Mercurial Repositories > eric / file comparison
comparison: eric7/SqlBrowser/SqlConnectionWidget.py
eric7/SqlBrowser/SqlConnectionWidget.py
- branch
- eric7
- changeset 8312
- 800c432b34c8
- parent 8218
- 7c09585bd960
- child 8318
- 962bce857696
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| 8311:4e8b98454baa | 8312:800c432b34c8 |
|---|---|
| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2009 - 2021 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing a widget showing the SQL connections. | |
| 8 """ | |
| 9 | |
| 10 from PyQt5.QtCore import pyqtSignal, Qt | |
| 11 from PyQt5.QtWidgets import ( | |
| 12 QWidget, QHeaderView, QTreeWidget, QVBoxLayout, QTreeWidgetItem, QAction | |
| 13 ) | |
| 14 from PyQt5.QtSql import QSqlDatabase | |
| 15 | |
| 16 | |
| 17 class SqlConnectionWidget(QWidget): | |
| 18 """ | |
| 19 Class implementing a widget showing the SQL connections. | |
| 20 | |
| 21 @signal tableActivated(str) emitted after the entry for a table has been | |
| 22 activated | |
| 23 @signal schemaRequested(str) emitted when the schema display is requested | |
| 24 @signal cleared() emitted after the connection tree has been cleared | |
| 25 """ | |
| 26 tableActivated = pyqtSignal(str) | |
| 27 schemaRequested = pyqtSignal(str) | |
| 28 cleared = pyqtSignal() | |
| 29 | |
| 30 def __init__(self, parent=None): | |
| 31 """ | |
| 32 Constructor | |
| 33 | |
| 34 @param parent reference to the parent widget (QWidget) | |
| 35 """ | |
| 36 super().__init__(parent) | |
| 37 | |
| 38 layout = QVBoxLayout(self) | |
| 39 layout.setContentsMargins(0, 0, 0, 0) | |
| 40 | |
| 41 self.__connectionTree = QTreeWidget(self) | |
| 42 self.__connectionTree.setObjectName("connectionTree") | |
| 43 self.__connectionTree.setHeaderLabels([self.tr("Database")]) | |
| 44 self.__connectionTree.header().setSectionResizeMode( | |
| 45 QHeaderView.ResizeMode.Stretch) | |
| 46 refreshAction = QAction(self.tr("Refresh"), self.__connectionTree) | |
| 47 self.__schemaAction = QAction( | |
| 48 self.tr("Show Schema"), self.__connectionTree) | |
| 49 | |
| 50 refreshAction.triggered.connect(self.refresh) | |
| 51 self.__schemaAction.triggered.connect(self.showSchema) | |
| 52 | |
| 53 self.__connectionTree.addAction(refreshAction) | |
| 54 self.__connectionTree.addAction(self.__schemaAction) | |
| 55 self.__connectionTree.setContextMenuPolicy( | |
| 56 Qt.ContextMenuPolicy.ActionsContextMenu) | |
| 57 | |
| 58 layout.addWidget(self.__connectionTree) | |
| 59 | |
| 60 self.__activating = False | |
| 61 | |
| 62 self.__connectionTree.itemActivated.connect(self.__itemActivated) | |
| 63 self.__connectionTree.currentItemChanged.connect( | |
| 64 self.__currentItemChanged) | |
| 65 | |
| 66 self.__activeDb = "" | |
| 67 | |
| 68 def refresh(self): | |
| 69 """ | |
| 70 Public slot to refresh the connection tree. | |
| 71 """ | |
| 72 self.__connectionTree.clear() | |
| 73 self.cleared.emit() | |
| 74 | |
| 75 connectionNames = QSqlDatabase.connectionNames() | |
| 76 | |
| 77 foundActiveDb = False | |
| 78 for name in connectionNames: | |
| 79 root = QTreeWidgetItem(self.__connectionTree) | |
| 80 db = QSqlDatabase.database(name, False) | |
| 81 root.setText(0, self.__dbCaption(db)) | |
| 82 if name == self.__activeDb: | |
| 83 foundActiveDb = True | |
| 84 self.__setActive(root) | |
| 85 if db.isOpen(): | |
| 86 tables = db.tables() | |
| 87 for table in tables: | |
| 88 itm = QTreeWidgetItem(root) | |
| 89 itm.setText(0, table) | |
| 90 | |
| 91 if not foundActiveDb and connectionNames: | |
| 92 self.__activeDb = connectionNames[0] | |
| 93 self.__setActive(self.__connectionTree.topLevelItem(0)) | |
| 94 | |
| 95 def showSchema(self): | |
| 96 """ | |
| 97 Public slot to show schema data of a database. | |
| 98 """ | |
| 99 cItm = self.__connectionTree.currentItem() | |
| 100 if cItm is None or cItm.parent() is None: | |
| 101 return | |
| 102 self.__setActive(cItm.parent()) | |
| 103 self.schemaRequested.emit(cItm.text(0)) | |
| 104 | |
| 105 def __itemActivated(self, itm, column): | |
| 106 """ | |
| 107 Private slot handling the activation of an item. | |
| 108 | |
| 109 @param itm reference to the item (QTreeWidgetItem) | |
| 110 @param column column that was activated (integer) | |
| 111 """ | |
| 112 if itm is None: | |
| 113 return | |
| 114 | |
| 115 if not self.__activating: | |
| 116 self.__activating = True | |
| 117 if itm.parent() is None: | |
| 118 self.__setActive(itm) | |
| 119 else: | |
| 120 self.__setActive(itm.parent()) | |
| 121 self.tableActivated.emit(itm.text(0)) | |
| 122 self.__activating = False | |
| 123 | |
| 124 def __currentItemChanged(self, current, previous): | |
| 125 """ | |
| 126 Private slot handling a change of the current item. | |
| 127 | |
| 128 @param current reference to the new current item (QTreeWidgetItem) | |
| 129 @param previous reference to the previous current item | |
| 130 (QTreeWidgetItem) | |
| 131 """ | |
| 132 self.__schemaAction.setEnabled( | |
| 133 current is not None and current.parent() is not None) | |
| 134 | |
| 135 def __dbCaption(self, db): | |
| 136 """ | |
| 137 Private method to assemble a string for the caption. | |
| 138 | |
| 139 @param db reference to the database object (QSqlDatabase) | |
| 140 @return caption string (string) | |
| 141 """ | |
| 142 nm = db.driverName() | |
| 143 nm += ":" | |
| 144 if db.userName(): | |
| 145 nm += db.userName() | |
| 146 nm += "@" | |
| 147 nm += db.databaseName() | |
| 148 return nm | |
| 149 | |
| 150 def __setBold(self, itm, bold): | |
| 151 """ | |
| 152 Private slot to set the font to bold. | |
| 153 | |
| 154 @param itm reference to the item to be changed (QTreeWidgetItem) | |
| 155 @param bold flag indicating bold (boolean) | |
| 156 """ | |
| 157 font = itm.font(0) | |
| 158 font.setBold(bold) | |
| 159 itm.setFont(0, font) | |
| 160 | |
| 161 def currentDatabase(self): | |
| 162 """ | |
| 163 Public method to get the current database. | |
| 164 | |
| 165 @return reference to the current database (QSqlDatabase) | |
| 166 """ | |
| 167 return QSqlDatabase.database(self.__activeDb) | |
| 168 | |
| 169 def __setActive(self, itm): | |
| 170 """ | |
| 171 Private slot to set an item to active. | |
| 172 | |
| 173 @param itm reference to the item to set as the active item | |
| 174 (QTreeWidgetItem) | |
| 175 """ | |
| 176 for index in range(self.__connectionTree.topLevelItemCount()): | |
| 177 if self.__connectionTree.topLevelItem(index).font(0).bold(): | |
| 178 self.__setBold( | |
| 179 self.__connectionTree.topLevelItem(index), False) | |
| 180 | |
| 181 if itm is None: | |
| 182 return | |
| 183 | |
| 184 self.__setBold(itm, True) | |
| 185 self.__activeDb = QSqlDatabase.connectionNames()[ | |
| 186 self.__connectionTree.indexOfTopLevelItem(itm)] |
