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934 lines (813 loc) · 31.3 KB
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#include "sqlitetablemodel.h"
#include "sqlitedb.h"
#include "sqlite.h"
#include "Settings.h"
#include <QDebug>
#include <QMessageBox>
#include <QApplication>
#include <QTextCodec>
#include <QMimeData>
#include <QFile>
#include <QUrl>
#include <QtConcurrent/QtConcurrentRun>
SqliteTableModel::SqliteTableModel(DBBrowserDB& db, QObject* parent, size_t chunkSize, const QString& encoding)
: QAbstractTableModel(parent)
, m_db(db)
, m_rowCountAdjustment(0)
, m_chunkSize(chunkSize)
, m_encoding(encoding)
{
reset();
}
void SqliteTableModel::reset()
{
m_futureFetch.cancel();
m_futureFetch.waitForFinished();
m_rowCount = QtConcurrent::run([=]() {
// Make sure we report 0 rows if anybody asks
return 0;
});
m_rowCountAdjustment = 0;
m_sTable.clear();
m_sRowidColumn.clear();
m_iSortColumn = 0;
m_sSortOrder = "ASC";
m_headers.clear();
m_mWhere.clear();
m_vDataTypes.clear();
m_vDisplayFormat.clear();
m_pseudoPk.clear();
}
void SqliteTableModel::setChunkSize(size_t chunksize)
{
m_chunkSize = chunksize;
}
void SqliteTableModel::setTable(const sqlb::ObjectIdentifier& table, int sortColumn, Qt::SortOrder sortOrder, const QVector<QString>& display_format)
{
// Unset all previous settings. When setting a table all information on the previously browsed data set is removed first.
reset();
// Save the other parameters
m_sTable = table;
m_vDisplayFormat = display_format;
// The first column is the rowid column and therefore is always of type integer
m_vDataTypes.push_back(SQLITE_INTEGER);
// Get the data types of all other columns as well as the column names
bool allOk = false;
if(m_db.getObjectByName(table)->type() == sqlb::Object::Types::Table)
{
sqlb::TablePtr t = m_db.getObjectByName(table).dynamicCast<sqlb::Table>();
if(t && t->fields().size()) // parsing was OK
{
m_sRowidColumn = t->rowidColumn();
m_headers.push_back(m_sRowidColumn);
m_headers.append(t->fieldNames());
// parse columns types
static QStringList dataTypes = QStringList()
<< "INTEGER"
<< "REAL"
<< "TEXT"
<< "BLOB";
for(const sqlb::FieldPtr& fld : t->fields())
{
QString name(fld->type().toUpper());
int colType = dataTypes.indexOf(name);
colType = (colType == -1) ? SQLITE_TEXT : colType + 1;
m_vDataTypes.push_back(colType);
}
allOk = true;
}
}
// If for one reason or another (either it's a view or we couldn't parse the table statement) we couldn't get the field
// information we retrieve it from SQLite using an extra query.
// NOTE: It would be nice to eventually get rid of this piece here. As soon as the grammar parser is good enough...
if(!allOk)
{
QString sColumnQuery = QString::fromUtf8("SELECT * FROM %1;").arg(table.toString());
m_sRowidColumn = "rowid";
m_headers.push_back("rowid");
m_headers.append(getColumns(sColumnQuery, m_vDataTypes));
}
// Set sort parameters. We're setting the sort column to an invalid value before calling sort() because this way, in sort() the
// current sort order is always changed and thus buildQuery() is always going to be called.
// This is also why we don't need to call buildQuery() here again.
m_iSortColumn = -1;
sort(sortColumn, sortOrder);
}
namespace {
QString rtrimChar(const QString& s, QChar c) {
QString r = s.trimmed();
while(r.endsWith(c))
r.chop(1);
return r;
}
}
void SqliteTableModel::setQuery(const QString& sQuery, bool dontClearHeaders)
{
// clear
if(!dontClearHeaders)
reset();
if(!m_db.isOpen())
return;
m_sQuery = sQuery.trimmed();
removeCommentsFromQuery(m_sQuery);
// do a count query to get the full row count in a fast manner
m_rowCountAdjustment = 0;
m_rowCount = QtConcurrent::run([=]() {
return getQueryRowCount();
});
// headers
if(!dontClearHeaders)
{
m_headers.append(getColumns(sQuery, m_vDataTypes));
}
// now fetch the first entries
clearCache();
fetchData(0, m_chunkSize);
emit layoutChanged();
}
int SqliteTableModel::getQueryRowCount()
{
// Return -1 if there is an error
int retval = -1;
// Use a different approach of determining the row count when a EXPLAIN or a PRAGMA statement is used because a COUNT fails on these queries
if(m_sQuery.startsWith("EXPLAIN", Qt::CaseInsensitive) || m_sQuery.startsWith("PRAGMA", Qt::CaseInsensitive))
{
// So just execute the statement as it is and fetch all results counting the rows
sqlite3_stmt* stmt;
QByteArray utf8Query = m_sQuery.toUtf8();
if(sqlite3_prepare_v2(m_db._db, utf8Query, utf8Query.size(), &stmt, NULL) == SQLITE_OK)
{
retval = 0;
while(sqlite3_step(stmt) == SQLITE_ROW)
retval++;
sqlite3_finalize(stmt);
// Return the results but also set the chunk size the number of rows to prevent the lazy population mechanism to kick in as using LIMIT
// fails on this kind of queries as well
m_chunkSize = retval;
return retval;
}
} else {
// If it is a normal query - hopefully starting with SELECT - just do a COUNT on it and return the results
QString sCountQuery = QString("SELECT COUNT(*) FROM (%1);").arg(rtrimChar(m_sQuery, ';'));
m_db.logSQL(sCountQuery, kLogMsg_App);
QByteArray utf8Query = sCountQuery.toUtf8();
sqlite3_stmt* stmt;
int status = sqlite3_prepare_v2(m_db._db, utf8Query, utf8Query.size(), &stmt, NULL);
if(status == SQLITE_OK)
{
status = sqlite3_step(stmt);
if(status == SQLITE_ROW)
{
QString sCount = QString::fromUtf8((const char*)sqlite3_column_text(stmt, 0));
retval = sCount.toInt();
}
sqlite3_finalize(stmt);
} else {
qWarning() << "Count query failed: " << sCountQuery;
}
}
return retval;
}
int SqliteTableModel::rowCount(const QModelIndex&) const
{
return m_data.size(); // current fetched row count
}
int SqliteTableModel::totalRowCount() const
{
return m_rowCount + m_rowCountAdjustment;
}
int SqliteTableModel::columnCount(const QModelIndex&) const
{
return m_headers.size();
}
QVariant SqliteTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
if (role != Qt::DisplayRole)
return QVariant();
if (orientation == Qt::Horizontal)
{
// if we have a VIRTUAL table the model will not be valid, with no header data
if(section < m_headers.size())
return m_headers.at(section);
return QString("%1").arg(section + 1);
}
else
return QString("%1").arg(section + 1);
}
QVariant SqliteTableModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid())
return QVariant();
if (index.row() >= (m_rowCount + m_rowCountAdjustment))
return QVariant();
QMutexLocker lock(&m_mutexDataCache);
if(role == Qt::DisplayRole || role == Qt::EditRole)
{
// If this row is not in the cache yet get it first
while(index.row() >= m_data.size() && canFetchMore())
const_cast<SqliteTableModel*>(this)->fetchMore(); // Nothing evil to see here, move along
if(role == Qt::DisplayRole && m_data.at(index.row()).at(index.column()).isNull())
{
return Settings::getValue("databrowser", "null_text").toString();
} else if(role == Qt::DisplayRole && isBinary(index)) {
return "BLOB";
} else if(role == Qt::DisplayRole) {
int limit = Settings::getValue("databrowser", "symbol_limit").toInt();
QByteArray displayText = m_data.at(index.row()).at(index.column());
if (displayText.length() > limit) {
// Add "..." to the end of truncated strings
return decode(displayText.left(limit).append(" ..."));
} else {
return decode(displayText);
}
} else {
return decode(m_data.at(index.row()).at(index.column()));
}
} else if(role == Qt::FontRole) {
QFont font;
if(m_data.at(index.row()).at(index.column()).isNull() || isBinary(index))
font.setItalic(true);
return font;
} else if(role == Qt::ForegroundRole) {
if(m_data.at(index.row()).at(index.column()).isNull())
return QColor(Settings::getValue("databrowser", "null_fg_colour").toString());
else if (isBinary(index))
return QColor(Settings::getValue("databrowser", "bin_fg_colour").toString());
return QColor(Settings::getValue("databrowser", "reg_fg_colour").toString());
} else if (role == Qt::BackgroundRole) {
if(m_data.at(index.row()).at(index.column()).isNull())
return QColor(Settings::getValue("databrowser", "null_bg_colour").toString());
else if (isBinary(index))
return QColor(Settings::getValue("databrowser", "bin_bg_colour").toString());
return QColor(Settings::getValue("databrowser", "reg_bg_colour").toString());
} else if(role == Qt::ToolTipRole) {
sqlb::ForeignKeyClause fk = getForeignKeyClause(index.column()-1);
if(fk.isSet())
return tr("References %1(%2)\nHold Ctrl+Shift and click to jump there").arg(fk.table()).arg(fk.columns().join(","));
else
return QString();
} else {
return QVariant();
}
}
sqlb::ForeignKeyClause SqliteTableModel::getForeignKeyClause(int column) const
{
static const sqlb::ForeignKeyClause empty_foreign_key_clause;
// No foreign keys when not browsing a table. This usually happens when executing custom SQL statements
// and browsing the result set instead of browsing an entire table.
if(m_sTable.isEmpty())
return empty_foreign_key_clause;
// Retrieve database object and check if it is a table. If it isn't stop here and don't return a foreign
// key. This happens for views which don't have foreign keys (though we might want to think about how we
// can check for foreign keys in the underlying tables for some purposes like tool tips).
sqlb::ObjectPtr obj = m_db.getObjectByName(m_sTable);
if(obj->type() != sqlb::Object::Table)
return empty_foreign_key_clause;
// Convert object to a table and check if the column number is in the valid range
sqlb::TablePtr tbl = obj.dynamicCast<sqlb::Table>();
if(tbl && tbl->name().size() && (column >= 0 && column < tbl->fields().count()))
{
// Note that the rowid column has number -1 here, it can safely be excluded since there will never be a
// foreign key on that column.
sqlb::ConstraintPtr ptr = tbl->constraint({tbl->fields().at(column)}, sqlb::Constraint::ForeignKeyConstraintType);
if(ptr)
return *(ptr.dynamicCast<sqlb::ForeignKeyClause>());
}
return empty_foreign_key_clause;
}
bool SqliteTableModel::setData(const QModelIndex& index, const QVariant& value, int role)
{
// Don't even try setting any data if we're not browsing a table, i.e. the model data comes from a custom query
if(!isEditable())
return false;
// This function is for in-place editing.
// So, BLOB flag is false every times.
return setTypedData(index, false, value, role);
}
bool SqliteTableModel::setTypedData(const QModelIndex& index, bool isBlob, const QVariant& value, int role)
{
if(index.isValid() && role == Qt::EditRole)
{
QMutexLocker lock(&m_mutexDataCache);
QByteArray newValue = encode(value.toByteArray());
QByteArray oldValue = m_data.at(index.row()).at(index.column());
// Special handling for integer columns: instead of setting an integer column to an empty string, set it to '0' when it is also
// used in a primary key. Otherwise SQLite will always output an 'datatype mismatch' error.
if(newValue == "" && !newValue.isNull())
{
sqlb::TablePtr table = m_db.getObjectByName(m_sTable).dynamicCast<sqlb::Table>();
if(table)
{
sqlb::FieldPtr field = table->field(table->findField(m_headers.at(index.column())));
if(table->primaryKey().contains(field) && field->isInteger())
newValue = "0";
}
}
// Don't do anything if the data hasn't changed
// To differentiate NULL and empty byte arrays, we also compare the NULL flag
if(oldValue == newValue && oldValue.isNull() == newValue.isNull())
return true;
if(m_db.updateRecord(m_sTable, m_headers.at(index.column()), m_data[index.row()].at(0), newValue, isBlob, m_pseudoPk))
{
// Only update the cache if this row has already been read, if not there's no need to do any changes to the cache
if(index.row() < m_data.size())
m_data[index.row()].replace(index.column(), newValue);
lock.unlock();
emit dataChanged(index, index);
return true;
} else {
lock.unlock();
QMessageBox::warning(nullptr, qApp->applicationName(), tr("Error changing data:\n%1").arg(m_db.lastError()));
return false;
}
}
return false;
}
bool SqliteTableModel::canFetchMore(const QModelIndex&) const
{
QMutexLocker lock(&m_mutexDataCache);
return m_data.size() < (m_rowCount + m_rowCountAdjustment);
}
void SqliteTableModel::fetchMore(const QModelIndex&)
{
m_futureFetch.waitForFinished();
QMutexLocker lock(&m_mutexDataCache);
int row = m_data.size();
fetchData(row, row + m_chunkSize);
}
Qt::ItemFlags SqliteTableModel::flags(const QModelIndex& index) const
{
if(!index.isValid())
return Qt::ItemIsEnabled;
Qt::ItemFlags ret = QAbstractTableModel::flags(index) | Qt::ItemIsDropEnabled;
// Custom display format set?
bool custom_display_format = false;
if(m_vDisplayFormat.size())
{
// NOTE: This assumes that custom display formats never start and end with a backtick
if(index.column() > 0)
custom_display_format = !(m_vDisplayFormat.at(index.column()-1).startsWith("`") && m_vDisplayFormat.at(index.column()-1).endsWith("`"));
}
if(!isBinary(index) && !custom_display_format)
ret |= Qt::ItemIsEditable;
return ret;
}
void SqliteTableModel::sort(int column, Qt::SortOrder order)
{
// Don't do anything when the sort order hasn't changed
if(m_iSortColumn == column && m_sSortOrder == (order == Qt::AscendingOrder ? "ASC" : "DESC"))
return;
// Save sort order
if (column >= 0 && column < m_headers.size())
m_iSortColumn = column;
m_sSortOrder = (order == Qt::AscendingOrder ? "ASC" : "DESC");
// Set the new query (but only if a table has already been set
if(!m_sTable.isEmpty())
buildQuery();
}
bool SqliteTableModel::insertRows(int row, int count, const QModelIndex& parent)
{
if(!isEditable())
return false;
QByteArrayList blank_data;
for(int i=0; i < m_headers.size(); ++i)
blank_data.push_back("");
DataType tempList;
for(int i=row; i < row + count; ++i)
{
QString rowid = m_db.addRecord(m_sTable);
if(rowid.isNull())
{
return false;
}
m_rowCountAdjustment++;
tempList.append(blank_data);
tempList[i - row].replace(0, rowid.toUtf8());
// update column with default values
QByteArrayList rowdata;
if(m_db.getRow(m_sTable, rowid, rowdata))
{
for(int j=1; j < m_headers.size(); ++j)
{
tempList[i - row].replace(j, rowdata[j - 1]);
}
}
}
beginInsertRows(parent, row, row + count - 1);
QMutexLocker lock(&m_mutexDataCache);
for(int i = 0; i < tempList.size(); ++i)
{
m_data.insert(i + row, tempList.at(i));
}
endInsertRows();
return true;
}
bool SqliteTableModel::removeRows(int row, int count, const QModelIndex& parent)
{
if(!isEditable())
return false;
beginRemoveRows(parent, row, row + count - 1);
QMutexLocker lock(&m_mutexDataCache);
bool ok = true;
QStringList rowids;
for(int i=count-1;i>=0;i--)
{
rowids.append(m_data.at(row + i).at(0));
m_data.removeAt(row + i);
--m_rowCountAdjustment;
}
if(!m_db.deleteRecords(m_sTable, rowids))
{
ok = false;
}
endRemoveRows();
return ok;
}
QModelIndex SqliteTableModel::dittoRecord(int old_row)
{
if(!isEditable())
return QModelIndex();
insertRow(rowCount());
int firstEditedColumn = 0;
int new_row = rowCount() - 1;
sqlb::TablePtr t = m_db.getObjectByName(m_sTable).dynamicCast<sqlb::Table>();
sqlb::FieldVector pk = t->primaryKey();
for (int col = 0; col < t->fields().size(); ++col) {
if(!pk.contains(t->fields().at(col))) {
if (!firstEditedColumn)
firstEditedColumn = col + 1;
QVariant value = data(index(old_row, col + 1), Qt::EditRole);
setData(index(new_row, col + 1), value);
}
}
return index(new_row, firstEditedColumn);
}
void SqliteTableModel::fetchData(unsigned int from, unsigned to)
{
// Finish previous loading
m_futureFetch.waitForFinished();
// Fetch more data using a separate thread
m_futureFetch = QtConcurrent::run([=]() {
int num_rows_before_insert = m_data.size();
QString sLimitQuery;
if(m_sQuery.startsWith("PRAGMA", Qt::CaseInsensitive) || m_sQuery.startsWith("EXPLAIN", Qt::CaseInsensitive))
{
sLimitQuery = m_sQuery;
} else {
// Remove trailing trailing semicolon
QString queryTemp = rtrimChar(m_sQuery, ';');
// If the query ends with a LIMIT statement take it as it is, if not append our own LIMIT part for lazy population
if(queryTemp.contains(QRegExp("LIMIT\\s+.+\\s*((,|\\b(OFFSET)\\b)\\s*.+\\s*)?$", Qt::CaseInsensitive)))
sLimitQuery = queryTemp;
else
sLimitQuery = queryTemp + QString(" LIMIT %1, %2;").arg(from).arg(to-from);
}
m_db.logSQL(sLimitQuery, kLogMsg_App);
QByteArray utf8Query = sLimitQuery.toUtf8();
sqlite3_stmt *stmt;
int status = sqlite3_prepare_v2(m_db._db, utf8Query, utf8Query.size(), &stmt, NULL);
if(SQLITE_OK == status)
{
int num_columns = m_headers.size();
while(!m_futureFetch.isCanceled() && sqlite3_step(stmt) == SQLITE_ROW)
{
QMutexLocker lock(&m_mutexDataCache);
QByteArrayList rowdata;
for(int i=0;i<num_columns;++i)
{
if(sqlite3_column_type(stmt, i) == SQLITE_NULL)
{
rowdata.append(QByteArray());
} else {
int bytes = sqlite3_column_bytes(stmt, i);
if(bytes)
rowdata.append(QByteArray(static_cast<const char*>(sqlite3_column_blob(stmt, i)), bytes));
else
rowdata.append(QByteArray(""));
}
}
m_data.push_back(rowdata);
}
}
sqlite3_finalize(stmt);
if(m_data.size() > num_rows_before_insert)
{
beginInsertRows(QModelIndex(), num_rows_before_insert, m_data.size()-1);
endInsertRows();
emit finishedFetch();
}
});
}
void SqliteTableModel::buildQuery()
{
QString where;
if(m_mWhere.size())
{
where = "WHERE ";
for(QMap<int, QString>::const_iterator i=m_mWhere.constBegin();i!=m_mWhere.constEnd();++i)
{
QString column;
if(m_vDisplayFormat.size())
column = QString("col%1").arg(i.key());
else
column = m_headers.at(i.key());
where.append(QString("%1 %2 AND ").arg(sqlb::escapeIdentifier(column)).arg(i.value()));
}
// Remove last 'AND '
where.chop(4);
}
QString selector;
if(m_vDisplayFormat.empty())
{
selector = "*";
} else {
for(int i=0;i<m_vDisplayFormat.size();i++)
selector += m_vDisplayFormat.at(i) + " AS " + QString("col%1").arg(i+1) + ",";
selector.chop(1);
}
// Note: Building the SQL string is intentionally split into several parts here instead of arg()'ing it all together as one.
// The reason is that we're adding '%' characters automatically around search terms (and even if we didn't the user could add
// them manually) which means that e.g. searching for '1' results in another '%1' in the string which then totally confuses
// the QString::arg() function, resulting in an invalid SQL.
QString sql = QString("SELECT %1,%2 FROM %3 ")
.arg(sqlb::escapeIdentifier(m_headers.at(0)))
.arg(selector)
.arg(m_sTable.toString())
+ where
+ QString("ORDER BY %1 %2")
.arg(sqlb::escapeIdentifier(m_headers.at(m_iSortColumn)))
.arg(m_sSortOrder);
setQuery(sql, true);
}
void SqliteTableModel::removeCommentsFromQuery(QString& query) {
// first remove block comments
{
QRegExp rxSQL("^((?:(?:[^'/]|/(?![*]))*|'[^']*')*)(/[*](?:[^*]|[*](?!/))*[*]/)(.*)$"); // set up regex to find block comment
QString result;
while(query.size() != 0)
{
int pos = rxSQL.indexIn(query);
if(pos > -1)
{
result += rxSQL.cap(1) + " ";
query = rxSQL.cap(3);
} else {
result += query;
query = "";
}
}
query = result;
}
// deal with end-of-line comments
{
/* The regular expression for removing end of line comments works like this:
* ^((?:(?:[^'-]|-(?!-))*|(?:'[^']*'))*)(--.*)$
* ^ $ # anchor beginning and end of string so we use it all
* ( )( ) # two separate capture groups for code and comment
* --.* # comment starts with -- and consumes everything afterwards
* (?: | )* # code is none or many strings alternating with non-strings
* (?:'[^']*') # a string is a quote, followed by none or more non-quotes, followed by a quote
* (?:[^'-]|-(?!-))* # non-string is a sequence of characters which aren't quotes or hyphens,
* OR if they are hyphens then they can't be followed immediately by another hyphen
*/
QRegExp rxSQL("^((?:(?:[^'-]|-(?!-))*|(?:'[^']*'))*)(--[^\\r\\n]*)([\\r\\n]*)(.*)$"); // set up regex to find end-of-line comment
QString result;
while(query.size() != 0)
{
int pos = rxSQL.indexIn(query);
if(pos > -1)
{
result += rxSQL.cap(1) + rxSQL.cap(3);
query = rxSQL.cap(4);
} else {
result += query;
query = "";
}
}
query = result.trimmed();
}
// Remove multiple line breaks that might have been created by deleting comments till the end of the line but not including the line break
query.replace(QRegExp("\\n+"), "\n");
// Also remove any remaining whitespace at the end of each line
query.replace(QRegExp("[ \t]+\n"), "\n");
}
QStringList SqliteTableModel::getColumns(const QString& sQuery, QVector<int>& fieldsTypes)
{
sqlite3_stmt* stmt;
QByteArray utf8Query = sQuery.toUtf8();
int status = sqlite3_prepare_v2(m_db._db, utf8Query, utf8Query.size(), &stmt, NULL);
QStringList listColumns;
if(SQLITE_OK == status)
{
sqlite3_step(stmt);
int columns = sqlite3_data_count(stmt);
for(int i = 0; i < columns; ++i)
{
listColumns.append(QString::fromUtf8((const char*)sqlite3_column_name(stmt, i)));
fieldsTypes.push_back(sqlite3_column_type(stmt, i));
}
}
sqlite3_finalize(stmt);
return listColumns;
}
void SqliteTableModel::updateFilter(int column, const QString& value)
{
// Check for any special comparison operators at the beginning of the value string. If there are none default to LIKE.
QString op = "LIKE";
QString val, val2;
QString escape;
bool numeric = false, ok = false;
// range/BETWEEN operator
if (value.contains("~")) {
int sepIdx = value.indexOf('~');
val = value.mid(0, sepIdx);
val2 = value.mid(sepIdx+1);
val.toFloat(&ok);
if (ok) {
val2.toFloat(&ok);
ok = ok && (val.toFloat() < val2.toFloat());
}
}
if (ok) {
op = "BETWEEN";
numeric = true;
} else {
val.clear();
val2.clear();
if(value.left(2) == ">=" || value.left(2) == "<=" || value.left(2) == "<>")
{
// Check if we're filtering for '<> NULL'. In this case we need a special comparison operator.
if(value.left(2) == "<>" && value.mid(2) == "NULL")
{
// We are filtering for '<> NULL'. Override the comparison operator to search for NULL values in this column. Also treat search value (NULL) as number,
// in order to avoid putting quotes around it.
op = "IS NOT";
numeric = true;
val = "NULL";
} else {
bool ok;
value.mid(2).toFloat(&ok);
if(ok)
{
op = value.left(2);
val = value.mid(2);
numeric = true;
}
}
} else if(value.left(1) == ">" || value.left(1) == "<") {
bool ok;
value.mid(1).toFloat(&ok);
if(ok)
{
op = value.left(1);
val = value.mid(1);
numeric = true;
}
} else if(value.left(1) == "=") {
val = value.mid(1);
// Check if value to compare with is 'NULL'
if(val != "NULL")
{
// It's not, so just compare normally to the value, whatever it is.
op = "=";
} else {
// It is NULL. Override the comparison operator to search for NULL values in this column. Also treat search value (NULL) as number,
// in order to avoid putting quotes around it.
op = "IS";
numeric = true;
}
} else {
// Keep the default LIKE operator
// Set the escape character if one has been specified in the settings dialog
QString escape_character = Settings::getValue("databrowser", "filter_escape").toString();
if(escape_character == "'") escape_character = "''";
if(escape_character.length())
escape = QString("ESCAPE '%1'").arg(escape_character);
// Add % wildcards at the start and at the beginning of the filter query, but only if there weren't set any
// wildcards manually. The idea is to assume that a user who's just typing characters expects the wildcards to
// be added but a user who adds them herself knows what she's doing and doesn't want us to mess up her query.
if(!value.contains("%"))
{
val = value;
val.prepend('%');
val.append('%');
}
}
}
if(val.isEmpty())
val = value;
if(!numeric)
val = QString("'%1'").arg(val.replace("'", "''"));
// If the value was set to an empty string remove any filter for this column. Otherwise insert a new filter rule or replace the old one if there is already one
if(val == "''" || val == "'%'" || val == "'%%'")
m_mWhere.remove(column);
else {
QString whereClause(op + " " + QString(encode(val.toUtf8())));
if (!val2.isEmpty())
whereClause += " AND " + QString(encode(val2.toUtf8()));
whereClause += " " + escape;
m_mWhere.insert(column, whereClause);
}
// Build the new query
buildQuery();
}
void SqliteTableModel::clearCache()
{
m_futureFetch.cancel();
m_futureFetch.waitForFinished();
QMutexLocker lock(&m_mutexDataCache);
int size = m_data.size();
if(size > 0)
{
lock.unlock();
beginRemoveRows(QModelIndex(), 0, size - 1);
{
QMutexLocker lock(&m_mutexDataCache);
m_data.clear();
}
endRemoveRows();
}
}
bool SqliteTableModel::isBinary(const QModelIndex& index) const
{
// We're using the same way to detect binary data here as in the EditDialog class. For performance reasons we're only looking at
// the first couple of bytes though.
QByteArray data = m_data.at(index.row()).at(index.column()).left(512);
return QString(data).toUtf8() != data;
}
QByteArray SqliteTableModel::encode(const QByteArray& str) const
{
if(m_encoding.isEmpty())
return str;
else
return QTextCodec::codecForName(m_encoding.toUtf8())->fromUnicode(str);
}
QByteArray SqliteTableModel::decode(const QByteArray& str) const
{
if(m_encoding.isEmpty())
return str;
else
return QTextCodec::codecForName(m_encoding.toUtf8())->toUnicode(str).toUtf8();
}
Qt::DropActions SqliteTableModel::supportedDropActions() const
{
return Qt::CopyAction;
}
bool SqliteTableModel::dropMimeData(const QMimeData* data, Qt::DropAction, int row, int column, const QModelIndex& parent)
{
// What has been dropped on the widget?
if(data->hasUrls())
{
// If it's a URL, open the file and paste the content in the current cell
QList<QUrl> urls = data->urls();
QFile file(urls.first().toLocalFile());
if(file.exists() && file.open(QFile::ReadOnly))
{
setData(index(row, column, parent), file.readAll());
return true;
}
} else if(data->hasText()) {
// If it's just text we can set the cell data directly
setData(index(row, column, parent), data->text());
}
return false;
}
void SqliteTableModel::setPseudoPk(const QString& pseudoPk)
{
// Do nothing if the value didn't change
if(m_pseudoPk == pseudoPk)
return;
if(pseudoPk.isEmpty())
{
m_pseudoPk.clear();
if(m_headers.size())
m_headers[0] = m_sRowidColumn;
} else {
m_pseudoPk = pseudoPk;
if(m_headers.size())
m_headers[0] = pseudoPk;
}
buildQuery();
}
bool SqliteTableModel::isEditable() const
{
return !m_sTable.isEmpty();
}
void SqliteTableModel::waitForFetchingFinished()
{
if(m_futureFetch.isRunning())
m_futureFetch.waitForFinished();
}
void SqliteTableModel::cancelQuery()
{
if(m_rowCount.isRunning())
{
m_rowCount.cancel();
m_rowCount = QtConcurrent::run([=]() {
// Make sure we report 0 rows if anybody asks
return 0;
});
}
if(m_futureFetch.isRunning())
m_futureFetch.cancel();
}
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