/// <summary>
/// Creates a SqlExpression with an aggergation function
/// </summary>
/// <param name="func">Aggregation function to be applied on the supplied expression</param>
/// <param name="param">Parameter of the aggregation function</param>
/// <returns></returns>
public static SqlExpression Function(SqlAggregationFunction func, SqlExpression param)
{
SqlExpression expr = new SqlExpression();
expr.type = SqlExpressionType.Function;
expr.subExpr1 = param;
expr.func = func;
return(expr);
}
public SelectColumn(string columnName, FromTerm table, SqlAggregationFunction function)
{
if (function == SqlAggregationFunction.None)
{
expr = SqlExpression.Field(columnName, table);
}
else
{
expr = SqlExpression.Function(function, SqlExpression.Field(columnName, table));
}
}
public SelectColumn(string columnName, FromTerm table, SqlAggregationFunction function)
{
if (function == SqlAggregationFunction.None)
{
expr = SqlExpression.Field(columnName, table);
}
else
{
expr = SqlExpression.Function(function, SqlExpression.Field(columnName, table));
}
}
public SelectColumn(string columnName, FromTerm table, string columnAlias, SqlAggregationFunction function)
{
if (function == SqlAggregationFunction.None)
{
this.expr = SqlExpression.Field(columnName, table);
}
else
{
this.expr = SqlExpression.Function(function, SqlExpression.Field(columnName, table));
}
this.alias = columnAlias;
}
/// <summary>
/// Creates a SelectColumn with a column name, table, column alias and optional aggregation function
/// </summary>
/// <param name="columnName">Name of a column</param>
/// <param name="table">The table this OtherData belongs to</param>
/// <param name="columnAlias">Alias of the column</param>
/// <param name="function">Aggregation function to be applied to the column. Use SqlAggregationFunction.None to specify that no function should be applied.</param>
public SelectColumn(string columnName, FromTerm table, string columnAlias, SqlAggregationFunction function)
{
_table = table;
if (function == SqlAggregationFunction.None)
{
expr = SqlExpression.Field(columnName, table);
}
else
{
expr = SqlExpression.Function(function, SqlExpression.Field(columnName, table));
}
this.alias = columnAlias;
}
/// <summary>
/// Renders a SqlExpression of type Function
/// </summary>
/// <param name="builder"></param>
/// <param name="func"></param>
/// <param name="param"></param>
protected virtual void Function(StringBuilder builder, SqlAggregationFunction func, SqlExpression param)
{
builder.AppendFormat("{0}(", func.ToString());
Expression(builder, param);
builder.AppendFormat(")");
}
/// <summary>
/// Renders a SqlExpression of type Function
/// </summary>
/// <param name="builder"></param>
/// <param name="func"></param>
/// <param name="param"></param>
protected virtual void Function(StringBuilder builder, SqlAggregationFunction func, SqlExpression param)
{
builder.AppendFormat("{0}(", func.ToString());
Expression(builder, param);
builder.AppendFormat(")");
}
public static SqlExpression Function(SqlAggregationFunction func, SqlExpression param)
{
SqlExpression expression = new SqlExpression();
expression.type = SqlExpressionType.Function;
expression.subExpr1 = param;
expression.func = func;
return expression;
}
public SelectColumn(Enum columnName, FromTerm table, SqlAggregationFunction function) : this(columnName.ToString(), table, function) {}
public SelectColumn(Enum columnName, FromTerm table, SqlAggregationFunction function) : this(columnName.ToString(), table, function)
{
}
