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Copy pathDbStructureModel.cpp
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364 lines (308 loc) · 13.7 KB
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#include "DbStructureModel.h"
#include "sqlitedb.h"
#include "sqlitetablemodel.h"
#include "Settings.h"
#include <QTreeWidgetItem>
#include <QMimeData>
#include <QMessageBox>
#include <QApplication>
DbStructureModel::DbStructureModel(DBBrowserDB& db, QObject* parent)
: QAbstractItemModel(parent),
m_db(db)
{
// Create root item and use its columns to store the header strings
QStringList header;
header << tr("Name") << tr("Object") << tr("Type") << tr("Schema") << tr("Database");
rootItem = new QTreeWidgetItem(header);
browsablesRootItem = nullptr;
}
DbStructureModel::~DbStructureModel()
{
delete rootItem;
}
int DbStructureModel::columnCount(const QModelIndex&) const
{
return rootItem->columnCount();
}
QVariant DbStructureModel::data(const QModelIndex& index, int role) const
{
if(!index.isValid())
return QVariant();
// Get the item the index points at
QTreeWidgetItem* item = static_cast<QTreeWidgetItem*>(index.internalPointer());
// Depending on the role either return the text or the icon
switch(role)
{
case Qt::DisplayRole:
// For the display role and the browsabled branch of the tree we want to show the column name including the schema name if necessary (i.e.
// for schemata != "main"). For the normal structure branch of the tree we don't want to add the schema name because it's already obvious from
// the position of the item in the tree.
if(index.column() == ColumnName && item->parent() == browsablesRootItem)
return sqlb::ObjectIdentifier(item->text(ColumnSchema), item->text(ColumnName)).toDisplayString();
else
return Settings::getValue("db", "hideschemalinebreaks").toBool() ? item->text(index.column()).replace("\n", " ").simplified() : item->text(index.column());
case Qt::EditRole:
case Qt::ToolTipRole: // Don't modify the text when it's supposed to be shown in a tooltip
return item->text(index.column());
case Qt::DecorationRole:
return item->icon(index.column());
default:
return QVariant();
}
}
Qt::ItemFlags DbStructureModel::flags(const QModelIndex &index) const
{
if(!index.isValid())
return Qt::ItemIsDropEnabled;
// All items are enabled and selectable
Qt::ItemFlags flags = Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsDropEnabled;
// Only enable dragging for entire table objects and for fields (composition in SQL text editor)
QString type = data(index.sibling(index.row(), ColumnObjectType), Qt::DisplayRole).toString();
if(type == "table" || type == "field" || type == "view" || type == "index" || type == "trigger")
flags |= Qt::ItemIsDragEnabled;
return flags;
}
QVariant DbStructureModel::headerData(int section, Qt::Orientation orientation, int role) const
{
// Get the header string from the root item
if(orientation == Qt::Horizontal && role == Qt::DisplayRole)
return rootItem->data(section, role);
return QVariant();
}
QModelIndex DbStructureModel::index(int row, int column, const QModelIndex& parent) const
{
if(!hasIndex(row, column, parent))
return QModelIndex();
QTreeWidgetItem *parentItem;
if(!parent.isValid())
parentItem = rootItem;
else
parentItem = static_cast<QTreeWidgetItem*>(parent.internalPointer());
QTreeWidgetItem* childItem = parentItem->child(row);
if(childItem)
return createIndex(row, column, childItem);
else
return QModelIndex();
}
QModelIndex DbStructureModel::parent(const QModelIndex& index) const
{
if(!index.isValid())
return QModelIndex();
QTreeWidgetItem* childItem = static_cast<QTreeWidgetItem*>(index.internalPointer());
QTreeWidgetItem* parentItem = childItem->parent();
if(parentItem == rootItem)
return QModelIndex();
else
return createIndex(0, 0, parentItem);
}
int DbStructureModel::rowCount(const QModelIndex& parent) const
{
if(parent.column() > 0)
return 0;
if(!parent.isValid())
return rootItem->childCount();
else
return static_cast<QTreeWidgetItem*>(parent.internalPointer())->childCount();
}
void DbStructureModel::reloadData()
{
beginResetModel();
// Remove all data except for the root item
while(rootItem->childCount())
delete rootItem->child(0);
// Return here if no DB is opened
if(!m_db.isOpen())
{
endResetModel();
emit structureUpdated();
return;
}
// Create the nodes for browsables and for tables, indices, views and triggers. The idea here is to basically have two trees in one model:
// In the root node there are two nodes: 'browsables' and 'all'. The first node contains a list of a all browsable objects, i.e. views and tables.
// The seconds node contains four sub-nodes (tables, indices, views and triggers), each containing a list of objects of that type.
// This way we only have to have and only have to update one model and can use it in all sorts of places, just by setting a different root node.
browsablesRootItem = new QTreeWidgetItem(rootItem);
browsablesRootItem->setIcon(ColumnName, QIcon(QString(":/icons/view")));
browsablesRootItem->setText(ColumnName, tr("Browsables"));
// Make sure to always load the main schema first
QTreeWidgetItem* itemAll = new QTreeWidgetItem(rootItem);
itemAll->setIcon(ColumnName, QIcon(QString(":/icons/database")));
itemAll->setText(ColumnName, tr("All"));
buildTree(itemAll, "main");
// Add the temporary database as a node if it isn't empty. Make sure it's always second if it exists.
if(!m_db.schemata["temp"].isEmpty())
{
QTreeWidgetItem* itemTemp = new QTreeWidgetItem(itemAll);
itemTemp->setIcon(ColumnName, QIcon(QString(":/icons/database")));
itemTemp->setText(ColumnName, tr("Temporary"));
buildTree(itemTemp, "temp");
}
// Now load all the other schemata last
for(auto it=m_db.schemata.constBegin();it!=m_db.schemata.constEnd();++it)
{
// Don't load the main and temp schema again
if(it.key() != "main" && it.key() != "temp")
{
QTreeWidgetItem* itemSchema = new QTreeWidgetItem(itemAll);
itemSchema->setIcon(ColumnName, QIcon(QString(":/icons/database")));
itemSchema->setText(ColumnName, it.key());
buildTree(itemSchema, it.key());
}
}
// Refresh the view
endResetModel();
emit structureUpdated();
}
QStringList DbStructureModel::mimeTypes() const
{
QStringList types;
types << "text/plain";
return types;
}
QMimeData* DbStructureModel::mimeData(const QModelIndexList& indices) const
{
// We store the SQL data and the names data separately
QByteArray sqlData, namesData;
// Loop through selected indices
for(const QModelIndex& index : indices)
{
// Only export data for valid indices and only once per row (SQL column or Name column).
// For names, export an escaped identifier of the item for statement composition in SQL editor.
// Commas are included for a list of identifiers.
if(index.isValid()) {
QString objectType = data(index.sibling(index.row(), ColumnObjectType), Qt::DisplayRole).toString();
if(index.column() == ColumnName)
namesData.append(sqlb::escapeIdentifier(data(index, Qt::DisplayRole).toString()) + ", ");
if(objectType != "field" && index.column() == ColumnSQL)
{
// Add the SQL code used to create the object
sqlData.append(data(index, Qt::DisplayRole).toString() + ";\n");
// If it is a table also add the content
if(objectType == "table")
{
SqliteTableModel tableModel(m_db);
sqlb::ObjectIdentifier objid(data(index.sibling(index.row(), ColumnSchema), Qt::DisplayRole).toString(),
data(index.sibling(index.row(), ColumnName), Qt::DisplayRole).toString());
tableModel.setTable(objid);
if(tableModel.completeCache())
{
// Only continue if all data was fetched
for(int i=0; i < tableModel.rowCount(); ++i)
{
QString insertStatement = "INSERT INTO " + objid.toString() + " VALUES(";
for(int j=1; j < tableModel.columnCount(); ++j)
insertStatement += QString("'%1',").arg(tableModel.data(tableModel.index(i, j), Qt::EditRole).toString());
insertStatement.chop(1);
insertStatement += ");\n";
sqlData.append(insertStatement);
}
}
}
}
}
}
// Create the MIME data object
QMimeData* mime = new QMimeData();
mime->setProperty("db_file", m_db.currentFile()); // Also save the file name to avoid dropping an object on the same database as it comes from
// When we have both SQL and Names data (probable row selection mode) we give precedence to the SQL data
if (sqlData.length() == 0 && namesData.length() > 0) {
// Remove last ", "
namesData.chop(2);
mime->setData("text/plain", namesData);
} else
mime->setData("text/plain", sqlData);
return mime;
}
bool DbStructureModel::dropMimeData(const QMimeData* data, Qt::DropAction action, int, int, const QModelIndex&)
{
if(action == Qt::IgnoreAction)
return true;
if(!data->hasFormat("text/plain"))
return false;
if(data->property("db_file") == m_db.currentFile())
return false;
// Get data
QByteArray d = data->data("text/plain");
// Try to execute the SQL statement
if(m_db.executeMultiSQL(d, true, true))
{
m_db.updateSchema();
return true;
} else {
QMessageBox::warning(nullptr, QApplication::applicationName(), m_db.lastError());
return false;
}
}
void DbStructureModel::buildTree(QTreeWidgetItem* parent, const QString& schema)
{
// Build a map from object type to tree node to simplify finding the correct tree node later
QMap<QString, QTreeWidgetItem*> typeToParentItem;
// Get object map for the given schema
objectMap objmap = m_db.schemata[schema];
// Prepare tree
QTreeWidgetItem* itemTables = new QTreeWidgetItem(parent);
itemTables->setIcon(ColumnName, QIcon(QString(":/icons/table")));
itemTables->setText(ColumnName, tr("Tables (%1)").arg(objmap.values("table").count()));
typeToParentItem.insert("table", itemTables);
QTreeWidgetItem* itemIndices = new QTreeWidgetItem(parent);
itemIndices->setIcon(ColumnName, QIcon(QString(":/icons/index")));
itemIndices->setText(ColumnName, tr("Indices (%1)").arg(objmap.values("index").count()));
typeToParentItem.insert("index", itemIndices);
QTreeWidgetItem* itemViews = new QTreeWidgetItem(parent);
itemViews->setIcon(ColumnName, QIcon(QString(":/icons/view")));
itemViews->setText(ColumnName, tr("Views (%1)").arg(objmap.values("view").count()));
typeToParentItem.insert("view", itemViews);
QTreeWidgetItem* itemTriggers = new QTreeWidgetItem(parent);
itemTriggers->setIcon(ColumnName, QIcon(QString(":/icons/trigger")));
itemTriggers->setText(ColumnName, tr("Triggers (%1)").arg(objmap.values("trigger").count()));
typeToParentItem.insert("trigger", itemTriggers);
// Get all database objects and sort them by their name
QMultiMap<QString, sqlb::ObjectPtr> dbobjs;
for(auto it : objmap)
dbobjs.insert(it->name(), it);
// Add the database objects to the tree nodes
for(auto it : dbobjs)
{
// Object node
QTreeWidgetItem* item = addNode(typeToParentItem.value(sqlb::Object::typeToString(it->type())), it, schema);
// If it is a table or view add the field nodes, add an extra node for the browsable section
if(it->type() == sqlb::Object::Types::Table || it->type() == sqlb::Object::Types::View)
addNode(browsablesRootItem, it, schema);
// Add field nodes if there are any
sqlb::FieldInfoList fieldList = it->fieldInformation();
if(!fieldList.empty())
{
QStringList pk_columns;
if(it->type() == sqlb::Object::Types::Table)
{
sqlb::FieldVector pk = it.dynamicCast<sqlb::Table>()->primaryKey();
for(const sqlb::FieldPtr& pk_col : pk)
pk_columns.push_back(pk_col->name());
}
for(const sqlb::FieldInfo& field : fieldList)
{
QTreeWidgetItem *fldItem = new QTreeWidgetItem(item);
fldItem->setText(ColumnName, field.name);
fldItem->setText(ColumnObjectType, "field");
fldItem->setText(ColumnDataType, field.type);
fldItem->setText(ColumnSQL, field.sql);
fldItem->setText(ColumnSchema, schema);
if(pk_columns.contains(field.name))
fldItem->setIcon(ColumnName, QIcon(":/icons/field_key"));
else
fldItem->setIcon(ColumnName, QIcon(":/icons/field"));
}
}
}
}
QTreeWidgetItem* DbStructureModel::addNode(QTreeWidgetItem* parent, const sqlb::ObjectPtr& object, const QString& schema)
{
QString type = sqlb::Object::typeToString(object->type());
QTreeWidgetItem *item = new QTreeWidgetItem(parent);
item->setIcon(ColumnName, QIcon(QString(":/icons/%1").arg(type)));
item->setText(ColumnName, object->name());
item->setText(ColumnObjectType, type);
item->setText(ColumnSQL, object->originalSql());
item->setText(ColumnSchema, schema);
return item;
}
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