fe12aa6a
 Steven de Ridder
Initial commit. d...
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/* ****************************************************************************
* Copyright 2019 Open Systems Development BV *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the "Software"), *
* to deal in the Software without restriction, including without limitation *
* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
* and/or sell copies of the Software, and to permit persons to whom the *
* Software is furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included in *
* all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
* DEALINGS IN THE SOFTWARE. *
* ***************************************************************************/
#include "dbconnector.h"
#include <QtDebug>
#include <QSqlError>
#include <QSqlDriver>
#include <QSqlField>
#include <QSqlQuery>
#include <QSqlRecord>
#include <QSqlIndex>
#include <QVariant>
#include <QCoreApplication>
#include "log.h"
#include "dcxmlconfig.h"
#include "dbrelation.h"
#include "conversionutils.h"
using namespace osdev::components;
DbConnector::DbConnector()
: m_pWatchDog( QPointer<DbConnectionWatchDog>() )
, m_dataBase()
, m_sUserName()
, m_sPassword()
, m_sDatabaseName()
, m_sHostName()
, m_sDbType()
, m_sDbIdentifier()
, m_bDbOpen( false )
, m_qhRelations()
, m_qhTableInfo()
{
this->constructQueryHash();
}
DbConnector::DbConnector( const QString& sDbIdentifier )
: m_pWatchDog( QPointer<DbConnectionWatchDog>() )
, m_dataBase()
, m_sUserName()
, m_sPassword()
, m_sDatabaseName()
, m_sHostName()
, m_sDbType()
, m_sDbIdentifier( sDbIdentifier )
, m_bDbOpen( false )
, m_qhRelations()
, m_qhTableInfo()
{
this->constructQueryHash();
}
DbConnector::DbConnector( const QString& sUserName,
const QString& sPassword,
const QString& sDatabaseName,
const QString& sHostName,
const QString& sDbType,
const QString& sDbIdentifier )
: m_pWatchDog( QPointer<DbConnectionWatchDog>() )
, m_dataBase()
, m_sUserName( sUserName )
, m_sPassword( sPassword )
, m_sDatabaseName( sDatabaseName )
, m_sHostName( sHostName )
, m_sDbType( sDbType )
, m_sDbIdentifier( sDbIdentifier )
, m_bDbOpen( false )
, m_qhRelations()
, m_qhTableInfo()
{
this->constructQueryHash();
}
DbConnector::DbConnector(const QHash<QString, QString>& _qhCredentials )
: DbConnector( _qhCredentials.value( "username" ),
_qhCredentials.value( "password" ),
_qhCredentials.value( "dbname" ),
_qhCredentials.value( "hostname" ),
_qhCredentials.value( "dbtype" ),
_qhCredentials.value( "identifier" ) )
{
this->constructQueryHash();
}
DbConnector::DbConnector( const DbConnector& source )
: QObject( source.parent() )
, m_pWatchDog( QPointer<DbConnectionWatchDog>() )
, m_dataBase( source.getDatabase() )
, m_sUserName( source.getUsername() )
, m_sPassword( source.getPassWord() )
, m_sDatabaseName( source.getDatabaseName() )
, m_sHostName( source.getHostName() )
, m_sDbType( source.getDbType() )
, m_sDbIdentifier( source.getDbIdentifier() )
, m_bDbOpen( source.isOpen() )
, m_qhRelations()
, m_qhTableInfo()
{
this->constructQueryHash();
}
DbConnector::~DbConnector()
{
}
/****************************************************************************
* C o n n e c t o r a n d G e t / S e t m e t h o d s
****************************************************************************/
bool DbConnector::connectDatabase()
{
m_dataBase = QSqlDatabase::addDatabase( m_sDbType, m_sDbIdentifier );
m_dataBase.setDatabaseName( m_sDatabaseName );
m_dataBase.setHostName( m_sHostName );
m_dataBase.setPassword( m_sPassword );
m_dataBase.setUserName( m_sUserName );
m_bDbOpen = m_dataBase.open();
if( !m_bDbOpen )
{
LogError( "[dbConnector::ConnectDatabase]", QString( "There was an error opening database %1 [dbConnector::ConnectDatabase] %2" )
.arg( m_sDatabaseName).arg(m_dataBase.lastError().text() ) );
LogError( "[dbConnector::ConnectDatabase]", QString( "No use in continuing without a database. Ending %1" ).arg( QCoreApplication::applicationName() ) );
}
else
{
LogInfo( "[dbConnector::ConnectDatabase]", "Database successfull connected" );
}
return m_bDbOpen;
}
void DbConnector::setUserName( const QString& sUserName )
{
m_sUserName = sUserName;
}
QString DbConnector::getUsername() const
{
return m_sUserName;
}
void DbConnector::setPassword(const QString& sPassword )
{
m_sPassword = sPassword;
}
QString DbConnector::getPassWord() const
{
return m_sPassword;
}
void DbConnector::setDatabaseName( const QString& sDatabaseName )
{
m_sDatabaseName = sDatabaseName;
}
QString DbConnector::getDatabaseName() const
{
return m_sDatabaseName;
}
void DbConnector::setHostName(const QString& sHostname )
{
m_sHostName = sHostname;
}
QString DbConnector::getHostName() const
{
return m_sHostName;
}
void DbConnector::setDbType( const QString& sDbType )
{
m_sDbType = sDbType;
}
QString DbConnector::getDbType() const
{
return m_sDbType;
}
void DbConnector::setDbIdentifier(const QString& sDbIdentifier )
{
m_sDbIdentifier = sDbIdentifier;
}
QString DbConnector::getDbIdentifier() const
{
return m_sDbIdentifier;
}
QString DbConnector::getLastError() const
{
return m_dataBase.lastError().text();
}
void DbConnector::setCredentials(const QHash<DCXmlConfig::eDbSettings, QString> &_qhCredentials )
{
m_sUserName = _qhCredentials.value( DCXmlConfig::eDbSettings::eDbUsername );
m_sPassword = _qhCredentials.value( DCXmlConfig::eDbSettings::eDbPassword );
m_sDatabaseName = _qhCredentials.value( DCXmlConfig::eDbSettings::eDbName );
m_sHostName = _qhCredentials.value( DCXmlConfig::eDbSettings::eDbHostName );
m_sDbType = _qhCredentials.value( DCXmlConfig::eDbSettings::eDbType );
m_sDbIdentifier = _qhCredentials.value( DCXmlConfig::eDbSettings::eDbIdentifier );
}
QSqlDatabase DbConnector::getDatabase() const
{
return selectDatabase();
}
bool DbConnector::supportTransactions() const
{
return this->selectDatabase().driver()->hasFeature( QSqlDriver::Transactions );
}
bool DbConnector::transactionBegin()
{
return this->selectDatabase().transaction();
}
bool DbConnector::transactionCommit()
{
return this->selectDatabase().commit();
}
bool DbConnector::transactionRollback()
{
return this->selectDatabase().rollback();
}
/****************************************************************************
* C R U D F u n c t i o n a l i t y
****************************************************************************/
bool DbConnector::createRecord( const QSqlRecord& record, const QString& sTable )
{
// Build the fieldsList and values list, based on the QSqlRecord.
// When done, call createRecord( sField, sValues, sTable );
QStringList lstFields;
QStringList lstValues;
for( int index = 0; index < record.count(); index++ )
{
lstFields.append( this->quoteFieldName( record.fieldName( index ) ) );
lstValues.append( this->quoteFieldValue( record.field(index).value() ) );
}
if( lstFields.isEmpty() || lstValues.isEmpty() )
{
return false;
}
return this->createRecord( lstFields.join( "," ), lstValues.join( "," ), this->quoteTableName( sTable ) );
}
bool DbConnector::createRecord(const QString& sFields,
const QString& sValues,
const QString& sTable )
{
bool bResult = false;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
QSqlQuery oQuery( mDb );
bResult = oQuery.exec( "INSERT INTO " + sTable
+ " ( " + sFields + " ) "
+ "VALUES ( " + sValues + " ) " );
if( !bResult )
{
LogError("dbConnector::createRecord",
QString( "There was a problem adding a record : %1 [%2]" )
.arg( oQuery.lastQuery() )
.arg( oQuery.lastError().text() ) );
}
else
{
LogDebug("dbConnector::createRecord", "Record saved to database.");
}
}
else
{
LogError("dbConnector::createRecord",
"Database is closed. Please connect first");
}
return true; // @todo : For now..
}
QSqlQuery* DbConnector::readRecord(const QString& sQuery )
{
QSqlQuery *pQuery = nullptr;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
pQuery = new QSqlQuery( sQuery, mDb );
if( pQuery->exec() )
{
LogError("dbConnector::readRecord",
"There was a problem reading a record : "
+ pQuery->lastError().text());
}
else
{
LogInfo("dbConnector::readRecord", "Record updated.");
}
}
else
{
LogError("dbConnector::readRecord",
"Database is closed. Please connect first");
}
return pQuery;
}
QSqlQuery* DbConnector::readTableData( const QString& sTable ) const
{
QSqlQuery *pQuery = nullptr;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
pQuery = new QSqlQuery( mDb );
QString sQuery = QString( "SELECT * FROM %1" ).arg( this->quoteTableName( sTable) );
if ( !pQuery->exec( sQuery ) )
{
LogError("dbConnector::readTableData",
"There was an error retrieving the tableData");
LogError("dbConnector::readTableData",
pQuery->lastError().text());
LogError("dbConnector::readTableData",
pQuery->lastQuery());
}
}
return pQuery;
}
bool DbConnector::updateRecord(const QString& sIdNumber,
const QString& sIdField,
const QString& sValue,
const QString& sFieldName,
const QString& sTable )
{
bool bResult = false;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
QSqlQuery oQuery( mDb );
bResult = oQuery.exec( "UPDATE " + this->quoteTableName(sTable)
+ " SET " + sFieldName + " = " + sValue
+ " WHERE " + sIdField + " = " + sIdNumber );
if( !bResult )
{
LogError("dbConnector::updateRecord",
"There was a problem updating a record : "
+ oQuery.lastError().text());
}
else
{
LogInfo("dbConnector::updateRecord", "Record updated.");
}
}
else
{
LogError("dbConnector::updateRecord",
"Database is closed. Please connect first");
}
return bResult;
}
bool DbConnector::deleteRecord( const QString& sIdNumber,
const QString& sIdField,
const QString& sTable )
{
bool bResult = false;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
QSqlQuery oQuery( mDb );
bResult = oQuery.exec( "DELETE FROM " + this->quoteTableName(sTable)
+ " WHERE ( " + sIdField + ")"
+ " = ( " + sIdNumber + " ) " );
if( !bResult )
{
LogError("dbConnector::deleteRecord",
"There was a problem deleting a record : "
+ oQuery.lastError().text());
}
else
{
LogInfo("dbConnector::deleteRecord",
"Record deleted from database.");
}
}
else
{
LogError("dbConnector::deleteRecord",
"Database is closed. Please connect first");
}
return bResult;
}
/****************************************************************************
* H E L P E R M E T H O D S
****************************************************************************/
bool DbConnector::clearTable( const QString& sTableName )
{
bool bResult = false;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
QSqlQuery oQuery( mDb );
bResult = oQuery.exec( "DELETE FROM " + this->quoteTableName(sTableName) );
if( !bResult )
{
LogError("dbConnector::clearTable",
"There was a problem deleting the records : "
+ oQuery.lastError().text());
}
else
{
LogInfo("dbConnector::clearTable", "Table " + sTableName + " Emptied.");
bResult = true;
}
}
else
{
LogError("dbConnector::clearTable",
"Database is closed. Please connect first");
}
return bResult;
}
int DbConnector::getNumRecords( const QString& sTable ) const
{
int nResult = -1;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
QSqlQuery oQuery( mDb );
if( oQuery.exec( "SELECT COUNT(*) as NumRecords FROM " + this->quoteTableName(sTable) ) )
{
nResult = 0;
// Retrieve the Numbers of Records
while ( oQuery.next() )
{
nResult += oQuery.record().value( "NumRecords" ).toInt();
}
}
else
{
LogError("dbConnector::getNumRecords",
"There was a problem counting the records : "
+ oQuery.lastError().text());
}
}
else
{
LogError("dbConnector::getNumRecords", "Database is closed. Please connect first");
}
return nResult;
}
bool DbConnector::recordsExist( const QString& sTable, const QString& sField, const QList<QVariant>& slFieldValues) const
{
static const QString countQuery("SELECT COUNT(DISTINCT %2) as NumRecords FROM %1 WHERE %2 IN ( %3 )");
if (slFieldValues.isEmpty())
{
return true;
}
QStringList valueList;
for ( const auto& v : slFieldValues)
{
valueList.append(this->toSqlValueString(v));
}
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fe12aa6a
Steven de Ridder
Initial commit. d...
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auto queryResult = this->executeQuery(countQuery
.arg(this->quoteTableName(sTable))
.arg(this->quoteFieldName(sField))
.arg(uniqueValueList.join(",")));
if (!queryResult)
{
return false;
}
int nResult = 0;
while ( queryResult->next() )
{
nResult += queryResult->record().value( "NumRecords" ).toInt();
}
return ( uniqueValueList.size() == nResult );
}
QStringList DbConnector::getTableNames() const
{
QStringList lstTableNames;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
lstTableNames = mDb.tables();
}
return lstTableNames;
}
QStringList DbConnector::getFieldNames( const QString& tableName ) const
{
return QStringList( this->getFieldNamesAndTypes( tableName ).keys() );
}
QHash<QString, QVariant::Type> DbConnector::getFieldNamesAndTypes(
const QString& tableName ) const
{
QHash<QString, QVariant::Type> qhResult;
QString _table;
// Check if there is a 'dot' in the tablename. A Scheme is present which should be removed.
if( tableName.contains( "." ) )
{
_table = stripSchemaFromTable( tableName );
}
else
{
_table = tableName;
}
// Build the correct query to get all the information of the given table.
QString sQuery = m_qhTableInfo.value( m_dataBase.driver()->dbmsType() ).arg( _table );
if( !sQuery.isNull() && !sQuery.isEmpty() )
{
QSqlQuery oQuery( this->selectDatabase() );
if( oQuery.exec( sQuery ) )
{
while( oQuery.next() )
{
QString sFieldName = oQuery.value( 0 ).toString();
QVariant::Type vFieldType = ConversionUtils::stringToQvarType( oQuery.value( 1 ).toString() );
qhResult.insert( sFieldName, vFieldType );
}
}
else
{
// The query failed. Lets figure out why..
LogDebug( "[DbConnector::getFieldNamesAndTypes]", QString( "The query reported an error : \n %1 for error : %2 \n" )
.arg( oQuery.lastError().text() )
.arg( sQuery ) );
}
}
return qhResult;
}
QSqlDatabase DbConnector::selectDatabase() const
{
QSqlDatabase dbResult;
if ( !m_sDbIdentifier.isEmpty() )
{
dbResult = QSqlDatabase::database( m_sDbIdentifier );
}
else
{
dbResult = m_dataBase;
}
return dbResult;
}
bool DbConnector::associate( const QString& tableName, const QString& filterField, const QList<QVariant>& filterValueList, const QString& associateToField, const QVariant& associateToValue )
{
static const QString sQuery("UPDATE %1 SET %2 = %3 WHERE %4 IN ( %5 )");
if (filterValueList.isEmpty())
{
return true;
}
QStringList valueList;
for (const auto& value : filterValueList)
{
valueList.append(this->toSqlValueString(value));
}
const auto q = this->executeQuery( sQuery
.arg(this->quoteTableName(tableName))
.arg(this->quoteFieldName(associateToField))
.arg(this->toSqlValueString(associateToValue))
.arg(this->quoteFieldName(filterField))
.arg(this->toSqlValueString(filterValueList)));
if (q && !q->lastError().isValid())
{
return true;
}
return false;
}
bool DbConnector::disassociate( const QString& tableName, const QString& filterField, const QList<QVariant>& filterValueList, const QString& associateToField, const QVariant& associateToValue )
{
static const QString sDisassociateQuery("UPDATE %1 SET %2 = NULL WHERE %3 NOT IN ( %4 ) AND %2 = %5");
static const QString sDisassociateAllQuery("UPDATE %1 SET %2 = NULL WHERE %3 = %4");
QString sQuery;
if (filterValueList.isEmpty())
{
sQuery = sDisassociateAllQuery
.arg(this->quoteTableName(tableName))
.arg(this->quoteFieldName(associateToField))
.arg(this->quoteFieldName(associateToField))
.arg(this->toSqlValueString(associateToValue));
}
else
{
QStringList valueList;
sQuery = sDisassociateQuery
.arg(this->quoteTableName(tableName))
.arg(this->quoteFieldName(associateToField))
.arg(this->quoteFieldName(filterField))
.arg(this->toSqlValueString(filterValueList))
.arg(this->toSqlValueString(associateToValue));
}
const auto q = this->executeQuery( sQuery );
if (q && !q->lastError().isValid())
{
return true;
}
return false;
}
std::unique_ptr<QSqlQuery> DbConnector::executeQuery( const QString& sQuery ) const
{
std::unique_ptr<QSqlQuery> pQuery;
QSqlDatabase mDb = this->selectDatabase();
if( mDb.isValid() && mDb.isOpen() )
{
pQuery.reset(new QSqlQuery( sQuery, mDb ));
const auto err = pQuery->lastError();
if(err.isValid())
{
QString queryString = pQuery->executedQuery();
if (queryString.isEmpty())
{
queryString = pQuery->lastQuery();
}
LogError("dbConnector::executeQuery",
QString( "Query '%1' gave error : '%2'" )
.arg(queryString)
.arg(err.text()));
}
}
else
{
LogError("dbConnector::executeQuery",
"Database is closed. Please connect first");
}
return pQuery;
}
QString DbConnector::toSqlValueString(const QVariant& value) const
{
LogDebug("DbConnector::toSqlValueString", QString("Value is %1 (type is %2)").arg(value.toString()).arg(value.type()));
switch(value.type())
{
case QVariant::Int:
return value.toString();
case QVariant::Uuid:
return "'" + value.toString().replace( "{", "" ).replace( "}", "" ) + "'";
case QVariant::List:
{
QStringList valueList;
for ( const auto& v : value.toList() )
{
valueList.append( this->toSqlValueString( v ) );
}
return valueList.join( "," );
}
default:
return "'" + value.toString() + "'";
}
}
QHash<QString, QList<DbRelation*> > DbConnector::getRelations( const QStringList& tables )
{
QHash<QString, QList<DbRelation*> > qhResult;
/* First we get the type of database we're using. For each database type
* ( MySQL, PostGresQL or ORACLE ) the way of retrieving is different.
* We make sure the returned fields are always the same..
*/
// Check if the query database was build or not..
if( 0 == m_qhRelations.count() )
{
constructQueryHash();
}
// Return the query of our database...
QString relQuery = m_qhRelations.value( m_dataBase.driver()->dbmsType() );
if( relQuery.isEmpty() ) /// Probably not a match or not implemented..
{
return QHash<QString, QList<DbRelation*>>();
}
else
{
// Retrieve the list of tables from the configuration :
QStringList tableList = tables;
if( tableList.isEmpty() && 0 == tableList.count() )
{
tableList = this->getTableNames();
}
for( auto& table : tableList )
{
qhResult.insert( table, getRelationByTableName( table ) );
}
}
return qhResult;
}
void DbConnector::constructQueryHash()
{
m_qhRelations.insert(QSqlDriver::UnknownDbms, "");
m_qhRelations.insert(QSqlDriver::MSSqlServer, "");
m_qhRelations.insert(QSqlDriver::MySqlServer, "SELECT \
TABLE_SCHEMA AS schema_name, \
TABLE_NAME AS table_name, \
CONSTRAINT_NAME AS constraint_name, \
COLUMN_NAME AS index_column, \
REFERENCED_TABLE_NAME AS foreign_table, \
REFERENCED_COLUMN_NAME AS foreign_column \
FROM \
INFORMATION_SCHEMA.KEY_COLUMN_USAGE \
WHERE \
TABLE_SCHEMA = SCHEMA() \
AND \
TABLE_NAME = '%1' \
AND \
REFERENCED_TABLE_NAME IS NOT NULL" );
// @todo : Different schemas in the same database, with the same constraints will screw this up...
m_qhRelations.insert(QSqlDriver::PostgreSQL, "SELECT DISTINCT \
n.nspname AS schema_name, \
pc.relname AS table_name, \
r.conname AS constraint_name, \
pc1.relname AS foreign_table, \
r.contype AS constraint_type, \
pg_catalog.pg_get_constraintdef(r.oid) as definition \
FROM \
pg_constraint AS r \
JOIN pg_catalog.pg_namespace n on n.oid = r.connamespace \
JOIN pg_class AS pc ON pc.oid = r.conrelid \
LEFT JOIN pg_class AS pc1 ON pc1.oid = r.confrelid \
WHERE \
r.contype = 'f' \
AND \
pc.relname = '%1' \
ORDER BY \
schema_name, \
table_name, \
foreign_table" );
m_qhRelations.insert(QSqlDriver::Oracle, "");
m_qhRelations.insert(QSqlDriver::Sybase, "");
m_qhRelations.insert(QSqlDriver::SQLite, "");
m_qhRelations.insert(QSqlDriver::Interbase, "");
m_qhRelations.insert(QSqlDriver::DB2, "" );
// ============================================================================================================
// Build the table Information Query Hash
// ============================================================================================================
m_qhTableInfo.insert(QSqlDriver::UnknownDbms, "");
m_qhTableInfo.insert(QSqlDriver::MSSqlServer, "");
m_qhTableInfo.insert(QSqlDriver::MySqlServer, "SELECT COLUMN_NAME, DATA_TYPE FROM information_schema.COLUMNS WHERE TABLE_NAME = '%1'" );
m_qhTableInfo.insert(QSqlDriver::PostgreSQL, "SELECT COLUMN_NAME, DATA_TYPE FROM information_schema.COLUMNS WHERE TABLE_NAME = '%1'" );
m_qhTableInfo.insert(QSqlDriver::Oracle, "");
m_qhTableInfo.insert(QSqlDriver::Sybase, "");
m_qhTableInfo.insert(QSqlDriver::SQLite, "");
m_qhTableInfo.insert(QSqlDriver::Interbase, "");
m_qhTableInfo.insert(QSqlDriver::DB2, "" );
}
QList<DbRelation*> DbConnector::getRelationByTableName( const QString& tableName )
{
QList<DbRelation*> qlResult;
if ( 0 == m_qhRelations.count() || 0 == m_qhTableInfo.count() )
{
this->constructQueryHash();
}
// Return the query of our database...
QString relQuery = m_qhRelations.value( m_dataBase.driver()->dbmsType() );
if( !relQuery.isEmpty() )
{
QSqlQuery oQuery( this->selectDatabase() );
if( oQuery.exec( relQuery.arg( stripSchemaFromTable( tableName ) ) ) )
{
while( oQuery.next() )
{
DbRelation *pRel = new DbRelation();
pRel->setSchemaName( oQuery.record().value( "schema_name" ).toString() );
pRel->setTableName( oQuery.record().value( "table_name" ).toString() );
pRel->setConstraintName( oQuery.record().value( "constraint_name" ).toString() );
switch ( m_dataBase.driver()->dbmsType() )
{
case QSqlDriver::UnknownDbms:
case QSqlDriver::MSSqlServer:
case QSqlDriver::Oracle:
case QSqlDriver::Sybase:
case QSqlDriver::SQLite:
case QSqlDriver::Interbase:
case QSqlDriver::DB2:
pRel->setIndexColumn( "" );
break;
case QSqlDriver::PostgreSQL:
pRel->setIndexColumn(
parseDefinition(
oQuery.record().value( "definition" ).toString() ) );
// Get schema name associated with the foreign table, instead of the target-table.
pRel->setForeignTable( getSchemaByTable( oQuery.record().value( "foreign_table" ).toString() ) );
break;
case QSqlDriver::MySqlServer:
pRel->setIndexColumn( oQuery.record().value("index_column").toString() );
pRel->setForeignTable( oQuery.record().value( "foreign_table" ).toString() );
break;
}
pRel->setForeignPrimKey( this->getPrimaryKey( oQuery.record().value( "foreign_table" ).toString() ) );
qlResult.append( pRel );
LogDebug( "[DbConnector::getRelationByTableName]", QString( "Relation->schemaName : %1" ).arg( pRel->schemaName() ) );
LogDebug( "[DbConnector::getRelationByTableName]", QString( "Relation->tableName : %1" ).arg( pRel->tableName() ) );
LogDebug( "[DbConnector::getRelationByTableName]", QString( "Relation->constraintName : %1" ).arg( pRel->constraintName() ) );
LogDebug( "[DbConnector::getRelationByTableName]", QString( "Relation->foreignTable : %1" ).arg( pRel->foreignTable() ) );
LogDebug( "[DbConnector::getRelationByTableName]", QString( "Relation->indexColumn : %1" ).arg( pRel->indexColumn() ) );
}
}
else
{
LogInfo( "[DbConnector::getRelationByTableName]", QString( "There were no relations for table : %1" ).arg( tableName ) );
LogInfo( "[DbConnector::getRelationByTableName]", QString( "Query executed : %1" ).arg( oQuery.lastQuery() ) );
LogInfo( "[DbConnector::getRelationByTableName]", QString( "Query reported the following error : %1" ).arg( oQuery.lastError().text() ) );
}
}
else
{
LogInfo( "[DbConnector::getRelationByTableName]", QString( "No query was found for database type : %1" ).arg( m_dataBase.driverName() ) );
}
return qlResult;
}
QString DbConnector::parseDefinition( const QString& definition ) const
{
QString _definition = definition;
QString leftPattern = "FOREIGN KEY (";
QString rightPattern = ") REFERENCES";
QString noLeft = _definition.replace( leftPattern, "" );
return noLeft.left( noLeft.indexOf( rightPattern ) ).replace( "\"", "" );
}
QString DbConnector::stripSchemaFromTable( const QString& tableName ) const
{
QString sResult = tableName;
if( tableName.contains(".") )
{
sResult = tableName.right( tableName.size() - tableName.indexOf( "." ) - 1 ).replace("\"", "");
}
return sResult;
}
QVariant DbConnector::getRelationKey( const QString& tableName,
const QString& filterField,
const QVariant& filterValue,
const QString& foreignPrimKey ) const
{
QString l_primKey;
if( foreignPrimKey.isNull() || foreignPrimKey.isEmpty() )
{
// Retrieve the primary key of the given table.
l_primKey = this->getPrimaryKey( tableName );
}
else
{
l_primKey = foreignPrimKey;
}
// If none was found, return an empty QVariant
if ( l_primKey.isNull() )
{
LogInfo( "[DbConnector::getRelationKey]",
QString( "There was no primary keyfield found for : %1" )
.arg( tableName ) );
return QVariant();
}
// Build the QueryString with the parameters given :
// %1 - Primary Key ( l_primKey )
// %2 - tableName (Quoted if needed)
// %3 - filterField
// %4 - filterValue
QString sQuery = QString( "SELECT \"%1\" FROM %2 WHERE \"%3\" = '%4'" )
.arg( l_primKey, this->quoteTableName(tableName), filterField, filterValue.toString().replace("{", "").replace( "}", "" ) );
QVariant l_resPK;
QSqlQuery oQuery( m_dataBase );
if( oQuery.exec( sQuery ) && oQuery.first() && oQuery.size() == 1 )
{
l_resPK = oQuery.value( l_primKey );
}
else if( oQuery.size() > 1 )
{
LogInfo( "[DbConnector::getRelationKey]",
QString( "Multiple records found for value : %1" )
.arg( filterValue.toString() ) );
}
else
{
LogInfo( "[DbConnector::getRelationKey]",
QString( "There was no primary key retrieved for : %1" )
.arg( sQuery ) );
}
return l_resPK;
}
QString DbConnector::getPrimaryKey( const QString& tableName ) const
{
switch( m_dataBase.driver()->dbmsType() )
{
case QSqlDriver::MySqlServer:
return this->getPrimaryKeyMySQL( tableName );
case QSqlDriver::PostgreSQL:
return this->getPrimaryKeyPostGreSQL( tableName );
case QSqlDriver::UnknownDbms:
case QSqlDriver::MSSqlServer:
case QSqlDriver::Oracle:
case QSqlDriver::Sybase:
case QSqlDriver::SQLite:
case QSqlDriver::Interbase:
case QSqlDriver::DB2:
break;
}
return QString();
}
QString DbConnector::getPrimaryKeyMySQL( const QString& tableName ) const
{
QString sQuery = QString( "SHOW INDEX FROM %1 WHERE Key_name = '%2'" )
.arg( tableName )
.arg( m_dataBase.primaryIndex( this->quoteTableName( tableName ) ).name() );
QSqlQuery oQuery( m_dataBase );
if( oQuery.exec( sQuery ) && oQuery.first() && oQuery.size() == 1 )
{
return oQuery.value( "Column_name" ).toString();
}
return QString();
}
QString DbConnector::getPrimaryKeyPostGreSQL( const QString& tableName ) const
{
QString sResult;
QString _table;
if( tableName.contains( "." ) )
{
_table = this->stripSchemaFromTable( tableName );
}
else
{
_table = tableName;
}
QString sQuery = QString("SELECT \
c.column_name AS key_field, \
c.data_type AS key_type, \
tc.table_name AS table_name \
FROM \
information_schema.table_constraints tc \
JOIN \
information_schema.constraint_column_usage AS ccu \
USING (constraint_schema, constraint_name) \
JOIN \
information_schema.columns AS c ON c.table_schema = tc.constraint_schema \
AND \
tc.table_name = c.table_name AND ccu.column_name = c.column_name \
WHERE \
constraint_type = 'PRIMARY KEY' \
AND \
tc.table_name = '%1'").arg( _table );
QSqlQuery oQuery( m_dataBase );
if( oQuery.exec( sQuery ) )
{
// Select the first record.
oQuery.first();
LogDebug( "[DbConnector::getPrimaryKeyPostGreSQL]",
QString( "KeyField found.. : %1" ).arg( oQuery.value( "key_field" ).toString() ) );
sResult = oQuery.value( "key_field" ).toString();
}
else
{
LogInfo( "[DbConnector::getPrimaryKeyPostGreSQL]",
QString( "There was an error running the query : %1" ).arg( sQuery ) );
LogInfo( "[DbConnector::getPrimaryKeyPostGreSQL]",
QString( "Dblayer gave error : %1" ).arg( oQuery.lastError().text() ) );
}
return sResult;
}
QString DbConnector::quoteTableName( const QString& tableName ) const
{
QString sResult( tableName );
switch( m_dataBase.driver()->dbmsType() )
{
case QSqlDriver::MySqlServer:
return sResult;
case QSqlDriver::PostgreSQL:
if( -1 == sResult.indexOf( "\"" ) )
{
// Ok. Seems like it is not quoted.
sResult = QString( "\"" + QString( sResult.replace('.', "\".\"" ) + "\"") );
return sResult;
}
else
{
return sResult;
}
case QSqlDriver::UnknownDbms:
case QSqlDriver::MSSqlServer:
case QSqlDriver::Oracle:
case QSqlDriver::Sybase:
case QSqlDriver::SQLite:
case QSqlDriver::Interbase:
case QSqlDriver::DB2:
LogInfo( "[OrmHandler::quoteTableName]",
QString( "Unknown database requested : %1" )
.arg( m_dataBase.driverName() ) );
break;
}
return sResult;
}
QString DbConnector::quoteFieldName( const QString& fieldName ) const
{
QString sResult( fieldName );
switch( m_dataBase.driver()->dbmsType() )
{
case QSqlDriver::MySqlServer:
return sResult;
case QSqlDriver::PostgreSQL:
if( -1 == sResult.indexOf( "\"" ) )
{
// Ok. Seems like it is not quoted.
sResult = QString( "\"%1\"" ).arg(fieldName);
return sResult;
}
else
{
return sResult;
}
case QSqlDriver::UnknownDbms:
case QSqlDriver::MSSqlServer:
case QSqlDriver::Oracle:
case QSqlDriver::Sybase:
case QSqlDriver::SQLite:
case QSqlDriver::Interbase:
case QSqlDriver::DB2:
LogInfo( "[OrmHandler::quoteFieldName]",
QString( "Unknown database requested : %1" )
.arg( m_dataBase.driverName() ) );
break;
}
return sResult;
}
QString DbConnector::quoteFieldValue( const QVariant& value ) const
{
QString sResult( value.toString() );
switch( value.type() )
{
case QVariant::Uuid:
case QVariant::Date:
case QVariant::DateTime:
case QVariant::String:
sResult = QString( "%1%2%1" ).arg( quoteChar() ).arg( sResult );
break;
default:
break;
}
return sResult;
}
QString DbConnector::quoteChar() const
{
QString sResult = "";
switch( m_dataBase.driver()->dbmsType() )
{
case QSqlDriver::MySqlServer:
return sResult;
case QSqlDriver::PostgreSQL:
sResult = QString( "'" );
return sResult;
case QSqlDriver::UnknownDbms:
case QSqlDriver::MSSqlServer:
case QSqlDriver::Oracle:
case QSqlDriver::Sybase:
case QSqlDriver::SQLite:
case QSqlDriver::Interbase:
case QSqlDriver::DB2:
LogInfo( "[OrmHandler::quoteFieldName]",
QString( "Unsupported database requested : %1" )
.arg( m_dataBase.driverName() ) );
break;
}
return sResult;
}
QString DbConnector::getSchemaByTable( const QString& tableName ) const
{
QString sResult;
QString sQuery;
switch( m_dataBase.driver()->dbmsType() )
{
case QSqlDriver::PostgreSQL:
sQuery = QString( "SELECT \
table_schema, \
table_name \
FROM \
information_schema.tables \
WHERE \
table_name = '%1'" )
.arg( tableName );
break;
case QSqlDriver::MySqlServer:
case QSqlDriver::UnknownDbms:
case QSqlDriver::MSSqlServer:
case QSqlDriver::Oracle:
case QSqlDriver::Sybase:
case QSqlDriver::SQLite:
case QSqlDriver::Interbase:
case QSqlDriver::DB2:
LogInfo( "[OrmHandler::quoteTableName]",
QString( "Unknown database requested : %1" )
.arg( m_dataBase.driverName() ) );
break;
}
// If no joy, return an empty string.
if( sQuery.isEmpty() )
{
return QString();
}
// Geronimo!
QSqlQuery oQuery( m_dataBase );
if( oQuery.exec( sQuery ) )
{
if( oQuery.first() )
{
sResult = oQuery.value( "table_schema" ).toString() + QString( "." ) + tableName;
}
}
return sResult;
}
void DbConnector::slotDbConnected( const QString& db_name, bool is_open )
{
// We're not using the name (yet) already there for future implementations.
Q_UNUSED( db_name );
m_bDbOpen = is_open;
}
void DbConnector::startDbWatchDog( const int check_interval )
{
if( m_pWatchDog.isNull() )
{
m_pWatchDog = new DbConnectionWatchDog( check_interval, this );
#if( QT_VERSION >= QT_VERSION_CHECK( 5, 2, 0) )
connect( m_pWatchDog.data(), &DbConnectionWatchDog::signalDbConnected, this, &DbConnector::slotDbConnected );
#else
connect( m_pWatchDog.data(), SIGNAL( signalDbConnected( const QString&, bool ) ), this, SLOT( slotDbConnected( const QString& bool ) ) );
#endif
}
if( m_pWatchDog )
{
m_pWatchDog->start();
LogInfo( "[DbConnector::startDbWatchDog]", QString( "Database Watchdog started with interval : %1" ).arg( check_interval ) );
}
}
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