private static Tuple <string, Param[], List <object> > GetCommitStatement(ChangeNode rootNode, DbConnection connection)
{
var dialect = DialectFactory.GetProvider(connection);
var dataEntities = new List <object>();
var sql = new StringBuilder();
var statementId = 0;
// Inserts
var newNodes = GetChanges(rootNode, ObjectState.New);
var tableCreated = false;
var tempTableName = dialect.GetTemporaryTableName("ID");
var allParameters = new List <Param>();
foreach (var newNode in newNodes.Where(n => n.IsObject))
{
var item = newNode.Value;
if (item != null)
{
dataEntities.Add(item);
}
else
{
continue;
}
var objectType = newNode.Value.GetType();
var propertyMap = Reflector.GetPropertyMap(objectType);
var autoGenProperty = propertyMap.Where(p => p.Key.CanWrite && p.Value != null && p.Value.IsAutoGenerated).Select(p => p.Key).FirstOrDefault();
var autoGenType = DbType.String;
if (!tableCreated)
{
if (autoGenProperty != null)
{
autoGenType = Reflector.ClrToDbType(autoGenProperty.PropertyType);
}
sql.AppendFormat(dialect.CreateTemporaryTable("ID", new Dictionary <string, DbType> {
{ "StatementId", DbType.Int32 }, { "GeneratedId", autoGenType }, { "ParameterName", DbType.AnsiString }, { "PropertyName", DbType.AnsiString }
})).AppendLine();
tableCreated = true;
}
var parameters = ObjectExtensions.GetInsertParameters(newNode.Value, propertyMap, statementId);
allParameters.AddRange(parameters);
if (parameters.Length > 0)
{
string commandName = SqlBuilder.GetInsertStatement(objectType, parameters, dialect);
var autoGenParameter = parameters.FirstOrDefault(p => p.IsAutoGenerated);
if (autoGenParameter != null)
{
sql.AppendFormat(dialect.DeclareVariable(autoGenParameter.Name, autoGenType)).AppendLine();
sql.AppendFormat(dialect.AssignVariable(autoGenParameter.Name, autoGenParameter.Type.GetDefault())).AppendLine();
}
sql.AppendLine(commandName);
if (autoGenParameter != null)
{
sql.AppendFormat(dialect.ComputeAutoIncrement(autoGenParameter.Name, () => SqlBuilder.GetTableNameForSql(objectType, dialect))).AppendLine();
sql.AppendFormat("INSERT INTO " + tempTableName + " ({4}StatementId{5}, {4}GeneratedId{5}, {4}ParameterName{5}, {4}PropertyName{5}) VALUES ({0}, {1}, '{2}', '{3}')", statementId, dialect.EvaluateVariable(dialect.ParameterPrefix + autoGenParameter.Name), autoGenParameter.Name, autoGenProperty.Name, dialect.IdentifierEscapeStartCharacter, dialect.IdentifierEscapeEndCharacter).AppendLine();
}
statementId++;
}
}
if (newNodes.Count > 0)
{
sql.AppendLine("SELECT * FROM " + tempTableName);
}
if (tableCreated && !dialect.SupportsTemporaryTables)
{
sql.AppendLine("DROP TABLE " + tempTableName);
}
// Updates
var dirtyNodes = GetChanges(rootNode, ObjectState.Dirty);
var dirtyNodeParents = dirtyNodes.Where(n => n.IsSimpleLeaf).Select(n => n.Parent).Distinct();
foreach (var dirtyNode in dirtyNodeParents)
{
var objectType = dirtyNode.Value.GetType();
var propertyMap = Reflector.GetPropertyMap(objectType).ToDictionary(p => p.Key.Name, p => p);
var parameters = new List <Param>();
foreach (var change in dirtyNode.Nodes.Where(n => n.IsSimpleLeaf))
{
KeyValuePair <PropertyInfo, ReflectedProperty> map;
if (propertyMap.TryGetValue(change.PropertyName, out map))
{
var property = map.Key;
var parameterName = change.PropertyName;
if (map.Value != null && !string.IsNullOrEmpty(map.Value.ParameterName))
{
parameterName = map.Value.ParameterName;
}
parameters.Add(new Param {
Name = parameterName + "_" + statementId, Value = change.Value, Source = MapColumnAttribute.GetMappedColumnName(property)
});
}
}
var primaryKey = new List <Param>();
foreach (var primaryKeyMap in propertyMap.Values.Where(p => p.Value.IsPrimaryKey))
{
var value = dirtyNode.Value.Property(primaryKeyMap.Key.Name);
var parameterName = primaryKeyMap.Key.Name;
if (primaryKeyMap.Value != null && !string.IsNullOrEmpty(primaryKeyMap.Value.ParameterName))
{
parameterName = primaryKeyMap.Value.ParameterName;
}
primaryKey.Add(new Param {
Name = parameterName + "_" + statementId, Value = value, Source = MapColumnAttribute.GetMappedColumnName(primaryKeyMap.Key)
});
}
var commandName = SqlBuilder.GetUpdateStatement(objectType, parameters, primaryKey, dialect);
allParameters.AddRange(parameters);
allParameters.AddRange(primaryKey);
sql.Append(commandName).AppendLine();
statementId++;
}
// Deletes
var deletedNodes = GetChanges(rootNode, ObjectState.Deleted);
foreach (var deletedNode in deletedNodes)
{
var objectType = deletedNode.Value.GetType();
var propertyMap = Reflector.GetPropertyMap(objectType);
var parameters = ObjectExtensions.GetDeleteParameters(deletedNode.Value, propertyMap, statementId);
var commandName = SqlBuilder.GetDeleteStatement(objectType, parameters, dialect);
allParameters.AddRange(parameters);
sql.Append(commandName).AppendLine();
statementId++;
}
return(Tuple.Create(sql.ToString(), allParameters.ToArray(), dataEntities));
}