Mrthdrb

I want to replace a string in ALL FIELDS / Columns of table without having to do it using field calculator in every field manually using replace( "RoadName1" ,'Wharf','WharfXXX').

I have

layer = iface.activeLayer()
searchText = "Wharf"
replaceText = "WharfXXX"
for field in layer.fields():
 fieldName=field.name()
 print (fieldName)
 for feature in layer.getFeatures():
 inText=str(feature[fieldName])
 #print (inText)
 if searchText in inText:
 #try QgsStringReplacement
 QgsStringReplacement(inText,replaceText, False, False)
 #try Field Calculator

 print ("Replaced %s with %s" %(inText,replaceText))
 else:
 #print ("not found")
 pass

It seems to work but I am not seeing any changes in the dataset.

I can't find any example implementations of https://qgis.org/api/classQgsStringReplacement.html

Does this function do what I think it's supposed to -i.e. replace text when it matches?

I guess I could configure field calc to use these inputs but the function above seems cleaner in the long run.

processing.run("qgis:fieldcalculator", 'INPUT':'test.tab)

You can try code below (backup data prior):

layer = iface.activeLayer()
textfields = [f.name() for f in layer.fields() if f.typeName()=='String']

replacedict = 'Hus,':'HusXYZ,','1':'ONE'

with edit(layer):
 for feature in layer.getFeatures():
 for f in textfields:
 value = feature[f]
 if type(value)== str:
 new_value = ' '.join([replacedict[word] if word in replacedict else word for word in value.split()])
 _=feature.setAttribute(feature.fieldNameIndex(f), new_value)
 _=layer.updateFeature(feature)

From:

To:

You can solve your problem using layer.changeAttributeValue() in an edit session.

layer = iface.activeLayer()
searchText = "Wharf"
replaceText = "WharfXXX"

# Start edit session for the layer
layer.startEditing()

for field in layer.fields():
 fieldName = field.name()
 # get field index
 fieldIndex = layer.fields().indexFromName(fieldName)

 for feature in layer.getFeatures():
 inText = str(feature[fieldName])

 if searchText in inText:
 # change inText
 outText = inText.replace(searchText, replaceText)
 # change field value of the attribute (in memory)
 layer.changeAttributeValue(feature.id(), fieldIndex, outText)

# save changes
layer.commitChanges()

Or you can use layer.dataProvider().changeAttributeValues(). In that case, you can change multiple fields at once. To see changes you may need to reopen the attribute table.

layer = iface.activeLayer()
searchText = "Wharf"
replaceText = "WharfXXX"

# get data provider
dpr = layer.dataProvider()

for field in layer.fields():
 fieldName=field.name()

 for feature in layer.getFeatures():
 inText = str(feature[fieldName])
 # get field index
 fieldIndex = layer.fields().indexFromName(fieldName)

 if searchText in inText:
 # change inText
 outText = inText.replace(searchText, replaceText)
 # save changes
 dpr.changeAttributeValues(feature.id(): fieldIndex: outText)