PgSqlScript Class

In This Topic

Syntax
Remarks
Example
Inheritance Hierarchy
See Also

Serves to execute series of SQL statements separated by special symbols.

Syntax

Visual Basic
C#

public class PgSqlScript : Devart.Common.DbScript, System.ComponentModel.IComponent, System.IDisposable

'Declaration
 
Public Class PgSqlScript 
   Inherits Devart.Common.DbScript
   Implements System.ComponentModel.IComponent, System.IDisposable

Remarks

Often it is necessary to execute several SQL statements one by one. It can be performed by using a lot of components such as PgSqlCommand. Usually it isn't a good solution. With only one PgSqlScript component you can execute several SQL statements as one. This sequence of statements is named script. To separate individual statements use semicolon (;) symbol.

When PgSqlScript encounters a BEGIN keyword in the script, it looks for a slash symbol "/" in the first position of some consecutive line. Everything between the BEGIN and the slash is considered single block. Usually the slash is placed after the line containing END keyword. You do not have to place slash after nested BEGIN...END block.

Example

This sample demonstrates how to execute script and retrieve information about execution flow using Progress and Error events.

csharp

[STAThread]
static void Main(string[] args)
{
string script =

  "INSERT INTO DEPT VALUES (10,'ACCOUNTING','NEW YORK');"+
  "INSERT INTO DEPT VALUES (20,'RESEARCH','DALLAS');"+
  "INSERT INTO DEPT VALUES (30,'SALES','CHICAGO');"+
  "INSERT INTO DEPT VALUES (40,'OPERATIONS','BOSTON');"+
  "SELECT * FROM DEPT";
      PgSqlConnection pgConn = new PgSqlConnection(
          "host=server;database=test;user id=postgres;");
      PgSqlScript pgScript = new PgSqlScript(script,pgConn);
      pgScript.Progress += new Devart.Common.ScriptProgressEventHandler(OnProgress);
      pgScript.Error += new Devart.Common.ScriptErrorEventHandler(OnError);
      pgConn.Open();
      pgScript.Execute();
      pgConn.Close();
    }

static void OnProgress(object sender, Devart.Common.ScriptProgressEventArgs e)
{
  Console.WriteLine(e.Text);
  Console.WriteLine("  Successfully executed.");
}

static void OnError(object sender, Devart.Common.ScriptErrorEventArgs e)
{
  e.Ignore = true;
  Console.WriteLine(e.Text);
  Console.WriteLine("  Failed.");
}

Visual Basic

Module Module1

  Friend WithEvents pgScript As Devart.Data.PostgreSql.PgSqlScript

  Sub Main()
    Dim script As String = _

  "INSERT INTO DEPT VALUES (10,'ACCOUNTING','NEW YORK');" + _
  "INSERT INTO DEPT VALUES (20,'RESEARCH','DALLAS');" + _
  "INSERT INTO DEPT VALUES (30,'SALES','CHICAGO');" + _
  "INSERT INTO DEPT VALUES (40,'OPERATIONS','BOSTON');" + _
  "SELECT * FROM DEPT"
    Dim pgConn As PgSqlConnection = New PgSqlConnection( _
        "host=server;database=test;user id=postgres;")
    pgScript = New PgSqlScript(script, pgConn)
    pgConn.Open()
    pgScript.Execute()
    pgConn.Close()
    Console.ReadLine()
  End Sub

  Sub OnProgress(ByVal sender As Object, ByVal e As Devart.Common.ScriptProgressEventArgs) Handles pgScript.Progress
    Console.WriteLine(e.Text)
    Console.WriteLine("  Successfully executed.")
  End Sub

  Sub OnError(ByVal sender As Object, ByVal e As Devart.Common.ScriptErrorEventArgs) Handles pgScript.Error
    e.Ignore = True
    Console.WriteLine(e.Text)
    Console.WriteLine("  Failed.")
  End Sub

End Module

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         Devart.Common.DbScript
            Devart.Data.PostgreSql.PgSqlScript

Reference

PgSqlScript Members
Devart.Data.PostgreSql Namespace
PgSqlCommand Class

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