Connection of the ADF application module
I use JDeveloper 11.1.1.6
I would like some advice of good practices on how to manage properly the connection module of the application.
Here is a code example. I want to know if she properly managed in terms of DB, statement and result set connection? No optimization?
CallableStatement stmt = null;
Connection Conn = null;
ResultSet rset = null;
String sql = "start Process_query(?,?); end; « ;
MyAppModuleImpl m = dc_bc.getDataControl () .getApplicationModule () (MyAppModuleImpl);
try {}
stmt = am.getDBTransaction () .createCallableStatement (_getAttributesStatement, 0);
Connection Conn = st.getConnection ();
ArrayDescriptor = attributeDescriptor
ArrayDescriptor.createDescriptor ("PARAMS_TAB", conn);
String [] [] attributes = / / initialize the table attributes;
AttributesArr = ARRAY
New ARRAY (attributeDescriptor, conn, attributes); oracle.sql.ARRAY
stmt.setArray (1, attributesArr);
stmt.registerOutParameter (2, java.sql.Types.VARCHAR);
ResultSet rset = stmt.executeQuery (sql);
do something here
} catch (Exception e) {}
_logger. Sever (e);
throw e;
} {Finally
try {}
If (conn! = null)
Conn.Close ();
} catch (SQLException sqle) {}
_logger. Warning (sqle);
}
try {}
If (stmt! = null)
stmt. Close();
} catch (SQLException sqle) {}
_logger. Warning (sqle);
}
try {}
If (rset! = null)
RSet.Close ();
} catch (SQLException sqle) {}
_logger. Warning (sqle);
}
}
UPDATE:
According to Timo, I reorganized the code as follows:
In MyAppModuleImpl I have a processQuery() method
public String processQuery (String [] [] attributes) {}
CallableStatement stmt = null;
Connection Conn = null;
ResultSet rset = null;
String sql = "start Process_query(?,?); end; « ;
try {}
stmt = getDBTransaction () .createCallableStatement (_getAttributesStatement, 0);
Connection Conn = st.getConnection ();
ArrayDescriptor = attributeDescriptor
ArrayDescriptor.createDescriptor ("PARAMS_TAB", conn);
AttributesArr = ARRAY
New ARRAY (attributeDescriptor, conn, attributes); oracle.sql.ARRAY
stmt.setArray (1, attributesArr);
stmt.registerOutParameter (2, java.sql.Types.VARCHAR);
ResultSet rset = stmt.executeQuery (sql);
do something here
} catch (Exception e) {}
_logger. Sever (e);
throw e;
} {Finally
try {}
If (conn! = null)
Conn.Close ();
} catch (SQLException sqle) {}
_logger. Warning (sqle);
}
try {}
If (stmt! = null)
stmt. Close();
} catch (SQLException sqle) {}
_logger. Warning (sqle);
}
try {}
If (rset! = null)
RSet.Close ();
} catch (SQLException sqle) {}
_logger. Warning (sqle);
}
}
}
Then in my grain of support, I'm going to call this method
MyAppModuleImpl am = (MyAppModuleImpl) dc_bc.getDataControl () .getApplicationModule ();
try {}
[ String []] attributes = / / initialize the table attributes;
AM. processQuery (attributes);
} catch (Exception e) {}
manage the code here
}
My question is in MyAppModuleImpl,
I got the connection, statement and result set. But I doubt that I really need to close the connection (in bold)?
Well, the JNDI Data Source is recommended because you can reconfigure it without redeploying app and connection pool can be shared between different applications on the same server app...
In fact, in my app, we use JNDI, is it out of the frame?
Framework will publish connection acquired by AM to the connection pool, and application server (WLS) will manage connections in the connection pool.
Dario
Tags: Java
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