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I wrote a script (for QGIS 3) that saves styles for all visible vector layers in QML and SLD files:

import processing
self=qgis.utils
layers = self.iface.mapCanvas().layers()

for layer in layers:
    layerType = layer.type()
    if layerType == QgsMapLayer.VectorLayer:
        name = layer.name()
        pathqml = 'C:/Style/QML/'+str(name)+'.qml'  
        pathsld = 'C:/Style/SLD/'+str(name)+'.sld'  
        layer.saveNamedStyle(pathqml)
        layer.saveSldStyle(pathsld)

How can I do this for the layers from SQLite, PostgreSQL/PostGIS ?

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    Are the sqlite and postgis layers not loaded into your Q project? Are you wanting to save those layer styles to a folder or to a database? – artwork21 Mar 23 '18 at 13:12
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To save the style into a database use:

layer.saveStyleToDatabase("NameOfStyle","Description",True,"uiFileContent")
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  • here database mean postgres , what if there are multiple database connected ? – Abhijit Gujar Jun 28 '18 at 5:05

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