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Quick and dirty patch to DB-Manager after PR 8831

The "comments" PR 8831 added support for postgres only
(and broke all the others backends).

I'd be in favor of a revert of the whole original PR but
this patch restores functionality and could be an acceptable
temporary fix until the comments PR is reworked in a more
maintainable and elegant way.

Fixes #21151 btw
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elpaso committed Feb 4, 2019
1 parent 9a8c0d2 commit cd6ce76480f19db651a5dd33134b7963b1b74daa
@@ -301,6 +301,10 @@ def __init__(self, row, table):
self.num, self.name, self.dataType, self.notNull, self.default, self.primaryKey = row
self.hasDefault = self.default

def getComment(self):
"""Returns the comment for a field"""
return ''


class GPKGTableIndex(TableIndex):

@@ -557,6 +557,10 @@ def update(self, new_name, new_type_str=None, new_not_null=None,
self.table().refreshIndexes()
return ret

def getComment(self):
"""Returns the comment for a field"""
return ''


class ORTableConstraint(TableConstraint):

@@ -294,6 +294,10 @@ def __init__(self, row, table):
self.num, self.name, self.dataType, self.notNull, self.default, self.primaryKey = row
self.hasDefault = self.default

def getComment(self):
"""Returns the comment for a field"""
return ''


class SLTableIndex(TableIndex):

@@ -192,3 +192,7 @@ def __init__(self, row, table):
TableField.__init__(self, table)
self.num, self.name, self.dataType, self.notNull, self.default, self.primaryKey = row
self.hasDefault = self.default

def getComment(self):
"""Returns the comment for a field"""
return ''
@@ -56,18 +56,23 @@ def setField(self, fld):
self.chkNull.setChecked(not fld.notNull)
if fld.hasDefault:
self.editDefault.setText(fld.default)
# Check with SQL query if a comment exists for the field
sql_cpt = "Select count(*) from pg_description pd, pg_class pc, pg_attribute pa where relname = '%s' and attname = '%s' and pa.attrelid = pc.oid and pd.objoid = pc.oid and pd.objsubid = pa.attnum" % (self.table.name, self.editName.text())
# Get the comment for the field with SQL Query
sql = "Select pd.description from pg_description pd, pg_class pc, pg_attribute pa where relname = '%s' and attname = '%s' and pa.attrelid = pc.oid and pd.objoid = pc.oid and pd.objsubid = pa.attnum" % (self.table.name, self.editName.text())
c = self.db.connector._execute(None, sql_cpt) # Execute check query
res = self.db.connector._fetchone(c)[0] # Fetch data
# Check if result is 1 then it's ok, else we don't want to get a value
if res == 1:
c = self.db.connector._execute(None, sql) # Execute query returning the comment value
res = self.db.connector._fetchone(c)[0] # Fetch the comment value
self.db.connector._close_cursor(c) # Close cursor
self.editCom.setText(res) # Set comment value
# This is an ugly patch, but the comments PR https://github.com/qgis/QGIS/pull/8831 added
# support for postgres only and broke all the others :(
try:
# Check with SQL query if a comment exists for the field
sql_cpt = "Select count(*) from pg_description pd, pg_class pc, pg_attribute pa where relname = '%s' and attname = '%s' and pa.attrelid = pc.oid and pd.objoid = pc.oid and pd.objsubid = pa.attnum" % (self.table.name, self.editName.text())
# Get the comment for the field with SQL Query
sql = "Select pd.description from pg_description pd, pg_class pc, pg_attribute pa where relname = '%s' and attname = '%s' and pa.attrelid = pc.oid and pd.objoid = pc.oid and pd.objsubid = pa.attnum" % (self.table.name, self.editName.text())
c = self.db.connector._execute(None, sql_cpt) # Execute check query
res = self.db.connector._fetchone(c)[0] # Fetch data
# Check if result is 1 then it's ok, else we don't want to get a value
if res == 1:
c = self.db.connector._execute(None, sql) # Execute query returning the comment value
res = self.db.connector._fetchone(c)[0] # Fetch the comment value
self.db.connector._close_cursor(c) # Close cursor
self.editCom.setText(res) # Set comment value
except:
self.editCom.setEnabled(False)

def getField(self, newCopy=False):
fld = TableField(self.table) if not self.fld or newCopy else self.fld
@@ -29,7 +29,7 @@
from qgis.utils import OverrideCursor

from .db_plugins.data_model import TableFieldsModel, TableConstraintsModel, TableIndexesModel
from .db_plugins.plugin import BaseError
from .db_plugins.plugin import BaseError, DbError
from .dlg_db_error import DlgDbError

from .dlg_field_properties import DlgFieldProperties
@@ -333,25 +333,37 @@ def deleteIndex(self):
DlgDbError.showError(e, self)

def createComment(self):
#Function that add a comment to the selected table
"""Adds a comment to the selected table"""

try:
#Using the db connector, executing de SQL query Comment on table
self.db.connector._execute(None, 'COMMENT ON TABLE "{0}"."{1}" IS E\'{2}\';'.format(self.table.schema().name, self.table.name, self.viewComment.text()))
except DbError as e:
DlgDbError.showError(e, self)
return
except Exception as e:
# This is an ugly patch, but the comments PR https://github.com/qgis/QGIS/pull/8831 added
# support for postgres only and broke all the others :(
QMessageBox.information(self, self.tr("Add comment"), self.tr("Comments are not supported for this database."))
return
self.refresh()
#Display successful message
QMessageBox.information(self, self.tr("Add comment"), self.tr("Table successfully commented"))

def deleteComment(self):
#Function that drop the comment to the selected table
"""Drops the comment on the selected table"""

try:
#Using the db connector, executing de SQL query Comment on table using the NULL definition
self.db.connector._execute(None, 'COMMENT ON TABLE "{0}"."{1}" IS NULL;'.format(self.table.schema().name, self.table.name))
except DbError as e:
DlgDbError.showError(e, self)
return
except Exception as e:
# This is an ugly patch, but the comments PR https://github.com/qgis/QGIS/pull/8831 added
# support for postgres only and broke all the others :(
QMessageBox.information(self, self.tr("Add comment"), self.tr("Comments are not supported for this database."))
return
self.refresh()
#Refresh line edit, put a void comment
self.viewComment.setText('')

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