sqlitebrowser/src/DbStructureModel.cpp at master · PeterDaveHello/sqlitebrowser · GitHub

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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),

m_dropSelectQuery(true)

{

// 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;

// For dropping SELECT queries, these variables take account of

// whether all objects are of the same type and belong to the same table.

QString objectTypeSet;

QString tableSet;

// 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();

if (objectTypeSet.isEmpty() || objectTypeSet == objectType) {

objectTypeSet = objectType;

} else {

objectTypeSet = "*";

}

// 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());

QString table = getNameForDropping(item->text(ColumnSchema), item->parent()->text(ColumnName), "");

if (tableSet.isEmpty() || tableSet == table) {

tableSet = table;

} else {

tableSet = "*";

}

} else if(objectType == "table") {

QString table = getNameForDropping(item->text(ColumnSchema), item->text(ColumnName), "");

namesData.append(table.toUtf8());

if (tableSet.isEmpty() || tableSet == table) {

tableSet = table;

} else {

tableSet = "*";

}

} else if(objectType == "database") {

tableSet = "";

namesData.append(getNameForDropping(item->text(ColumnName), "", "").toUtf8());

} else if(!objectType.isEmpty()) {

tableSet = "";

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);

if (tableSet.endsWith("."))

tableSet.chop(1);

if (m_dropSelectQuery && !tableSet.isEmpty() && tableSet != "*" && !objectTypeSet.isEmpty()) {

if (objectTypeSet == "field") {

namesData = ("SELECT " + QString::fromUtf8(namesData) + " FROM " + tableSet + ";").toUtf8();

} else if (objectTypeSet == "table") {

namesData = ("SELECT * FROM " + tableSet + ";").toUtf8();

}

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::IndexedColumnVector pk_columns;

if(!obj.second->isView())

{

const auto pk = obj.second->primaryKey();

if(pk)

pk_columns = obj.second->primaryKeyColumns();

}

for(const auto& field : obj.second->fields)

{

bool isPK = contains(pk_columns, field.name());

bool isFK = obj.second->foreignKey({field.name()}) != 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;

}

sqlitebrowser/src/DbStructureModel.cpp at master · PeterDaveHello/sqlitebrowser · GitHub

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