The Theory
Sometimes when you work with a Mbo in a MboSet and you change fields in a Mbo it can be useful to get the original value of the field before the change or the last value of the field before the change. So basically a field can have three different values we can ask for:
For that purpose we can use the MboValueAdapter and MboValue classes which are automatically initialized with every Mbo retrieved from the system
The CurrentValue of a field usually can be red by the following Method via a Mbo:
wonum = mbo.getString("WONUM") # wonum is of type string
The same action can also be achived using the MboValueAdapter:
mboValue = mbo.getMboValue("WONUM") # mboValue is of Type mboValue
currentValue = mboValue.getCurrentValue() # currentValue is of type MaxType
wonum = currentValue.asString() # wonum is of type string
# The previous 3 lines can be merged to a shorter Version:
wonum = mbo.getMboValue("WONUM").getCurrentValue().asString()
currentValue = mboValue.getCurrentValue() # currentValue is of type MaxType
wonum = currentValue.asString() # wonum is of type string
# The previous 3 lines can be merged to a shorter Version:
wonum = mbo.getMboValue("WONUM").getCurrentValue().asString()
Now the short version to get the PreviousValue which can only be get via the MboValueAdapter:
wonum = mbo.getMboValue("WONUM").getPreviousValue().asString()
And the InitialValue which represents the state of the field when the MboSet was initialized:
# Version via Mbo:
wonum = mbo.getDatabaseValue("WONUM")
# Version via ValueAdapter
wonum = mbo.getMboValue("WONUM").getInitialValue().asString()
wonum = mbo.getDatabaseValue("WONUM")
# Version via ValueAdapter
wonum = mbo.getMboValue("WONUM").getInitialValue().asString()
A practical Example
The scenario I will show you in this blog is based on the Item Mbo and the description field. I will change this field several times and always show you the initial, previous and current value of this field. Precisely we will do the following:
As you can see we have 3 point where we verify our output. The following script can be easily created as a new Automation Script without launchpoint. Just take it and try it out! You can run the Script directly from the Automation Script Application.
#AUTOSCRIPT:MBOVALUEADAPTER
#DESCRIPTION:Demo to show usage of mboValueAdapter
#LOGLEVEL:ERROR
from psdi.server import MXServer
from psdi.iface.mic import MicService
# Initialize some stuff
mxServer = MXServer.getMXServer()
micService = MicService(mxServer)
micService.init()
userInfo = micService.getNewUserInfo()
itemSet = mxServer.getMboSet('ITEM', userInfo)
itemMbo = itemSet.moveFirst()
# Get Value for Field Description
stringValue = itemMbo.getString("DESCRIPTION")
itemMbo.setValue("DESCRIPTION", stringValue + "_new")
# Get the new Value again
stringValueNew = itemMbo.getString("DESCRIPTION")
itemMbo.setValue("DESCRIPTION", stringValue + "_new_new")
# Get the new Value again
stringValueNewNew = itemMbo.getString("DESCRIPTION")
print "Original Value = " + stringValue
print "Value after 1. Change = " + stringValueNew
print "Value after 2. Change = " + stringValueNewNew
# Now work with the new MboValue Class
mboValue = itemMbo.getMboValue("DESCRIPTION")
initialValueAsString = mboValue.getInitialValue().asString()
previousValueAsString = mboValue.getPreviousValue().asString()
currentValueAsString = mboValue.getCurrentValue().asString()
print "-----------------------------------------------------------"
print "Now Mbo Value Results"
print "-----------------------------------------------------------"
print "Initial Value = " + initialValueAsString
print "Previous Value before 2. change = " + previousValueAsString
print "Current Value from MboValue = " + currentValueAsString
itemSet.save()
print "-----------------------------------------------------------"
print "Now After itemSet.save()"
print "-----------------------------------------------------------"
mboValue = itemMbo.getMboValue("DESCRIPTION")
initialValueAsString = mboValue.getInitialValue().asString()
previousValueAsString = mboValue.getPreviousValue().asString()
currentValueAsString = mboValue.getCurrentValue().asString()
print "Initial Value = " + initialValueAsString
print "Previous Value before 2. change = " + previousValueAsString
print "Current Value from MboValue = " + currentValueAsString
itemSet.reset()
itemSet = mxServer.getMboSet('ITEM', userInfo)
itemMbo = itemSet.moveFirst()
print "-----------------------------------------------------------"
print "Now After itemSet.reset()"
print "-----------------------------------------------------------"
mboValue = itemMbo.getMboValue("DESCRIPTION")
initialValueAsString = mboValue.getInitialValue().asString()
previousValueAsString = mboValue.getPreviousValue().asString()
currentValueAsString = mboValue.getCurrentValue().asString()
print "Initial Value = " + initialValueAsString
print "Previous Value before 2. change = " + previousValueAsString
print "Current Value from MboValue = " + currentValueAsString
#DESCRIPTION:Demo to show usage of mboValueAdapter
#LOGLEVEL:ERROR
from psdi.server import MXServer
from psdi.iface.mic import MicService
# Initialize some stuff
mxServer = MXServer.getMXServer()
micService = MicService(mxServer)
micService.init()
userInfo = micService.getNewUserInfo()
itemSet = mxServer.getMboSet('ITEM', userInfo)
itemMbo = itemSet.moveFirst()
# Get Value for Field Description
stringValue = itemMbo.getString("DESCRIPTION")
itemMbo.setValue("DESCRIPTION", stringValue + "_new")
# Get the new Value again
stringValueNew = itemMbo.getString("DESCRIPTION")
itemMbo.setValue("DESCRIPTION", stringValue + "_new_new")
# Get the new Value again
stringValueNewNew = itemMbo.getString("DESCRIPTION")
print "Original Value = " + stringValue
print "Value after 1. Change = " + stringValueNew
print "Value after 2. Change = " + stringValueNewNew
# Now work with the new MboValue Class
mboValue = itemMbo.getMboValue("DESCRIPTION")
initialValueAsString = mboValue.getInitialValue().asString()
previousValueAsString = mboValue.getPreviousValue().asString()
currentValueAsString = mboValue.getCurrentValue().asString()
print "-----------------------------------------------------------"
print "Now Mbo Value Results"
print "-----------------------------------------------------------"
print "Initial Value = " + initialValueAsString
print "Previous Value before 2. change = " + previousValueAsString
print "Current Value from MboValue = " + currentValueAsString
itemSet.save()
print "-----------------------------------------------------------"
print "Now After itemSet.save()"
print "-----------------------------------------------------------"
mboValue = itemMbo.getMboValue("DESCRIPTION")
initialValueAsString = mboValue.getInitialValue().asString()
previousValueAsString = mboValue.getPreviousValue().asString()
currentValueAsString = mboValue.getCurrentValue().asString()
print "Initial Value = " + initialValueAsString
print "Previous Value before 2. change = " + previousValueAsString
print "Current Value from MboValue = " + currentValueAsString
itemSet.reset()
itemSet = mxServer.getMboSet('ITEM', userInfo)
itemMbo = itemSet.moveFirst()
print "-----------------------------------------------------------"
print "Now After itemSet.reset()"
print "-----------------------------------------------------------"
mboValue = itemMbo.getMboValue("DESCRIPTION")
initialValueAsString = mboValue.getInitialValue().asString()
previousValueAsString = mboValue.getPreviousValue().asString()
currentValueAsString = mboValue.getCurrentValue().asString()
print "Initial Value = " + initialValueAsString
print "Previous Value before 2. change = " + previousValueAsString
print "Current Value from MboValue = " + currentValueAsString
The output should look similar to the following:
Original Value = IT Services
Value after 1. Change = IT Services_new
Value after 2. Change = IT Services_new_new
-----------------------------------------------------------------
Now Mbo Value Results
-----------------------------------------------------------------
Initial Value = IT Services
Previous Value before 2. change = IT Services_new
Current Value from MboValue = IT Services_new_new
-----------------------------------------------------------------
Now After itemSet.save()
-----------------------------------------------------------------
Initial Value = IT Services
Previous Value before 2. change = IT Services_new
Current Value from MboValue = IT Services_new_new
-----------------------------------------------------------------
Now After itemSet.reset()
-----------------------------------------------------------------
Initial Value = IT Services_new_new
Previous Value before 2. change = IT Services_new_new
Current Value from MboValue = IT Services_new_new
Value after 1. Change = IT Services_new
Value after 2. Change = IT Services_new_new
-----------------------------------------------------------------
Now Mbo Value Results
-----------------------------------------------------------------
Initial Value = IT Services
Previous Value before 2. change = IT Services_new
Current Value from MboValue = IT Services_new_new
-----------------------------------------------------------------
Now After itemSet.save()
-----------------------------------------------------------------
Initial Value = IT Services
Previous Value before 2. change = IT Services_new
Current Value from MboValue = IT Services_new_new
-----------------------------------------------------------------
Now After itemSet.reset()
-----------------------------------------------------------------
Initial Value = IT Services_new_new
Previous Value before 2. change = IT Services_new_new
Current Value from MboValue = IT Services_new_new
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