eric6/SqlBrowser/SqlConnectionWidget.py

Wed, 30 Dec 2020 11:00:44 +0100

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Wed, 30 Dec 2020 11:00:44 +0100
branch
maintenance
changeset 7924
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parent 7781
607a6098cb44
child 8143
2c730d5fd177
permissions
-rw-r--r--

Updated copyright for 2021.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2009 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing a widget showing the SQL connections.
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8 """
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9
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10 from PyQt5.QtCore import pyqtSignal, Qt
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11 from PyQt5.QtWidgets import (
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12 QWidget, QHeaderView, QTreeWidget, QVBoxLayout, QTreeWidgetItem, QAction
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13 )
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14 from PyQt5.QtSql import QSqlDatabase
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15
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16
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17 class SqlConnectionWidget(QWidget):
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18 """
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19 Class implementing a widget showing the SQL connections.
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20
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21 @signal tableActivated(str) emitted after the entry for a table has been
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22 activated
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23 @signal schemaRequested(str) emitted when the schema display is requested
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24 @signal cleared() emitted after the connection tree has been cleared
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25 """
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26 tableActivated = pyqtSignal(str)
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27 schemaRequested = pyqtSignal(str)
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28 cleared = pyqtSignal()
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29
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30 def __init__(self, parent=None):
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31 """
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32 Constructor
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33
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34 @param parent reference to the parent widget (QWidget)
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35 """
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36 super(SqlConnectionWidget, self).__init__(parent)
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37
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38 layout = QVBoxLayout(self)
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39 layout.setContentsMargins(0, 0, 0, 0)
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40
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41 self.__connectionTree = QTreeWidget(self)
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42 self.__connectionTree.setObjectName("connectionTree")
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43 self.__connectionTree.setHeaderLabels([self.tr("Database")])
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44 self.__connectionTree.header().setSectionResizeMode(
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45 QHeaderView.Stretch)
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46 refreshAction = QAction(self.tr("Refresh"), self.__connectionTree)
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47 self.__schemaAction = QAction(
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48 self.tr("Show Schema"), self.__connectionTree)
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49
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50 refreshAction.triggered.connect(self.refresh)
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51 self.__schemaAction.triggered.connect(self.showSchema)
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52
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53 self.__connectionTree.addAction(refreshAction)
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54 self.__connectionTree.addAction(self.__schemaAction)
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55 self.__connectionTree.setContextMenuPolicy(Qt.ActionsContextMenu)
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56
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57 layout.addWidget(self.__connectionTree)
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58
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59 self.__activating = False
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60
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61 self.__connectionTree.itemActivated.connect(self.__itemActivated)
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62 self.__connectionTree.currentItemChanged.connect(
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63 self.__currentItemChanged)
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64
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65 self.__activeDb = ""
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66
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67 def refresh(self):
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68 """
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69 Public slot to refresh the connection tree.
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70 """
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71 self.__connectionTree.clear()
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72 self.cleared.emit()
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73
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74 connectionNames = QSqlDatabase.connectionNames()
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75
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76 foundActiveDb = False
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77 for name in connectionNames:
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78 root = QTreeWidgetItem(self.__connectionTree)
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79 db = QSqlDatabase.database(name, False)
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80 root.setText(0, self.__dbCaption(db))
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81 if name == self.__activeDb:
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82 foundActiveDb = True
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83 self.__setActive(root)
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84 if db.isOpen():
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85 tables = db.tables()
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86 for table in tables:
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87 itm = QTreeWidgetItem(root)
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88 itm.setText(0, table)
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89
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90 if not foundActiveDb and connectionNames:
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91 self.__activeDb = connectionNames[0]
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92 self.__setActive(self.__connectionTree.topLevelItem(0))
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93
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94 def showSchema(self):
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95 """
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96 Public slot to show schema data of a database.
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97 """
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98 cItm = self.__connectionTree.currentItem()
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99 if cItm is None or cItm.parent() is None:
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100 return
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101 self.__setActive(cItm.parent())
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102 self.schemaRequested.emit(cItm.text(0))
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103
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104 def __itemActivated(self, itm, column):
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105 """
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106 Private slot handling the activation of an item.
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107
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108 @param itm reference to the item (QTreeWidgetItem)
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109 @param column column that was activated (integer)
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110 """
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111 if itm is None:
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112 return
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113
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114 if not self.__activating:
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115 self.__activating = True
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116 if itm.parent() is None:
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117 self.__setActive(itm)
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118 else:
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119 self.__setActive(itm.parent())
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120 self.tableActivated.emit(itm.text(0))
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121 self.__activating = False
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122
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123 def __currentItemChanged(self, current, previous):
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124 """
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125 Private slot handling a change of the current item.
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126
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127 @param current reference to the new current item (QTreeWidgetItem)
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128 @param previous reference to the previous current item
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129 (QTreeWidgetItem)
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130 """
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131 self.__schemaAction.setEnabled(
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132 current is not None and current.parent() is not None)
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133
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134 def __dbCaption(self, db):
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135 """
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136 Private method to assemble a string for the caption.
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137
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138 @param db reference to the database object (QSqlDatabase)
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139 @return caption string (string)
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140 """
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141 nm = db.driverName()
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142 nm += ":"
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143 if db.userName():
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144 nm += db.userName()
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145 nm += "@"
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146 nm += db.databaseName()
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147 return nm
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148
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149 def __setBold(self, itm, bold):
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150 """
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151 Private slot to set the font to bold.
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152
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153 @param itm reference to the item to be changed (QTreeWidgetItem)
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154 @param bold flag indicating bold (boolean)
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155 """
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156 font = itm.font(0)
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157 font.setBold(bold)
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158 itm.setFont(0, font)
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159
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160 def currentDatabase(self):
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161 """
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162 Public method to get the current database.
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163
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164 @return reference to the current database (QSqlDatabase)
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165 """
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166 return QSqlDatabase.database(self.__activeDb)
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167
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168 def __setActive(self, itm):
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169 """
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170 Private slot to set an item to active.
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171
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172 @param itm reference to the item to set as the active item
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173 (QTreeWidgetItem)
0
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174 """
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175 for index in range(self.__connectionTree.topLevelItemCount()):
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176 if self.__connectionTree.topLevelItem(index).font(0).bold():
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177 self.__setBold(
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178 self.__connectionTree.topLevelItem(index), False)
0
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179
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180 if itm is None:
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181 return
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182
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183 self.__setBold(itm, True)
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184 self.__activeDb = QSqlDatabase.connectionNames()[
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185 self.__connectionTree.indexOfTopLevelItem(itm)]

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