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398 lines (336 loc) · 15.7 KB
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#include "DbStructureModel.h"
#include "IconCache.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),
browsablesRootItem(nullptr),
m_dropQualifiedNames(false),
m_dropEnquotedNames(false)
{
// 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);
}
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 browsable 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 QString::fromStdString(sqlb::ObjectIdentifier(item->text(ColumnSchema).toStdString(), item->text(ColumnName).toStdString()).toDisplayString());
else
return Settings::getValue("db", "hideschemalinebreaks").toBool() ? item->text(index.column()).simplified() : item->text(index.column());
case Qt::EditRole:
return item->text(index.column());
case Qt::ToolTipRole: {
// Show the original text but limited, when it's supposed to be shown in a tooltip
QString text = item->text(index.column());
if (text.length() > 512) {
text.truncate(509);
text.append("...");
}
return text;
}
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 SQLite objects and for fields (composition in SQL text editor).
// Grouping nodes have no type.
QString type = data(index.sibling(index.row(), ColumnObjectType), Qt::DisplayRole).toString();
if(!type.isEmpty())
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();
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 all browsable objects, i.e. views and tables.
// The second 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, IconCache::get("view"));
browsablesRootItem->setText(ColumnName, tr("Browsables"));
// Make sure to always load the main schema first
QTreeWidgetItem* itemAll = new QTreeWidgetItem(rootItem);
itemAll->setIcon(ColumnName, IconCache::get("database"));
itemAll->setText(ColumnName, tr("All"));
itemAll->setText(ColumnObjectType, "database");
itemAll->setText(ColumnSchema, "main");
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"].empty())
{
QTreeWidgetItem* itemTemp = new QTreeWidgetItem(itemAll);
itemTemp->setIcon(ColumnName, IconCache::get("database"));
itemTemp->setText(ColumnName, tr("Temporary"));
itemTemp->setText(ColumnObjectType, "database");
itemTemp->setText(ColumnSchema, "temp");
buildTree(itemTemp, "temp");
}
// Now load all the other schemata last
for(const auto& it : m_db.schemata)
{
// Don't load the main and temp schema again
if(it.first != "main" && it.first != "temp")
{
QTreeWidgetItem* itemSchema = new QTreeWidgetItem(itemAll);
itemSchema->setIcon(ColumnName, IconCache::get("database"));
itemSchema->setText(ColumnName, QString::fromStdString(it.first));
itemSchema->setText(ColumnObjectType, "database");
itemSchema->setText(ColumnSchema, QString::fromStdString(it.first));
buildTree(itemSchema, it.first);
}
}
// Refresh the view
endResetModel();
}
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)
{
// Get the item the index points at
QTreeWidgetItem* item = static_cast<QTreeWidgetItem*>(index.internalPointer());
// Only export data for valid indices and only once per row (SQL column or Name column).
if(index.isValid()) {
QString objectType = data(index.sibling(index.row(), ColumnObjectType), Qt::DisplayRole).toString();
// For names, export a (qualified) (escaped) identifier of the item for statement composition in SQL editor.
if(objectType == "field")
namesData.append(getNameForDropping(item->text(ColumnSchema), item->parent()->text(ColumnName), item->text(ColumnName)).toUtf8());
else if(objectType == "database")
namesData.append(getNameForDropping(item->text(ColumnName), "", "").toUtf8());
else if(!objectType.isEmpty())
namesData.append(getNameForDropping(item->text(ColumnSchema), item->text(ColumnName), "").toUtf8());
if(objectType != "field" && index.column() == ColumnSQL)
{
// Add the SQL code used to create the object
sqlData.append(data(index, Qt::DisplayRole).toByteArray() + ";\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().toStdString(),
data(index.sibling(index.row(), ColumnName), Qt::DisplayRole).toString().toStdString());
tableModel.setQuery(sqlb::Query(objid));
if(tableModel.completeCache())
{
// Only continue if all data was fetched
for(int i=0; i < tableModel.rowCount(); ++i)
{
QString insertStatement = "INSERT INTO " + QString::fromStdString(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.toUtf8());
}
}
}
}
}
}
// 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 ", " or "."
if (namesData.endsWith(", "))
namesData.chop(2);
else if (namesData.endsWith("."))
namesData.chop(1);
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 std::string& schema)
{
// Get object map for the given schema
const objectMap& objmap = m_db.schemata.at(schema);
// Prepare tree
auto num_tables = std::count_if(objmap.tables.begin(), objmap.tables.end(), [](const auto& t) { return !t.second->isView(); });
QTreeWidgetItem* itemTables = new QTreeWidgetItem(parent);
itemTables->setIcon(ColumnName, IconCache::get("table"));
itemTables->setText(ColumnName, tr("Tables (%1)").arg(num_tables));
QTreeWidgetItem* itemIndices = new QTreeWidgetItem(parent);
itemIndices->setIcon(ColumnName, IconCache::get("index"));
itemIndices->setText(ColumnName, tr("Indices (%1)").arg(objmap.indices.size()));
auto num_views = std::count_if(objmap.tables.begin(), objmap.tables.end(), [](const auto& t) { return t.second->isView(); });
QTreeWidgetItem* itemViews = new QTreeWidgetItem(parent);
itemViews->setIcon(ColumnName, IconCache::get("view"));
itemViews->setText(ColumnName, tr("Views (%1)").arg(num_views));
QTreeWidgetItem* itemTriggers = new QTreeWidgetItem(parent);
itemTriggers->setIcon(ColumnName, IconCache::get("trigger"));
itemTriggers->setText(ColumnName, tr("Triggers (%1)").arg(objmap.triggers.size()));
// Add tables and views
for(const auto& obj : objmap.tables)
{
QTreeWidgetItem* item = addNode(schema, obj.second->name(), obj.second->isView() ? "view" : "table", obj.second->originalSql(), obj.second->isView() ? itemViews : itemTables);
// Add an extra node for the browsable section
addNode(schema, obj.second->name(), obj.second->isView() ? "view" : "table", obj.second->originalSql(), browsablesRootItem);
sqlb::StringVector pk_columns;
if(!obj.second->isView())
{
const auto pk = obj.second->primaryKey();
if(pk)
pk_columns = pk->columnList();
}
for(const auto& field : obj.second->fields)
{
bool isPK = contains(pk_columns, field.name());
bool isFK = obj.second->constraint({field.name()}, sqlb::Constraint::ForeignKeyConstraintType) != nullptr;
addNode(schema, field.name(), "field", field.toString(" ", " "), item, field.type(), isPK ? "_key" : (isFK ? "_fk" : std::string{}));
}
}
// Add indices
for(const auto& obj : objmap.indices)
{
QTreeWidgetItem* item = addNode(schema, obj.second->name(), "index", obj.second->originalSql(), itemIndices);
for(const auto& field : obj.second->fields)
addNode(schema, field.name(), "field", field.toString(" ", " "), item, field.order());
}
// Add triggers
for(const auto& obj : objmap.triggers)
addNode(schema, obj.second->name(), "trigger", obj.second->originalSql(), itemTriggers);
}
QTreeWidgetItem* DbStructureModel::addNode(const std::string& schema, const std::string& name, const std::string& object_type, const std::string& sql, QTreeWidgetItem* parent_item, const std::string& data_type, const std::string& icon_suffix)
{
QTreeWidgetItem* item = new QTreeWidgetItem(parent_item);
item->setText(ColumnName, QString::fromStdString(name));
item->setText(ColumnObjectType, QString::fromStdString(object_type));
item->setText(ColumnDataType, QString::fromStdString(data_type));
item->setText(ColumnSQL, QString::fromStdString(sql));
item->setText(ColumnSchema, QString::fromStdString(schema));
item->setIcon(ColumnName, IconCache::get(object_type + icon_suffix));
return item;
}
QString DbStructureModel::getNameForDropping(const QString& domain, const QString& object, const QString& field) const
{
// Take into account the drag&drop options for composing a name. Commas are included for composing a
// list of fields. A dot is added after other items, in order to allow composing a fully qualified name
// by selecting together and dropping a parent item and a child (e.g. select with control an attached
// database and a table, and drag and drop them to get "schema1"."table1".) Note that this only makes
// sense when the "Drop Qualified Names" option is not set.
QString name;
if ((domain != "main" && m_dropQualifiedNames) || object.isEmpty())
name = m_dropEnquotedNames ? sqlb::escapeIdentifier(domain) + "." : domain + ".";
if (!object.isEmpty() && (m_dropQualifiedNames || field.isEmpty()))
name += m_dropEnquotedNames ? sqlb::escapeIdentifier(object) + "." : object + ".";
if (!field.isEmpty())
name += m_dropEnquotedNames ? sqlb::escapeIdentifier(field) + ", " : field + ", ";
return name;
}
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