dotConnect for PostgreSQL Documentation
Devart.Common Namespace / SqlStatement Class
Members Example

In This Topic
    SqlStatement Class
    In This Topic
    Represents a single statement in a script.
    Syntax
    'Declaration
     
    Public Class SqlStatement 
    public class SqlStatement 
    Remarks

    Use SqlStatement to execute individual statements in a script. Each SqlStatement object contains SQL text and information about location of statement in the whole script.

    SqlStatement object can be obtained through DbScript.Statements collection. After originating ScriptText has been modified any obsolete SqlStatement objects can no longer be used.

    Example
    This sample shows how to retrieve collection of statements that make up the script and execute them one by one.
    string script =
      "DROP TABLE DEPT;"+
      "CREATE TABLE DEPT ("+
      "  DEPTNO INT PRIMARY KEY,"+
      "  DNAME VARCHAR(14),"+
      "  LOC VARCHAR(13)"+
      ")WITH OIDS;"+
      "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);
    SqlStatementCollection pgColl = pgScript.Statements;
    IDataReader pgReader;
    pgConn.Open();
    foreach (SqlStatement pgStatement in pgColl)
    {
      Console.WriteLine(pgStatement.Text);
      try
      {
        pgReader = pgStatement.Execute();
        Console.WriteLine("  Records affected " + pgReader.RecordsAffected); 
        while (pgReader.Read()) 
        { 
          Console.WriteLine(pgReader.GetString(0)); 
        } 
        pgReader.Close(); 
        Console.WriteLine();
      }
      catch
      {
        Console.WriteLine("  Failed");
      }
    }
    pgConn.Close();
    Dim script As String = _
      "DROP TABLE DEPT;" & _
      "CREATE TABLE DEPT (" & _
      "  DEPTNO INT PRIMARY KEY," & _
      "  DNAME VARCHAR(14)," & _
      "  LOC VARCHAR(13)" & _
      ")WITH OIDS;" & _
        "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;")
    Dim pgScript As PgSqlScript = New PgSqlScript(script, pgConn)
    Dim pgColl As SqlStatementCollection = pgScript.Statements
    Dim pgReader As IDataReader
    pgConn.Open()
    For Each pgStatement As SqlStatement In pgColl
      Console.WriteLine(pgStatement.Text)
      Try
        pgReader = pgStatement.Execute()
        Console.WriteLine("  Records affected " & pgReader.RecordsAffected)
        While pgReader.Read()
          Console.WriteLine(pgReader.GetString(0))
        End While
        pgReader.Close()
        Console.WriteLine()
      Catch ex As Exception
        Console.WriteLine("  Failed")
      End Try
    Next pgStatement
    pgConn.Close()
    Inheritance Hierarchy

    System.Object
       Devart.Common.SqlStatement

    Requirements

    Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also