The SelectStatement class is designed for easy manipulation of SQL SELECT statements. It allows you to perform the following tasks:

• Construct SELECT statements in run time;
• Modify the statements with object-oriented interface;
• Parse the statements from strings.

To obtain the statement text use the ToString method.

Instances of this class cannot be created directly. To use its functionality, one needs to create an object of a descendant class, like OracleSelectStatement.

This example illustrates how to construct in run time a SelectStatement object the represents the following query:

SELECT Test.td.dname AS Department,td.loc AS Location,te.ename AS Name 
FROM Test.dept AS td,emp AS te 
GROUP BY te.empno
ORDER BY te.ename

SelectStatement stmt = (SelectStatement) new OracleSelectStatement();      

stmt.Columns.Add(new SelectColumn("test", "td", "dname", "Department"));
stmt.Columns.Add(new SelectColumn("", "td", "loc", "Location"));
stmt.Columns.Add(new SelectColumn("", "te", "ename", "Name"));

stmt.Tables.Add(new SelectTable("test", "dept", "td"));
stmt.Tables.Add(new SelectTable("", "emp", "te"));

stmt.GroupBy.Add(new SelectColumn("", "te", "empno", ""));

stmt.OrderBy.Add(new SelectColumn("", "te", "ename", ""));

Dim stmt As SelectStatement = New OracleSelectStatement()

stmt.Columns.Add(New SelectColumn("test", "td", "dname", "Department"))
stmt.Columns.Add(New SelectColumn("", "td", "loc", "Location"))
stmt.Columns.Add(New SelectColumn("", "te", "ename", "Name"))

stmt.Tables.Add(New SelectTable("test", "dept", "td"))
stmt.Tables.Add(New SelectTable("", "emp", "te"))

stmt.GroupBy.Add(New SelectColumn("", "te", "empno", ""))

stmt.OrderBy.Add(New SelectColumn("", "te", "ename", ""))

System.Object
   Devart.Common.SelectStatement
      Devart.Data.Oracle.OracleSelectStatement

Reference

SelectStatement Members
Devart.Common Namespace