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PgSqlCommand Class
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Devart.Data.PostgreSql Namespace : PgSqlCommand Class

Represents a SQL statement or stored procedure to execute against PostgreSQL.

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Data.Common.DbCommand
            Devart.Common.DbCommandBase
               Devart.Data.PostgreSql.PgSqlCommand

Syntax

Visual Basic (Declaration) 
Public Class PgSqlCommand 
   Inherits Devart.Common.DbCommandBase
   Implements IComponent, IDbCommand, ICloneable, IDisposable 
C# 
public class PgSqlCommand : Devart.Common.DbCommandBase, IComponent, IDbCommand, ICloneable, IDisposable 

Remarks

The PgSqlCommand class provides the following methods for executing commands against the PostgreSQL database:
Item Description
ExecuteReader Executes commands that return rows.
ExecutePageReader Returns a specific subset of rows when paging through the results of a query.
ExecuteNonQuery Executes SQL commands such as INSERT, DELETE, UPDATE.
ExecuteScalar Retrieves a single value (for example, an aggregate value) from a data source.

If execution of the command results in a fatal PgSqlException, the PgSqlConnection may close. However, the user can reopen the connection and continue.

This class supports cross-form data binding with the InterForm Technology.

Example

The following example uses the ExecuteReader method of PgSqlCommand, along with PgSqlDataReader and PgSqlConnection, to select rows from a table.
C#csharpCopy Code
public void ReadMyData(string myConnString)
{
  string mySelectQuery = "SELECT DeptNo, DName FROM Test.Dept";
  PgSqlConnection pgConnection = new PgSqlConnection(myConnString);
  PgSqlCommand pgCommand = new PgSqlCommand(mySelectQuery,pgConnection);
  pgConnection.Open();
  PgSqlDataReader pgReader = pgCommand.ExecuteReader();
  try
  {
    while (pgReader.Read())
    {
      Console.WriteLine(pgReader.GetInt32(0).ToString() + ", " + pgReader.GetString(1));
    }
  }
  finally
  {
  // always call Close when done reading.
  pgReader.Close();
  // always call Close when done reading.
  pgConnection.Close();
  }
}
C#Visual BasicCopy Code
Public Sub ReadMyData(myConnString As String)
  Dim mySelectQuery As String = "SELECT DeptNo, DName FROM Test.Dept"
  Dim pgConnection As New PgSqlConnection(myConnString)
  Dim pgCommand As New PgSqlCommand(mySelectQuery, pgConnection)
  pgConnection.Open()
  Dim pgReader As PgSqlDataReader = pgCommand.ExecuteReader()
  Try
    While pgReader.Read()
      Console.WriteLine(pgReader.GetInt32(0).ToString() + ", " _
        + pgReader.GetString(1))
    End While
  Finally
      ' always call Close when done reading.
      pgReader.Close()
      ' always call Close when done with connection.
      pgConnection.Close()
  End Try
End Sub

Requirements

Namespace: Devart.Data.PostgreSql

Platforms:Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family, Windows 7, Windows 8, Windows 10, Windows Server 2012 family.

See Also