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dynodb.cpp
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dynodb.cpp
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#include "dynodb.h"
#include "datatypes.h"
#include "predicate.h"
#include "predicateelement.h"
DynoDB* DynoDB::instance_ = 0;
DynoDB* DynoDB::getInstance()
{
return instance_;
}
DynoDB::DynoDB(QString hostName,
QString databaseName,
QString userName,
QString password)
{
database = QSqlDatabase::addDatabase("QMYSQL");
database.setHostName(hostName);
database.setDatabaseName(databaseName);
database.setUserName(userName);
database.setPassword(password);
valid = database.open();
if(!valid)
{
return;
}
valid = initialize();
if(valid)
{
instance_ = this;
}
}
bool DynoDB::isValid() const
{
return valid;
}
quint32 DynoDB::addPredicate(Predicate* predicate)
{
quint32 id = createGibly();
if(id == 0)
{
return id;
}
PredicateElement const* firstPredicateElement = predicate->getElement(0);
// If we are defining a new class
if(firstPredicateElement->getId() == CLASS)
{
// This must be a binary predicate
if(predicate->getNumElements() != 2)
{
deleteGibly(id);
return 0;
}
PredicateElement const* namePredicateElement = predicate->getElement(1);
// The second predicate must be a literal
if(!namePredicateElement->isLiteral())
{
deleteGibly(id);
return 0;
}
bool didCreateClass = createClass(id, namePredicateElement->toString());
if(!didCreateClass)
{
deleteGibly(id);
return 0;
}
}
// Otherwise if we are defining a new literal
else if(firstPredicateElement->getId() > LITERAL &&
firstPredicateElement->getId() < MAX_DATA_TYPE)
{
// This must be a binary predicate
if(predicate->getNumElements() != 2)
{
deleteGibly(id);
return 0;
}
PredicateElement const* namePredicateElement = predicate->getElement(1);
// The second predicate must be a literal
if(!namePredicateElement->isLiteral())
{
deleteGibly(id);
return 0;
}
bool didCreateLiteral = createLiteral(id, namePredicateElement->toString(),
firstPredicateElement->getId());
if(!didCreateLiteral)
{
deleteGibly(id);
return 0;
}
}
// Otherwise if we are defining a literal relation
else if(isLiteral(firstPredicateElement->getId()))
{
// This must be a ternary predicate
if(predicate->getNumElements() != 3)
{
deleteGibly(id);
return 0;
}
PredicateElement const* giblyPredicateElement = predicate->getElement(1);
if(giblyPredicateElement->isLiteral() || giblyPredicateElement->isSet())
{
deleteGibly(id);
return 0;
}
PredicateElement const* literalPredicateElement = predicate->getElement(2);
if(!literalPredicateElement->isLiteral())
{
deleteGibly(id);
return 0;
}
// TODO: Probably a cleaner way to do this than deleting the gibly right after creating it
deleteGibly(id);
bool addedRelation = addRelation(giblyPredicateElement->getId(), firstPredicateElement->getId(), literalPredicateElement->getLiteral());
if(!addedRelation)
{
deleteGibly(id);
return 0;
}
}
// Otherwise if we are creating an instance of a class
else if(isClass(firstPredicateElement->getId()))
{
// If this is just a class instantiation
if (predicate->getNumElements() == 1)
{
if(!hasTable(firstPredicateElement->getId()))
{
bool createdTable = makeClassTable(firstPredicateElement->getId());
if(!createdTable)
{
deleteGibly(id);
return 0;
}
}
bool createdInstance = createInstance(firstPredicateElement->getId(), id);
if(!createdInstance)
{
deleteGibly(id);
return 0;
}
}
// Otherwise this is a relationship being defined
else
{
QList<quint32> classIds;
QList<quint32> giblyIds;
QList<quint32> quantities;
for (qint8 remainingPredicateIndex = 1; remainingPredicateIndex < predicate->getNumElements(); remainingPredicateIndex++)
{
PredicateElement const* predicateElement = predicate->getElement(remainingPredicateIndex);
if (predicateElement->isLiteral())
{
//TODO: clean this up in the future because it is kind of a waste
deleteGibly(id);
return 0;
}
else
{
if(predicateElement->isSet())
{
quint32 classId = getClass(predicateElement->getIds().first());
if (!classId)
{
//TODO: clean this up in the future because it is kind of a waste
deleteGibly(id);
return 0;
}
classIds.append(classId);
giblyIds.append(predicateElement->getIds());
quantities.append(predicateElement->getIds().size());
}
else
{
giblyIds.append(predicate->getElement(remainingPredicateIndex)->getId());
quint32 classId = getClass(giblyIds.last());
if (!classId)
{
//TODO: clean this up in the future because it is kind of a waste
deleteGibly(id);
return 0;
}
else
{
classIds.append(classId);
}
quantities.append(1);
}
}
}
quint32 relationGroupId = relationTypeExists(predicate->getElement(0)->getId(), classIds, quantities);
if (relationGroupId == 0)
{
relationGroupId = registerRelationType(predicate->getElement(0)->getId(), classIds, quantities);
if(relationGroupId == 0)
{
deleteGibly(id);
return 0;
}
}
if(!addRelation(id, firstPredicateElement->getId(), relationGroupId, classIds, quantities, giblyIds))
{
deleteGibly(id);
return 0;
}
}
}
else
{
deleteGibly(id);
return 0;
}
return id;
}
QList<QPair<quint32, QMap<QString, QString>>> DynoDB::processQuery(Predicate const* predicate)
{
// Get the list of gibly Ids that match this query
QList<quint32> internalQueryResults = processInternalQuery(predicate);
// Initiate the query results list
QList<QPair<quint32, QMap<QString, QString>>> queryResults;
// Loop through the giblies that we got from the internal query
for(qint32 giblyIndex = 0; giblyIndex < internalQueryResults.size();
giblyIndex++)
{
// The current gibly we're looking at
quint32 giblyId = internalQueryResults.at(giblyIndex);
// Get the class of this gibly
int classId = getClass(giblyId);
// Get all column relations for this class
QString getRelationsQueryStatement = "SELECT Id FROM `%1` WHERE `%2` = %3 AND '%4' = 1";
getRelationsQueryStatement = getRelationsQueryStatement
.arg(RELATION)
.arg(CLASS)
.arg(classId)
.arg(IS_COLUMN);
QSqlQuery getRelationsQuery = database.exec(getRelationsQueryStatement);
QString getValuesQueryStatement = "SELECT ";
if(!getRelationsQuery.next())
{
return queryResults;
}
bool processedAllQueryResults = false;
// Loop through each column relation in this class
do
{
bool ok;
// Get the id of this column
quint32 relationId = getRelationsQuery.value(0).toInt(&ok);
if(!ok)
{
return queryResults;
}
// Append this id to your select statement
getValuesQueryStatement.append(QString("`%1`").arg(relationId));
// If this isn't the end of the list, add a comma to separate the next id
if(getRelationsQuery.next())
{
getValuesQueryStatement.append(", ");
}
else
{
processedAllQueryResults = true;
}
} while (!processedAllQueryResults);
getValuesQueryStatement.append(" FROM `%1` WHERE Id = %2");
getValuesQueryStatement = getValuesQueryStatement
.arg(classId)
.arg(giblyId);
QSqlQuery getValuesQuery = database.exec(getValuesQueryStatement);
if(!getValuesQuery.next())
{
return queryResults;
}
// A map of the relation-value pairs
QMap<QString, QString> attributeValues;
// Loop through the values of the relations of this gibly
for(qint32 attributeIndex = 0; attributeIndex < getValuesQuery.record().count();
attributeIndex++)
{
// Add this relation name and value to the map
attributeValues.insert(getValuesQuery.record().fieldName(attributeIndex),
getValuesQuery.value(attributeIndex).toString());
}
// Create a tuple of the gibly Id and its attribute value pairs
QPair<quint32, QMap<QString, QString>> giblyRecord;
giblyRecord.first = giblyId;
giblyRecord.second = attributeValues;
// Add this tuple to our list
queryResults.append(giblyRecord);
}
return queryResults;
}
Class* DynoDB::getClass(QString name)
{
//Return corresponding class with id matching the input string
QString checkClassTableStatement = "SELECT Id FROM `2` WHERE `4` = '%1'";
checkClassTableStatement = checkClassTableStatement.arg(name);
QSqlQuery getClassId = database.exec(checkClassTableStatement);
if (getClassId.next())
{
quint32 foundClassId = getClassId.value(0).toInt();
Class* foundClass = new Class(foundClassId,name);
return foundClass;
}
else return 0;
}
bool DynoDB::initialize()
{
QString checkGibliesTableStatement =
"SELECT Id "
"FROM `%1` "
"WHERE Id = 0";
checkGibliesTableStatement = checkGibliesTableStatement.arg(GIBLY);
database.exec(checkGibliesTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
QString createGibliesTableStatement =
"CREATE TABLE `%1` ("
"Id INT AUTO_INCREMENT PRIMARY KEY) AUTO_INCREMENT=%2";
createGibliesTableStatement = createGibliesTableStatement
.arg((quint16)GIBLY)
.arg((quint16)MAX_DATA_TYPE);
database.exec(createGibliesTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
QString createClassTableStatement =
"CREATE TABLE `%1` ("
"Id INT PRIMARY KEY, "
"`%2` VARCHAR(255), "
"`%3` BOOLEAN DEFAULT false)";
createClassTableStatement = createClassTableStatement
.arg((quint16)CLASS)
.arg((quint16)NAME)
.arg((quint16)HAS_TABLE);
database.exec(createClassTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
QString createLiteralTableStatement =
"CREATE TABLE `%1` ("
"Id INT PRIMARY KEY, "
"`%2` VARCHAR(255), "
"`%3` INT)";
createLiteralTableStatement = createLiteralTableStatement
.arg(LITERAL)
.arg(NAME)
.arg(TYPE);
database.exec(createLiteralTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
QString createInstanceTableStatement =
"CREATE TABLE `%1` ("
"Id INT PRIMARY KEY, "
"`%2` INT)";
createInstanceTableStatement = createInstanceTableStatement
.arg(INSTANCE)
.arg(CLASS);
database.exec(createInstanceTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
QString createRelationTableStatement =
"CREATE TABLE `%1` ("
"Id INT, "
"`%2` INT,"
"`%3` BOOL,"
"`%4` INT,"
"`%5` INT,"
"`%6` INT)";
createRelationTableStatement = createRelationTableStatement
.arg(RELATION)
.arg(CLASS)
.arg(IS_COLUMN)
.arg(GROUP)
.arg(DIRECTION)
.arg(QUANTITY);
database.exec(createRelationTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
quint16 builtInDataTypeIndex = 0;
BuiltInDataType builtInDataType = BuiltInDataTypeValues[builtInDataTypeIndex];
while(builtInDataType != MAX_DATA_TYPE)
{
QString insertGiblyStatement =
"INSERT INTO `%1` (Id) "
"VALUES (%2)";
insertGiblyStatement = insertGiblyStatement
.arg(GIBLY)
.arg(builtInDataType);
database.exec(insertGiblyStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
if(!createClass(builtInDataType, BuiltInDataTypeNames[builtInDataType]))
{
return false;
}
builtInDataType = BuiltInDataTypeValues[++builtInDataTypeIndex];
}
if(!createLiteral(NAME, BuiltInDataTypeNames[NAME], STRING))
{
return false;
}
if(!createLiteral(HAS_TABLE, BuiltInDataTypeNames[HAS_TABLE], BOOL))
{
return false;
}
if(!createLiteral(IS_COLUMN, BuiltInDataTypeNames[IS_COLUMN], BOOL))
{
return false;
}
}
return true;
}
bool DynoDB::createClass(quint32 id, QString name)
{
QString addClassStatement =
"INSERT INTO `%1` (Id, `%2`) "
"VALUES (%3, '%4')";
addClassStatement = addClassStatement
.arg(CLASS)
.arg(NAME)
.arg(id)
.arg(name);
database.exec(addClassStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
return true;
}
bool DynoDB::createLiteral(quint32 id, QString literalName, quint32 typeId)
{
if(!createClass(id, literalName))
{
return false;
}
QString addLiteralStatement =
"INSERT INTO `%1` (Id, `%2`, `%3`) "
"VALUES (%4, '%5', %6)";
addLiteralStatement = addLiteralStatement
.arg(LITERAL)
.arg(NAME)
.arg(TYPE)
.arg(id)
.arg(literalName)
.arg(typeId);
database.exec(addLiteralStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
return true;
}
bool DynoDB::createInstance(quint32 classId, quint32 instanceId)
{
QString addGiblyStatement =
"INSERT INTO `%1` (Id) "
"VALUES (%2)";
addGiblyStatement = addGiblyStatement.arg(classId).arg(instanceId);
database.exec(addGiblyStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
QString addInstanceStatement =
"INSERT INTO `%1` (Id, `%2`) "
"VALUES (%3, %4)";
addInstanceStatement = addInstanceStatement
.arg(INSTANCE)
.arg(CLASS)
.arg(instanceId)
.arg(classId);
database.exec(addInstanceStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
return true;
}
bool DynoDB::hasTable(quint32 classId)
{
QString getClassStatement =
"SELECT `%1` FROM `%2` WHERE Id = %3";
getClassStatement = getClassStatement
.arg(HAS_TABLE)
.arg(CLASS)
.arg(classId);
QSqlQuery getClassQuery = database.exec(getClassStatement);
if(getClassQuery.size() > 0)
{
getClassQuery.first();
return getClassQuery.value(0).toBool();
}
return false;
}
bool DynoDB::hasTable(quint32 relationId, quint32 relationGroupId)
{
QString isColumnStatement =
"SELECT `%1` FROM `%2` WHERE Id = %3 AND `%4` = %5";
isColumnStatement = isColumnStatement
.arg(IS_COLUMN)
.arg(RELATION)
.arg(relationId)
.arg(GROUP)
.arg(relationGroupId);
QSqlQuery isColumnQuery = database.exec(isColumnStatement);
while(isColumnQuery.next())
{
if(!isColumnQuery.value(0).toBool())
{
return true;
}
}
return false;
}
bool DynoDB::makeClassTable(quint32 classId)
{
QString createClassTableStatement =
"CREATE TABLE `%1` (\
Id INT PRIMARY KEY)";
createClassTableStatement = createClassTableStatement.arg(classId);
database.exec(createClassTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
QString updateClassesTableStatement =
"UPDATE `%1` SET `%2` = 1 "
"WHERE Id = %3";
updateClassesTableStatement = updateClassesTableStatement
.arg(CLASS)
.arg(HAS_TABLE)
.arg(classId);
database.exec(updateClassesTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
return true;
}
bool DynoDB::makeRelationTable(quint32 relationId, quint32 relationGroupId)
{
QString createRelationTableStatement =
"CREATE TABLE `%1_%2` (\
Id INT PRIMARY KEY)";
createRelationTableStatement = createRelationTableStatement
.arg(relationId)
.arg(relationGroupId);
database.exec(createRelationTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
QString updateRelationTableStatement =
"UPDATE `%1` SET `%2` = 0 "
"WHERE Id = %3 AND `%4` = %5";
updateRelationTableStatement = updateRelationTableStatement
.arg(RELATION)
.arg(IS_COLUMN)
.arg(relationId)
.arg(GROUP)
.arg(relationGroupId);
database.exec(updateRelationTableStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
return true;
}
quint32 DynoDB::createGibly()
{
QString addGiblyStatement =
"INSERT INTO `%1`() VALUES()";
addGiblyStatement = addGiblyStatement.arg(GIBLY);
QSqlQuery addGiblyQuery = database.exec(addGiblyStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return INVALID_DATA_TYPE;
}
return addGiblyQuery.lastInsertId().toInt();
}
bool DynoDB::deleteGibly(quint32 id)
{
QString deleteGiblyStatement =
"DELETE FROM `%1` WHERE Id = %2";
deleteGiblyStatement = deleteGiblyStatement
.arg(GIBLY)
.arg(id);
database.exec(deleteGiblyStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
return true;
}
bool DynoDB::isClass(quint32 id)
{
QString isClassStatement =
"SELECT Id FROM `%1` WHERE Id = %2";
isClassStatement = isClassStatement
.arg(CLASS)
.arg(id);
QSqlQuery isClassQuery = database.exec(isClassStatement);
if(isClassQuery.size() == 1)
{
return true;
}
return false;
}
bool DynoDB::isLiteral(quint32 id)
{
QString isLiteralStatement =
"SELECT Id FROM `%1` WHERE Id = %2";
isLiteralStatement = isLiteralStatement
.arg(LITERAL)
.arg(id);
QSqlQuery isLiteralQuery = database.exec(isLiteralStatement);
if(isLiteralQuery.size() == 1)
{
return true;
}
return false;
}
bool DynoDB::addRelation(quint32 id, quint32 literalId, QVariant literal)
{
quint32 classId = getClass(id);
if(!relationTypeExists(literalId, classId))
{
if(!registerRelationType(literalId, classId))
{
return false;
}
}
BuiltInDataType literalType = getLiteralType(literalId);
if(!hasColumn(classId, literalId))
{
bool columnAdded = addColumn(classId, literalId, literalType);
if(!columnAdded)
{
return false;
}
}
QString updateRowStatement =
"UPDATE `%1` SET `%2` = %3 WHERE Id = %4";
updateRowStatement = updateRowStatement
.arg(classId)
.arg(literalId);
switch(literalType)
{
case BOOL:
updateRowStatement = updateRowStatement.arg(literal.toBool());
break;
case INTEGER:
updateRowStatement = updateRowStatement.arg(literal.toInt());
break;
case DATETIME:
updateRowStatement = updateRowStatement.arg(literal.toDateTime().toString("'yyyy-MM-dd HH:mm:ss.zzz0'"));
break;
case STRING:
updateRowStatement = updateRowStatement.arg("'" + literal.toString() + "'");
break;
default:
return false;
}
updateRowStatement = updateRowStatement.arg(id);
database.exec(updateRowStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
return true;
}
bool DynoDB::addRelation(quint32 giblyId, quint32 relationId, quint32 relationGroupId, QList<quint32> classIds, QList<quint32> quantities, QList<quint32> giblyIds)
{
// Check whether this table exists
if(!hasTable(relationId, relationGroupId))
{
// If it doesn't, make it
if(!makeRelationTable(relationId, relationGroupId))
{
return false;
}
}
QMap<quint32, quint32> classQuantityMap;
// Check whether this table has these columns
for(qint32 classIndex = 0; classIndex < classIds.size(); classIndex++)
{
quint32 classId = classIds.at(classIndex);
// The index of the last time we added this class in this relation. Default to 0
quint32 classQuantityIndex = 0;
// Check if we have already added this class in this relation
if(classQuantityMap.contains(classId))
{
// If we have, then let's increment the class quantity index
classQuantityIndex = classQuantityMap.value(classId) + 1;
}
// Loop through the quantity of this predicate element
quint32 quantityIndex;
for(quantityIndex = 0; quantityIndex < quantities.at(classIndex); quantityIndex++)
{
if(!hasColumn(relationId, relationGroupId, classId, classQuantityIndex + quantityIndex))
{
if(!addColumn(relationId, relationGroupId, classId, classQuantityIndex + quantityIndex, GIBLY))
{
return false;
}
}
}
classQuantityMap.insert(classId, classQuantityIndex + quantityIndex - 1);
}
classQuantityMap.clear();
QString insertRelationStatement =
"INSERT INTO `%2_%3` (Id, %4) VALUES (%1, %5)";
insertRelationStatement = insertRelationStatement
.arg(giblyId)
.arg(relationId)
.arg(relationGroupId);
QString columnNames;
QString columnValues;
qint32 giblyIndex = 0;
for(qint32 classIndex = 0; classIndex < classIds.size(); classIndex++)
{
quint32 classId = classIds.at(classIndex);
// The index of the last time we added this class in this relation. Default to 0
quint32 classQuantityIndex = 0;
// Check if we have already added this class in this relation
if(classQuantityMap.contains(classId))
{
// If we have, then let's increment the class quantity index
classQuantityIndex = classQuantityMap.value(classId) + 1;
}
quint32 quantityIndex;
for(quantityIndex = 0; quantityIndex < quantities.at(classIndex); quantityIndex++)
{
quint32 giblyId = giblyIds.at(giblyIndex);
columnNames.append("`%1_%2`");
columnNames = columnNames
.arg(classId)
.arg(quantityIndex + classQuantityIndex);
columnValues.append("%1");
columnValues = columnValues.arg(giblyId);
if(giblyIndex != giblyIds.size() - 1)
{
columnNames.append(", ");
columnValues.append(", ");
}
giblyIndex++;
}
classQuantityMap.insert(classId, classQuantityIndex + quantityIndex - 1);
}
insertRelationStatement = insertRelationStatement.arg(columnNames);
insertRelationStatement = insertRelationStatement.arg(columnValues);
database.exec(insertRelationStatement);
if(database.lastError().type() != QSqlError::NoError)
{
return false;
}
return true;
}
quint32 DynoDB::getClass(quint32 id)
{
QString getClassStatement =
"SELECT `%1` FROM `%2` WHERE Id = %3";
getClassStatement = getClassStatement
.arg(CLASS)
.arg(INSTANCE)
.arg(id);
QSqlQuery getClassQuery = database.exec(getClassStatement);
if(getClassQuery.size() > 0)
{
getClassQuery.first();
return getClassQuery.value(0).toInt();
}
return 0;
}
BuiltInDataType DynoDB::getLiteralType(quint32 id)
{
QString getLiteralStatement =
"SELECT `%1` FROM `%2` WHERE Id = %3";