public IList <IList <string> > EvaluateColumnDataType(TableColumn column, DatabaseObject table)
{
IList <IList <string> > result = new List <IList <string> >();
result.Add(new List <string>()
{
"Datatype:",
column.TypeWithLength
});
if (column.IsUserType)
{
result.Add(new List <string>()
{
"Suggestion:",
"It is a user defined type so optimal data type is not resolved"
});
}
else if (column.DataTypeIsChar() || column.DataTypeIsBinary())
{
Tuple <long, long> minMax = _databaseOperations.GetMinMaxColumnValues(column, table);
result.Add(new List <string>
{
"Max length in values:",
minMax.Item2.ToString()
});
if (minMax.Item2 < column.Length)
{
result.Add(new List <string>
{
"Max length which can be stored:",
column.Length.ToString(),
});
result.Add(new List <string>
{
"Suggestion:",
$"Bytes can be lowered from {column.Length} to {Math.Max(minMax.Item2, DataTypeConstants.MIN_LENGTH_IN_BYTES)} => {column.Type}({Math.Max(minMax.Item2, DataTypeConstants.MIN_LENGTH_IN_BYTES)})"
});
}
else if (column.Length == -1 && minMax.Item2 <= column.MaxLength)
{
result.Add(new List <string>
{
"Suggestion:",
$"Bytes can be lowered from MAX to {minMax.Item2} => {column.Type}({minMax.Item2})"
});
}
else
{
result.Add(new List <string>
{
"No suggestion"
});
}
}
else if (column.DataTypeIsInteger())
{
Tuple <long, long> minMax = _databaseOperations.GetMinMaxColumnValues(column, table);
Tuple <long, long> minMaxDataType;
switch (column.Type)
{
case DataTypeConstants.TINYINT:
minMaxDataType = new Tuple <long, long>(DataTypeConstants.TINYINT_MIN_VALUE, DataTypeConstants.TINYINT_MAX_VALUE);
break;
case DataTypeConstants.SMALLINT:
minMaxDataType = new Tuple <long, long>(DataTypeConstants.SMALLINT_MIN_VALUE, DataTypeConstants.SMALLINT_MAX_VALUE);
break;
case DataTypeConstants.INT:
minMaxDataType = new Tuple <long, long>(DataTypeConstants.INT_MIN_VALUE, DataTypeConstants.INT_MAX_VALUE);
break;
case DataTypeConstants.BIGINT:
minMaxDataType = new Tuple <long, long>(DataTypeConstants.BIGINT_MIN_VALUE, DataTypeConstants.BIGINT_MAX_VALUE);
break;
default:
result.Add(new List <string> {
"Unknown integer value"
});
return(result);
}
result.Add(new List <string>
{
"Min value in values:",
minMax.Item1.ToString()
});
result.Add(new List <string>
{
"Max value in values:",
minMax.Item2.ToString()
});
if (minMax.Item1 >= DataTypeConstants.TINYINT_MIN_VALUE && minMax.Item2 <= DataTypeConstants.TINYINT_MAX_VALUE)
{
result.Add(GenerateSuggestionForIntDataType(column, minMaxDataType, DataTypeConstants.TINYINT, DataTypeConstants.TINYINT_MIN_VALUE, DataTypeConstants.TINYINT_MAX_VALUE));
}
else if (minMax.Item1 >= DataTypeConstants.SMALLINT_MIN_VALUE && minMax.Item2 <= DataTypeConstants.SMALLINT_MAX_VALUE)
{
result.Add(GenerateSuggestionForIntDataType(column, minMaxDataType, DataTypeConstants.SMALLINT, DataTypeConstants.SMALLINT_MIN_VALUE, DataTypeConstants.SMALLINT_MAX_VALUE));
}
else if (minMax.Item1 >= DataTypeConstants.INT_MIN_VALUE && minMax.Item2 <= DataTypeConstants.INT_MAX_VALUE)
{
result.Add(GenerateSuggestionForIntDataType(column, minMaxDataType, DataTypeConstants.INT, DataTypeConstants.INT_MIN_VALUE, DataTypeConstants.INT_MAX_VALUE));
}
else // It must be in range of bigint, no need to check it and no suggestion (cannot be used smaller data type)
{
result.Add(new List <string>
{
"No suggestion"
});
}
}
else
{
result.Add(new List <string>
{
"No suggestion for this data type"
});
}
return(result);
}
public bool ArchiveTable(DatabaseObject tableToArchive, IDictionary <string, string> convertorTablenames, bool createTable, string whereConditions, bool useInsertIntoSelect, bool archiveAllEntries, StreamWriter streamToSave)
{
bool exportIsNotEmpty = false;
ISet <DependencyEdge> cycleEdges;
IList <DependencyNode> orderedTables = DependencyGraph.GetTopologicallySortedNodes(tableToArchive, true, out cycleEdges);
if (createTable)
{
Server server = new Server(new ServerConnection(Database.Instance.Connection));
Microsoft.SqlServer.Management.Smo.Database database = server.Databases[Database.Instance.DatabaseName];
Transfer transfer = new Transfer(database)
{
CopyAllObjects = false,
CopyAllUserDefinedDataTypes = true,
CopyAllSchemas = true,
CopyAllXmlSchemaCollections = true,
Options = new ScriptingOptions
{
FullTextCatalogs = true,
FullTextStopLists = true,
FullTextIndexes = true,
DriAll = true,
ExtendedProperties = true,
Indexes = true,
NonClusteredIndexes = true,
Triggers = true,
IncludeIfNotExists = true
}
};
foreach (DependencyNode table in orderedTables)
{
transfer.ObjectList.Add(database.Tables[table.DbObject.Name, table.DbObject.Schema]);
}
StringBuilder archiveCreateTable = new StringBuilder();
foreach (string line in transfer.ScriptTransfer())
{
archiveCreateTable.AppendLine(line);
archiveCreateTable.AppendLine("GO");
}
foreach (DependencyNode table in orderedTables)
{
archiveCreateTable.Replace(table.DbObject.NameWithSchemaBrackets, table.DbObject.NameWithSchema.Replace(table.DbObject.NameWithSchemaBrackets, $"[{convertorTablenames[table.DbObject.NameWithSchema.ToLower()].Replace(".", "].[")}]"));
archiveCreateTable.Replace($"TABLE {table.DbObject.NameWithSchema}", $"TABLE {convertorTablenames[table.DbObject.NameWithSchema.ToLower()]}");
archiveCreateTable.Replace($"ON {table.DbObject.NameWithSchema}", $"ON {convertorTablenames[table.DbObject.NameWithSchema.ToLower()]}");
string oldTablename = table.DbObject.Name;
string newTablename = convertorTablenames[table.DbObject.NameWithSchema.ToLower()];
newTablename = newTablename.Substring(Math.Min(newTablename.LastIndexOf(".") + 1, newTablename.Length - 1)).Replace("[", "").Replace("]", "");
archiveCreateTable.Replace($"_{oldTablename}_", $"_{newTablename}_");
archiveCreateTable.Replace($"name=N'{oldTablename}'", $"name=N'{newTablename}'");
}
streamToSave.Write(archiveCreateTable.ToString());
exportIsNotEmpty = true;
archiveCreateTable.Clear();
}
IDictionary <DependencyNode, string> tableSubSelects = new Dictionary <DependencyNode, string>(orderedTables.Count);
if (!archiveAllEntries)
{
foreach (DependencyNode table in orderedTables.Reverse())
{
if (table.DbObject.Equals(tableToArchive))
{
tableSubSelects.Add(table, $"FROM {table.DbObject.NameWithSchemaBrackets}{(whereConditions.Trim().Length > 0 ? $" WHERE {whereConditions}" : "")}");
}
foreach (DependencyEdge edge in table.ParentEdges)
{
DependencyNode parent = edge.Parent;
if (parent.DbObject.Equals(tableToArchive))
{
continue;
}
if (orderedTables.Contains(parent))
{
IList <string> parentColumnsConditions = new List <string>();
foreach (DependencyColumn column in edge.Columns)
{
parentColumnsConditions.Add($"{parent.DbObject.NameWithSchemaBrackets}.[{column.ParentColumn}] IN (SELECT DISTINCT {table.DbObject.NameWithSchemaBrackets}.[{column.ChildColumn}] {tableSubSelects[edge.Child]})");
}
if (!tableSubSelects.ContainsKey(parent))
{
tableSubSelects[parent] = $"FROM {parent.DbObject.NameWithSchemaBrackets} WHERE ({string.Join(" AND ", parentColumnsConditions)})";
}
else
{
tableSubSelects[parent] = tableSubSelects[parent] + $" OR ({string.Join(" AND ", parentColumnsConditions)})";
}
}
}
}
}
else
{
foreach (DependencyNode table in orderedTables)
{
if (table.DbObject.Equals(tableToArchive) && whereConditions.Trim().Length > 0)
{
tableSubSelects.Add(table, $"FROM {table.DbObject.NameWithSchemaBrackets} WHERE {whereConditions}");
}
else
{
tableSubSelects.Add(table, $"FROM {table.DbObject.NameWithSchemaBrackets}");
}
}
}
IDictionary <DependencyNode, bool> valuesInTables = new Dictionary <DependencyNode, bool>(orderedTables.Count);
bool valuesGenerated = false;
foreach (DependencyNode table in orderedTables)
{
valuesInTables[table] = (Database.Instance.ExecuteScalarSelect($"SELECT COUNT(*) {tableSubSelects[table]}") ?? 0) > 0;
if (valuesInTables[table])
{
valuesGenerated = true;
}
}
StringBuilder noCheckConstraints = new StringBuilder();
StringBuilder witchCheckConstraints = new StringBuilder();
foreach (DependencyEdge edge in cycleEdges)
{
noCheckConstraints.AppendLine($"ALTER TABLE {edge.Child.DbObject.NameWithSchemaBrackets} NOCHECK CONSTRAINT {edge.Name};");
witchCheckConstraints.AppendLine($"ALTER TABLE {edge.Child.DbObject.NameWithSchemaBrackets} WITH CHECK CHECK CONSTRAINT {edge.Name};");
}
if (valuesGenerated || useInsertIntoSelect)
{
streamToSave.Write(noCheckConstraints.ToString());
}
foreach (DependencyNode table in orderedTables)
{
string tableName = convertorTablenames[table.DbObject.NameWithSchema.ToLower()];
if (!tableName.Contains("[") && !tableName.Contains("]"))
{
tableName = "[" + tableName.Replace(".", "].[") + "]";
}
IList <string> columnsList = _databaseOperations.GetColumnNames(table.DbObject, false);
string columns = "[" + string.Join("], [", columnsList) + "]";
if (!useInsertIntoSelect || table.DbObject.NameWithSchema == convertorTablenames[table.DbObject.NameWithSchema.ToLower()])
{
if (!valuesInTables[table])
{
continue;
}
if (_databaseOperations.HasTableIdentityColumn(table.DbObject))
{
streamToSave.WriteLine($"SET IDENTITY_INSERT {tableName} ON;");
}
int values = 0;
foreach (string insert in new DatabaseOperations.ValueInsertGetter($"SELECT {columns} {tableSubSelects[table]}"))
{
if (values % MAX_VALUES_IN_INSERT == 0)
{
if (values > 0)
{
streamToSave.WriteLine(";");
streamToSave.WriteLine("GO");
}
streamToSave.Write($"INSERT INTO {tableName} ({columns}) VALUES ");
}
else
{
streamToSave.Write(", ");
}
streamToSave.Write(insert);
values++;
}
if (values > 0)
{
streamToSave.WriteLine(";");
streamToSave.WriteLine("GO");
}
if (_databaseOperations.HasTableIdentityColumn(table.DbObject))
{
streamToSave.WriteLine($"SET IDENTITY_INSERT {tableName} OFF;");
}
}
else
{
exportIsNotEmpty = true;
if (_databaseOperations.HasTableIdentityColumn(table.DbObject))
{
streamToSave.WriteLine($"SET IDENTITY_INSERT {tableName} ON;");
}
streamToSave.WriteLine($"INSERT INTO {tableName} ({columns}) SELECT * {tableSubSelects[table]};");
}
}
if (valuesGenerated || useInsertIntoSelect)
{
exportIsNotEmpty = true;
streamToSave.Write(witchCheckConstraints.ToString());
}
streamToSave.Flush();
return(exportIsNotEmpty);
}
public string DeleteEntriesFromTable(DatabaseObject tableWhereDelete, string whereConditions, IDictionary <DB.ForeignKey, DB.ForeignKey.DeleteActions> foreignKeyActions)
{
StringBuilder delete = new StringBuilder();
DependencyNode startTable = DependencyGraph[tableWhereDelete];
IList <DependencyNode> orderedTables = new List <DependencyNode>();
IDictionary <DependencyNode, IList <DependencyEdge> > childEdges = new Dictionary <DependencyNode, IList <DependencyEdge> >();
childEdges[startTable] = new List <DependencyEdge>();
foreach (DependencyNode table in DependencyGraph.GetDescendants(tableWhereDelete))
{
childEdges[table] = new List <DependencyEdge>();
}
ISet <DependencyNode> processing = new HashSet <DependencyNode>();
ISet <DependencyNode> processed = new HashSet <DependencyNode>();
ProccessDeleteSubhierarchy(startTable, null, orderedTables, childEdges, foreignKeyActions, processing, processed);
IList <string> queries = new List <string>();
IDictionary <DependencyNode, string> tableSubSelects = new Dictionary <DependencyNode, string>(orderedTables.Count);
foreach (DependencyNode table in orderedTables.Reverse())
{
if (table.DbObject.Equals(tableWhereDelete))
{
tableSubSelects.Add(table, $"{(whereConditions.Trim().Length > 0 ? $" WHERE {whereConditions}" : "")}");
queries.Add($"DELETE FROM {tableWhereDelete.NameWithSchemaBrackets} {tableSubSelects[table]}");
}
foreach (DependencyEdge edge in childEdges[table])
{
DependencyNode child = edge.Child;
IList <string> childColumnsConditions = new List <string>();
foreach (DependencyColumn column in edge.Columns)
{
childColumnsConditions.Add($"{child.DbObject.NameWithSchemaBrackets}.[{column.ChildColumn}] IN (SELECT DISTINCT {table.DbObject.NameWithSchemaBrackets}.[{column.ParentColumn}] FROM {edge.Parent.DbObject.NameWithSchemaBrackets} {tableSubSelects[edge.Parent]})");
}
if (!tableSubSelects.ContainsKey(child))
{
tableSubSelects[child] = $"WHERE ({string.Join(" OR ", childColumnsConditions)})";
}
else if (!child.DbObject.Equals(tableWhereDelete))
{
tableSubSelects[child] = tableSubSelects[child] + $" OR ({string.Join(" OR ", childColumnsConditions)})";
}
if (foreignKeyActions[edge.ForeignKey] == DB.ForeignKey.DeleteActions.Cascade)
{
queries.Add($"DELETE FROM {child.DbObject.NameWithSchemaBrackets} {tableSubSelects[child]}");
}
else if (foreignKeyActions[edge.ForeignKey] == DB.ForeignKey.DeleteActions.SetNull)
{
IList <string> setColumns = new List <string>();
foreach (DependencyColumn column in edge.Columns)
{
setColumns.Add($"{child.DbObject.NameWithSchemaBrackets}.[{column.ChildColumn}] = NULL");
}
queries.Add($"UPDATE {child.DbObject.NameWithSchemaBrackets} SET {string.Join(", ", setColumns)} {tableSubSelects[child]}");
}
else if (foreignKeyActions[edge.ForeignKey] == DB.ForeignKey.DeleteActions.SetDefault)
{
IList <string> setColumns = new List <string>();
foreach (DependencyColumn column in edge.Columns)
{
string defaultValue = column.ChildColumn.DefaultValue;
if (defaultValue == null)
{
defaultValue = "NULL";
}
setColumns.Add($"{child.DbObject.NameWithSchemaBrackets}.[{column.ChildColumn}] = {defaultValue}");
}
queries.Add($"UPDATE {child.DbObject.NameWithSchemaBrackets} SET {string.Join(", ", setColumns)} {tableSubSelects[child]}");
}
}
}
delete.AppendLine("BEGIN TRY").AppendLine("BEGIN TRANSACTION");
foreach (string query in queries.Reverse())
{
delete.Append(query).AppendLine(";");
}
delete.AppendLine("COMMIT").AppendLine("END TRY").AppendLine("BEGIN CATCH");
delete.AppendLine("IF @@TRANCOUNT > 0").AppendLine("ROLLBACK TRAN");
delete.AppendLine("DECLARE @ErrorMessage NVARCHAR(4000) = ERROR_MESSAGE()");
delete.AppendLine("DECLARE @ErrorSeverity INT = ERROR_SEVERITY()");
delete.AppendLine("DECLARE @ErrorState INT = ERROR_STATE()");
delete.AppendLine("RAISERROR (@ErrorMessage, @ErrorSeverity, @ErrorState); ");
delete.AppendLine("END CATCH");
return(delete.ToString());
}