Execute Method (SqlStatement)

In This Topic

Executes the statement and returns result set.

Syntax

Visual Basic
C#

'Declaration
 
Public Function Execute() As IDataReader

public IDataReader Execute()

Return Value

Result set returned by the statement execution.

Remarks

This method is an alternative to Execute and ExecuteNext methods. It allows you to execute statements individually in any order. Note that Execute of SqlStatement does not generate Error or Progress event.

Example

This sample shows how to retrieve collection of statements that make up the script and execute them one by one.

csharp

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();

Visual Basic

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()

Reference

SqlStatement Class
SqlStatement Members
Text Property

Send Feedback