void IDBTraits.ModifyColumn(Func <DbCommand> commandCreator, ColumnDescription description)
{
using (DbCommand command = commandCreator()) {
command.CommandText = _SQLQueryManager.ModifyColumnPostgresStyle(description);
ExecuteNonQuery(command);
}
}
/// <summary>
/// It seems that this feature is not mentioned in any SQL standart and is only implemented in Oracle and MySQL.
/// However, it is similar to other SQL language structures, so it should be implemented in SQLQueryManager, not OracleDBTraits
/// </summary>
private string _ModifyColumnDefinitionOracleStyle(ColumnDescription description)
{
return(string.Format(
"modify ({0})",
_ColumnDefinition(description, ColumnSpecific.None, Specific.OracleNullExtension)
));
}
/// <summary>
/// SQL-92, page 284
/// </summary>
private string _AddColumnDefinition(ColumnDescription description)
{
return(string.Format(
"add {0}",
_ColumnDefinition(description, ColumnSpecific.None, Specific.None)
));
}
void IDBTraits.CreateColumn(Func <DbCommand> commandCreator, ColumnDescription description)
{
using (DbCommand command = commandCreator())
{
command.CommandText = _SQLQueryManager.CreateColumn(description);
command.ExecuteNonQuery();
}
}
void IDBTraits.ModifyColumn(Func <DbCommand> commandCreator, ColumnDescription description)
{
using (DbCommand command = commandCreator())
{
command.CommandText = _SQLQueryManager.ModifyColumnOracleStyle(description);
Console.WriteLine();
Console.WriteLine(command.CommandText);
command.ExecuteNonQuery();
}
}
/// <summary>
/// SQL-92, page 262<br/>
/// Note that setting oracleNullExtension to true will make the query non-compliant
/// </summary>
private string _ColumnDefinition(ColumnDescription description, ColumnSpecific columnSpecific, Specific specific)
{
return(string.Format(
"{0} {1} {2} {3} {4}",
nameEscaper(description.column.columnName), //column name
description.options.type, //data type | domain name
(description.options.defaultValue != null) ? "DEFAULT " + description.options.defaultValue : "", //NOTE possible SQL injection here! //default clause
String.Join(
" ",
Enumerable.Empty <string>()
.ConcatScalar(description.options.isNotNull ? "NOT NULL" : ((specific & Specific.OracleNullExtension) == Specific.OracleNullExtension ? "NULL" : null))
.ConcatScalar((columnSpecific & ColumnSpecific.PrimaryKey) == ColumnSpecific.PrimaryKey ? "PRIMARY KEY" : null)
.ToArray()
), //column constraint definition
"" //collate clause
));
}
public TableDescription(string table, ColumnDescription primaryKey, IEnumerable <ColumnDescription> columns)
: this(table, primaryKey, columns.ToArray())
{
}
public TableDescription(string table, ColumnDescription primaryKey, params ColumnDescription[] columns)
{
this.table = table;
this.primaryKey = primaryKey;
this.columns = columns;
}
public string ModifyColumnPostgresStyle(ColumnDescription description)
{
return(_AlterTableStatement(description.column.tableName, _ModifyColumnDefinitionPostgresStyle(description)));
}
public string CreateColumn(ColumnDescription description)
{
return(_AlterTableStatement(description.column.tableName, _AddColumnDefinition(description)));
}
private string _ModifyColumnDefinitionPostgresStyle(ColumnDescription description)
{
throw new NotImplementedException();
}
public void ModifyColumn(ColumnDescription description)
{
this.traits.ModifyColumn(this.CreateTextCommand, description);
}
