffer(moduleGroupQry);
   

2. Database Query Execution:

   • Retrieve a database connection using a DataSource obtained via FCServiceLocator:

   ds = FCServiceLocator.getInstance().getDataSource(jndiName);
   conn = ds.getConnection();
   prdstmt = conn.prepareStatement(moduleGroupQryBuf.toString());
   

   • Based on the jobName provided, determine which string to set as a parameter (MODULE_GROUP_ID) in the SQL query:
     • If jobName contains "EMS_OUT_PM": set the parameter to "FCPMTS".
     • If it contains "EMS_OUT_CL": set it to "FCCPLN".
     • If it contains "EMS_OUT_TR": set it to "OBTR".
     • If it contains "EMS_OUT_TF": set it to "OBTF".
     • For anything else, set it to "FCROFC".

3. Execute Query and Process Results:

   • Execute the SQL query:

     rs = prdstmt.executeQuery();
     

   • Extract the result if it exists:

     while (rs.next())
         moduleGroupID = rs.getString("MODULE_GROUP_ID");
     

   • This assigns the value of the column MODULE_GROUP_ID (if any row exists) to the variable moduleGroupID.

4. Error Handling:

   • Catch any SQL or general exceptions:
     • Log messages where an error occurs:

       dbg("SQLException :" + sqle.getMessage());
       dbg("getModuleGroupID-->SQLException = " + ex.getMessage());
       

     • Print stack traces and log the exceptions using the ApplicationLog object.

5. Clean Up:

   • Release all database resources (ResultSet, PreparedStatement, Connection) in the finally block to avoid resource leaks:

   if (rs != null) rs.close();
   if (prdstmt != null) prdstmt.close();
   if (conn != null && !conn.isClosed()) conn.close();
   

6. Return the Result:

   • Return the retrieved moduleGroupID (if found, else it remains null).

Summary:

• This code retrieves the MODULE_GROUP_ID from the database table SMTB_MODULES_GROUP based on the jobName.
• It dynamically determines the parameter value for the query based on the jobName string's content.
• It includes logging for debugging and error tracking.
• It ensures proper resource management by closing connections after use.