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#ifndef QUERYUTIL_H
#define QUERYUTIL_H
#include <QtDebug>
#include <QtSql>
#define LOG_FAILED_QUERY(query) qDebug() << __FILE__ << __LINE__ << "FAILED QUERY [" \
<< (query).executedQuery() << "]" << (query).lastError()
class ScopedTransaction {
public:
explicit ScopedTransaction(QSqlDatabase& database) :
m_database(database),
m_active(false) {
if (!transaction()) {
qDebug() << "ERROR: Could not start transaction on"
<< m_database.connectionName();
}
}
virtual ~ScopedTransaction() {
if (m_active) {
rollback();
}
}
bool active() const {
return m_active;
}
bool transaction() {
if (m_active) {
qDebug() << "WARNING: Transaction already active and received transaction() request on"
<< m_database.connectionName();
return false;
}
m_active = m_database.transaction();
return m_active;
}
bool commit() {
if (!m_active) {
qDebug() << "WARNING: commit() called on inactive transaction for"
<< m_database.connectionName();
return false;
}
bool result = m_database.commit();
qDebug() << "Committing transaction on"
<< m_database.connectionName()
<< "result:" << result;
m_active = false;
return result;
}
bool rollback() {
if (!m_active) {
qDebug() << "WARNING: rollback() called on inactive transaction for"
<< m_database.connectionName();
return false;
}
bool result = m_database.rollback();
qDebug() << "Rolling back transaction on"
<< m_database.connectionName()
<< "result:" << result;
m_active = false;
return result;
}
private:
QSqlDatabase& m_database;
bool m_active;
};
class FieldEscaper {
public:
FieldEscaper(const QSqlDatabase& database)
: m_database(database),
m_stringField("string", QVariant::String) {
}
virtual ~FieldEscaper() {
}
// Escapes a string for use in a SQL query by wrapping with quotes and
// escaping embedded quote characters.
QString escapeString(const QString& escapeString) const {
m_stringField.setValue(escapeString);
return m_database.driver()->formatValue(m_stringField);
}
// Escapes a string for use in a LIKE operation by prefixing instances of
// LIKE wildcard characters (% and _) with escapeCharacter. This allows the
// caller to then attach wildcard characters to the string. This does NOT
// escape the string in the same way that escapeString() does.
QString escapeStringForLike(const QString& escapeString, const QChar escapeCharacter) const {
QString escapeCharacterStr(escapeCharacter);
QString result = escapeString;
// Replace instances of escapeCharacter with two escapeCharacters.
result = result.replace(
escapeCharacter, escapeCharacterStr + escapeCharacterStr);
// Replace instances of % or _ with $escapeCharacter%.
if (escapeCharacter != '%') {
result = result.replace("%", escapeCharacterStr + "%");
}
if (escapeCharacter != '_') {
result = result.replace("_", escapeCharacterStr + "_");
}
return result;
}
private:
const QSqlDatabase& m_database;
mutable QSqlField m_stringField;
};
#endif /* QUERYUTIL_H */
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