# -*- coding: utf-8 -*-
"""
/***************************************************************************
Name : DB Manager
Description : Database manager plugin for QGIS
Date : May 23, 2011
copyright : (C) 2011 by Giuseppe Sucameli
email : brush.tyler@gmail.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
from builtins import str
from builtins import range
from qgis.PyQt.QtCore import Qt, QTime, QRegExp, QAbstractTableModel
from qgis.PyQt.QtGui import QFont, QStandardItemModel, QStandardItem
from qgis.PyQt.QtWidgets import QApplication
from .plugin import DbError
class BaseTableModel(QAbstractTableModel):
def __init__(self, header=None, data=None, parent=None):
QAbstractTableModel.__init__(self, parent)
self._header = header if header else []
self.resdata = data if data else []
def headerToString(self, sep=u"\t"):
header = self._header
return sep.join(header)
def rowToString(self, row, sep=u"\t"):
text = u""
for col in range(self.columnCount()):
text += u"%s" % self.getData(row, col) + sep
return text[:-1]
def getData(self, row, col):
return self.resdata[row][col]
def columnNames(self):
return list(self._header)
def rowCount(self, parent=None):
return len(self.resdata)
def columnCount(self, parent=None):
return len(self._header)
def data(self, index, role):
if role not in [Qt.DisplayRole,
Qt.EditRole,
Qt.FontRole]:
return None
val = self.getData(index.row(), index.column())
if role == Qt.EditRole:
return val
if role == Qt.FontRole: # draw NULL in italic
if val is not None:
return None
f = QFont()
f.setItalic(True)
return f
if val is None:
return "NULL"
elif isinstance(val, memoryview):
# hide binary data
return None
elif isinstance(val, str) and len(val) > 300:
# too much data to display, elide the string
val = val[:300]
try:
return str(val) # convert to Unicode
except UnicodeDecodeError:
return str(val, 'utf-8', 'replace') # convert from utf8 and replace errors (if any)
def headerData(self, section, orientation, role):
if role != Qt.DisplayRole:
return None
if orientation == Qt.Vertical:
# header for a row
return section + 1
else:
# header for a column
return self._header[section]
class TableDataModel(BaseTableModel):
def __init__(self, table, parent=None):
self.db = table.database().connector
self.table = table
fieldNames = [x.name for x in table.fields()]
BaseTableModel.__init__(self, fieldNames, None, parent)
# get table fields
self.fields = []
for fld in table.fields():
self.fields.append(self._sanitizeTableField(fld))
self.fetchedCount = 201
self.fetchedFrom = -self.fetchedCount - 1 # so the first call to getData will exec fetchMoreData(0)
def _sanitizeTableField(self, field):
""" quote column names to avoid some problems (e.g. columns with upper case) """
return self.db.quoteId(field)
def getData(self, row, col):
if row < self.fetchedFrom or row >= self.fetchedFrom + self.fetchedCount:
margin = self.fetchedCount / 2
start = self.rowCount() - margin if row + margin >= self.rowCount() else row - margin
if start < 0:
start = 0
self.fetchMoreData(start)
return self.resdata[row - self.fetchedFrom][col]
def fetchMoreData(self, row_start):
pass
def rowCount(self, index=None):
# case for tables with no columns ... any reason to use them? :-)
return self.table.rowCount if self.table.rowCount is not None and self.columnCount(index) > 0 else 0
class SqlResultModel(BaseTableModel):
def __init__(self, db, sql, parent=None):
self.db = db.connector
t = QTime()
t.start()
c = self.db._execute(None, str(sql))
self._secs = t.elapsed() / 1000.0
del t
self._affectedRows = 0
data = []
header = self.db._get_cursor_columns(c)
if header is None:
header = []
try:
if len(header) > 0:
data = self.db._fetchall(c)
self._affectedRows = c.rowcount
except DbError:
# nothing to fetch!
data = []
header = []
BaseTableModel.__init__(self, header, data, parent)
# commit before closing the cursor to make sure that the changes are stored
self.db._commit()
c.close()
del c
def secs(self):
return self._secs
def affectedRows(self):
return self._affectedRows
class SimpleTableModel(QStandardItemModel):
def __init__(self, header, editable=False, parent=None):
self.header = header
self.editable = editable
QStandardItemModel.__init__(self, 0, len(self.header), parent)
def rowFromData(self, data):
row = []
for c in data:
item = QStandardItem(str(c))
item.setFlags((item.flags() | Qt.ItemIsEditable) if self.editable else (item.flags() & ~Qt.ItemIsEditable))
row.append(item)
return row
def headerData(self, section, orientation, role):
if orientation == Qt.Horizontal and role == Qt.DisplayRole:
return self.header[section]
return None
def _getNewObject(self):
pass
def getObject(self, row):
return self._getNewObject()
def getObjectIter(self):
for row in range(self.rowCount()):
yield self.getObject(row)
class TableFieldsModel(SimpleTableModel):
def __init__(self, parent, editable=False):
SimpleTableModel.__init__(self, ['Name', 'Type', 'Null', 'Default'], editable, parent)
def headerData(self, section, orientation, role):
if orientation == Qt.Vertical and role == Qt.DisplayRole:
return section + 1
return SimpleTableModel.headerData(self, section, orientation, role)
def flags(self, index):
flags = SimpleTableModel.flags(self, index)
if index.column() == 2 and flags & Qt.ItemIsEditable: # set Null column as checkable instead of editable
flags = flags & ~Qt.ItemIsEditable | Qt.ItemIsUserCheckable
return flags
def append(self, fld):
data = [fld.name, fld.type2String(), not fld.notNull, fld.default2String()]
self.appendRow(self.rowFromData(data))
row = self.rowCount() - 1
self.setData(self.index(row, 0), fld, Qt.UserRole)
self.setData(self.index(row, 1), fld.primaryKey, Qt.UserRole)
self.setData(self.index(row, 2), None, Qt.DisplayRole)
self.setData(self.index(row, 2), Qt.Unchecked if fld.notNull else Qt.Checked, Qt.CheckStateRole)
def _getNewObject(self):
from .plugin import TableField
return TableField(None)
def getObject(self, row):
val = self.data(self.index(row, 0), Qt.UserRole)
fld = val if val is not None else self._getNewObject()
fld.name = self.data(self.index(row, 0)) or ""
typestr = self.data(self.index(row, 1)) or ""
regex = QRegExp("([^\(]+)\(([^\)]+)\)")
startpos = regex.indexIn(typestr)
if startpos >= 0:
fld.dataType = regex.cap(1).strip()
fld.modifier = regex.cap(2).strip()
else:
fld.modifier = None
fld.dataType = typestr
fld.notNull = self.data(self.index(row, 2), Qt.CheckStateRole) == Qt.Unchecked
fld.primaryKey = self.data(self.index(row, 1), Qt.UserRole)
return fld
def getFields(self):
flds = []
for fld in self.getObjectIter():
flds.append(fld)
return flds
class TableConstraintsModel(SimpleTableModel):
def __init__(self, parent, editable=False):
SimpleTableModel.__init__(self, [QApplication.translate("DBManagerPlugin", 'Name'),
QApplication.translate("DBManagerPlugin", 'Type'),
QApplication.translate("DBManagerPlugin", 'Column(s)')], editable, parent)
def append(self, constr):
field_names = [str(k_v[1].name) for k_v in iter(list(constr.fields().items()))]
data = [constr.name, constr.type2String(), u", ".join(field_names)]
self.appendRow(self.rowFromData(data))
row = self.rowCount() - 1
self.setData(self.index(row, 0), constr, Qt.UserRole)
self.setData(self.index(row, 1), constr.type, Qt.UserRole)
self.setData(self.index(row, 2), constr.columns, Qt.UserRole)
def _getNewObject(self):
from .plugin import TableConstraint
return TableConstraint(None)
def getObject(self, row):
constr = self.data(self.index(row, 0), Qt.UserRole)
if not constr:
constr = self._getNewObject()
constr.name = self.data(self.index(row, 0)) or ""
constr.type = self.data(self.index(row, 1), Qt.UserRole)
constr.columns = self.data(self.index(row, 2), Qt.UserRole)
return constr
def getConstraints(self):
constrs = []
for constr in self.getObjectIter():
constrs.append(constr)
return constrs
class TableIndexesModel(SimpleTableModel):
def __init__(self, parent, editable=False):
SimpleTableModel.__init__(self, [QApplication.translate("DBManagerPlugin", 'Name'),
QApplication.translate("DBManagerPlugin", 'Column(s)')], editable, parent)
def append(self, idx):
field_names = [str(k_v1[1].name) for k_v1 in iter(list(idx.fields().items()))]
data = [idx.name, u", ".join(field_names)]
self.appendRow(self.rowFromData(data))
row = self.rowCount() - 1
self.setData(self.index(row, 0), idx, Qt.UserRole)
self.setData(self.index(row, 1), idx.columns, Qt.UserRole)
def _getNewObject(self):
from .plugin import TableIndex
return TableIndex(None)
def getObject(self, row):
idx = self.data(self.index(row, 0), Qt.UserRole)
if not idx:
idx = self._getNewObject()
idx.name = self.data(self.index(row, 0))
idx.columns = self.data(self.index(row, 1), Qt.UserRole)
return idx
def getIndexes(self):
idxs = []
for idx in self.getObjectIter():
idxs.append(idx)
return idxs