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EditIndexDialog.cpp
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352 lines (301 loc) · 12.5 KB
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#include "EditIndexDialog.h"
#include "ui_EditIndexDialog.h"
#include "sqlitedb.h"
#include "IconCache.h"
#include <QMessageBox>
#include <QPushButton>
EditIndexDialog::EditIndexDialog(DBBrowserDB& db, const sqlb::ObjectIdentifier& indexName, bool createIndex, QWidget* parent)
: QDialog(parent),
pdb(db),
curIndex(indexName),
index(indexName.name()),
newIndex(createIndex),
ui(new Ui::EditIndexDialog),
m_sRestorePointName(pdb.generateSavepointName("editindex"))
{
// Create UI
ui->setupUi(this);
ui->sqlTextEdit->setReadOnly(true);
// Get list of tables, sort it alphabetically and fill the combobox
std::map<std::string, sqlb::ObjectIdentifier> dbobjs; // Map from display name to full object identifier
if(newIndex) // If this is a new index, offer all tables of all database schemata
{
for(const auto& it : pdb.schemata)
{
for(const auto& jt : it.second.tables)
{
// Only show the schema name for non-main schemata
sqlb::ObjectIdentifier obj(it.first, jt.first);
dbobjs.insert({obj.toDisplayString(), obj});
}
}
} else { // If this is an existing index, only offer tables of the current database schema
for(const auto& it : pdb.schemata[curIndex.schema()].tables)
{
// Only show the schema name for non-main schemata
sqlb::ObjectIdentifier obj(curIndex.schema(), it.first);
dbobjs.insert({obj.toDisplayString(), obj});
}
}
ui->comboTableName->blockSignals(true);
for(auto it=dbobjs.cbegin();it!=dbobjs.cend();++it)
ui->comboTableName->addItem(IconCache::get("table"), QString::fromStdString(it->first), QString::fromStdString(it->second.toSerialised()));
ui->comboTableName->blockSignals(false);
QHeaderView *tableHeaderView = ui->tableIndexColumns->horizontalHeader();
tableHeaderView->setSectionResizeMode(0, QHeaderView::Stretch);
// Editing an existing index?
if(!newIndex)
{
// Load the current layout and fill in the dialog fields
index = *pdb.getIndexByName(curIndex);
ui->editIndexName->blockSignals(true);
ui->editIndexName->setText(QString::fromStdString(index.name()));
ui->editIndexName->blockSignals(false);
ui->checkIndexUnique->blockSignals(true);
ui->checkIndexUnique->setChecked(index.unique());
ui->checkIndexUnique->blockSignals(false);
ui->comboTableName->blockSignals(true);
ui->comboTableName->setCurrentText(QString::fromStdString(index.table()));
ui->comboTableName->blockSignals(false);
ui->editPartialClause->blockSignals(true);
ui->editPartialClause->setText(QString::fromStdString(index.whereExpr()));
ui->editPartialClause->blockSignals(false);
tableChanged(QString::fromStdString(index.table()), true);
} else {
tableChanged(ui->comboTableName->currentText(), false);
}
// Add event handler for index column name changes. These are only allowed for expression columns, though.
connect(ui->tableIndexColumns, &QTableWidget::itemChanged, this,
[=](QTableWidgetItem* item)
{
index.fields[static_cast<size_t>(item->row())].setName(item->text().toStdString());
updateSqlText();
});
// Create a savepoint to revert back to
pdb.setSavepoint(m_sRestorePointName);
}
EditIndexDialog::~EditIndexDialog()
{
delete ui;
}
void EditIndexDialog::tableChanged(int table_name_idx) {
tableChanged(ui->comboTableName->itemText(table_name_idx), false);
}
void EditIndexDialog::tableChanged(const QString& new_table, bool initialLoad)
{
// Set the table name and clear all index columns
if(!initialLoad)
{
index.setTable(sqlb::ObjectIdentifier(ui->comboTableName->currentData().toString().toStdString()).name());
index.fields.clear();
}
// Stop here if table name is empty
if(new_table.isEmpty())
{
// Call checkInput() before to make sure the OK button is disabled
checkInput();
return;
}
updateColumnLists();
}
void EditIndexDialog::updateColumnLists()
{
// Fill the table column list
sqlb::TablePtr table = pdb.getTableByName(sqlb::ObjectIdentifier(ui->comboTableName->currentData().toString().toStdString()));
if(!table)
return;
ui->tableTableColumns->setRowCount(static_cast<int>(table->fields.size()));
int tableRows = 0;
for(const auto& field: table->fields)
{
// When we're doing the initial loading and this field already is in the index to edit, then don't add it to the
// list of table columns. It will be added to the list of index columns in the next step. When this is not the initial
// loading, the index column list is empty, so this check will always be true.
if(sqlb::findField(index, field.name()) == index.fields.end())
{
// Put the name of the field in the first column
QTableWidgetItem* name = new QTableWidgetItem(QString::fromStdString(field.name()));
name->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);
ui->tableTableColumns->setItem(tableRows, 0, name);
// Put the data type in the second column
QTableWidgetItem* type = new QTableWidgetItem(QString::fromStdString(field.type()));
type->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);
ui->tableTableColumns->setItem(tableRows, 1, type);
tableRows++;
}
}
// Set row count to actual count. This is needed for the initial loading, when some rows might have been omitted because they were used in the index
ui->tableTableColumns->setRowCount(tableRows);
// Fill the index column list. This is done separately from the table column to include expression columns (these are not found in the original
// table) and to preserve the order of the index columns
auto indexFields = index.fields;
ui->tableIndexColumns->blockSignals(true);
ui->tableIndexColumns->setRowCount(static_cast<int>(indexFields.size()));
for(size_t i=0;i<indexFields.size();++i)
{
// Put the name of the field in the first column
QTableWidgetItem* name = new QTableWidgetItem(QString::fromStdString(indexFields.at(i).name()));
Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsEnabled;
if(indexFields.at(i).expression())
flags |= Qt::ItemIsEditable;
name->setFlags(flags);
ui->tableIndexColumns->setItem(static_cast<int>(i), 0, name);
// And put a combobox to select the order in which to index the field in the last column
QComboBox* order = new QComboBox(this);
order->addItem("");
order->addItem("ASC");
order->addItem("DESC");
order->setCurrentText(QString::fromStdString(indexFields.at(i).order()).toUpper());
ui->tableIndexColumns->setCellWidget(static_cast<int>(i), 1, order);
connect(order, &QComboBox::currentTextChanged, this,
[=](QString new_order)
{
auto colnum = sqlb::findField(index, indexFields.at(i).name());
if(colnum != index.fields.end())
{
colnum->setOrder(new_order.toStdString());
updateSqlText();
}
});
}
ui->tableIndexColumns->blockSignals(false);
checkInput();
}
void EditIndexDialog::addToIndex(const QModelIndex& idx)
{
// Get current row number
int row;
if(idx.isValid())
row = idx.row();
else
row = ui->tableTableColumns->currentRow();
// No row selected? Abort.
if(row == -1)
return;
// Add field to index
index.fields.emplace_back(
ui->tableTableColumns->item(row, 0)->text().toStdString(), // Column name
false, // Is expression
""); // Order
// Update UI
updateColumnLists();
}
void EditIndexDialog::removeFromIndex(const QModelIndex& idx)
{
// Get current row number
int row;
if(idx.isValid())
row = idx.row();
else
row = ui->tableIndexColumns->currentRow();
// No row selected? Abort.
if(row == -1)
return;
// If this is an expression column and the action was triggered by a double click event instead of a button click,
// we won't remove the expression column because it's too likely that this was only done by accident by the user.
// Instead just open the expression column for editing.
if(index.fields[static_cast<size_t>(row)].expression() && sender() != ui->buttonFromIndex)
{
ui->tableIndexColumns->editItem(ui->tableIndexColumns->item(row, 0));
return;
}
// Remove column from index
sqlb::removeField(index, ui->tableIndexColumns->item(row, 0)->text().toStdString());
// Update UI
updateColumnLists();
}
void EditIndexDialog::checkInput()
{
// Check if index name is set
bool valid = true;
if(ui->editIndexName->text().isEmpty())
valid = false;
// Check if a table is selected (this is especially important in the case where there are no tables in the database yet).
if(ui->comboTableName->currentText().isNull())
valid = false;
// Check if index has any columns
if(index.fields.size() == 0)
valid = false;
// Only activate OK button if index data is valid
ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(valid);
// Set the index name and the unique flag
index.setName(ui->editIndexName->text().toStdString());
index.setUnique(ui->checkIndexUnique->isChecked());
index.setWhereExpr(ui->editPartialClause->text().toStdString());
updateSqlText();
}
void EditIndexDialog::accept()
{
// When editing an index, delete the old one first
if(!newIndex)
{
if(!pdb.executeSQL("DROP INDEX IF EXISTS " + curIndex.toString()))
{
QMessageBox::warning(this, qApp->applicationName(), tr("Deleting the old index failed:\n%1").arg(pdb.lastError()));
return;
}
}
// Create the new index in the schema of the selected table
if(pdb.executeSQL(index.sql(sqlb::ObjectIdentifier(ui->comboTableName->currentData().toString().toStdString()).schema())))
QDialog::accept();
else
QMessageBox::warning(this, QApplication::applicationName(), tr("Creating the index failed:\n%1").arg(pdb.lastError()));
}
void EditIndexDialog::reject()
{
// Rollback to our savepoint
pdb.revertToSavepoint(m_sRestorePointName);
QDialog::reject();
}
void EditIndexDialog::updateSqlText()
{
ui->sqlTextEdit->setText(QString::fromStdString(index.sql(sqlb::ObjectIdentifier(ui->comboTableName->currentData().toString().toStdString()).schema())));
}
void EditIndexDialog::moveColumnUp()
{
moveCurrentColumn(false);
}
void EditIndexDialog::moveColumnDown()
{
moveCurrentColumn(true);
}
void EditIndexDialog::moveCurrentColumn(bool down)
{
// Get current row number and calculate row number after the movement. Check the values
int currentRow = ui->tableIndexColumns->currentRow();
if(currentRow == -1)
return;
int newRow = currentRow + (down ? 1 : -1);
if(newRow < 0)
return;
if(newRow >= ui->tableIndexColumns->rowCount())
return;
// Swap the columns
std::swap(index.fields[static_cast<size_t>(currentRow)], index.fields[static_cast<size_t>(newRow)]);
// Update UI
updateColumnLists();
// Select old row at new position
ui->tableIndexColumns->selectRow(newRow);
}
void EditIndexDialog::addExpressionColumn()
{
// Check if there already is an empty expression column
auto field_it = sqlb::findField(index, "");
int row = static_cast<int>(std::distance(index.fields.begin(), field_it));
if(field_it == index.fields.end())
{
// There is no empty expression column yet, so add one.
// Add new expression column to the index
index.fields.emplace_back(
"", // Column name
true, // Is expression
""); // Order
// Update UI
updateColumnLists();
// Get row number of new column
row = ui->tableIndexColumns->rowCount() - 1;
}
// Now we should have the row number of the empty expression column, no matter if it was newly added or it already existed.
// Select the row for editing
ui->tableIndexColumns->editItem(ui->tableIndexColumns->item(row, 0));
}
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