MySqlConnection Class

In This Topic

Represents an open connection to MySQL.

Syntax

Visual Basic
C#

'Declaration
 
Public Class MySqlConnection 
   Inherits Devart.Common.DbConnectionBase
   Implements System.ComponentModel.IComponent, System.Data.IDbConnection, System.ICloneable, System.IDisposable

public class MySqlConnection : Devart.Common.DbConnectionBase, System.ComponentModel.IComponent, System.Data.IDbConnection, System.ICloneable, System.IDisposable

Remarks

A MySqlConnection object represents a unique connection to MySQL. Use it in conjunction with MySqlCommand, MySqlDataReader, MySqlDataAdapter or other components for convenient interoperation with MySQL.

When you create an instance of MySqlConnection, all properties are set to their initial values. For a list of these values, see ConnectionString.

If the MySqlConnection goes out of scope, it is not closed. Therefore, you must explicitly close the connection by calling Close.

Note that MySqlConnection instance is not guaranteed to be thread safe. You should avoid using the same MySqlConnection in several threads at the same time. It is recommended to open a new connection per thread and to close it when the work is done. Actually, connections will not be created/disposed every time with the Pooling=true; connection string option - connections will be stored at connection pool. This boosts performance greatly.

A single MySqlConnection can be used by many MySqlCommand objects on the assumption that all operations will be done consecutively. In other words, you can not execute a SQL statement while an asynchronous operation is in progress.

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

Example

The following example creates a MySqlCommand and a MySqlConnection. The MySqlConnection is opened and set as the Connection property. The example then calls ExecuteNonQuery method, and closes the connection. To accomplish this, the ExecuteNonQuery is passed a connection string and a query string that is SQL INSERT statement.

csharp

public void InsertRow(string myConnectionString)
{
  // If the connection string is empty, use default.
  if(myConnectionString == "")
  {
    myConnectionString = 
        "User Id=root;Host=localhost;Database=Test;";
  }
  MySqlConnection myConn = new MySqlConnection(myConnectionString);
  string myInsertQuery = "INSERT INTO DEPT VALUES (50,'Development','Philadelphia')";
  MySqlCommand myCommand = new MySqlCommand(myInsertQuery);
  myCommand.Connection = myConn;
  myConn.Open();
  try
  {
    myCommand.ExecuteNonQuery();
  }
  finally
  {
    myConn.Close();
  }
}

Visual Basic

Public Sub InsertRow(myConnectionString As String)
  ' If the connection string is empty, use default.
  If myConnectionString = "" Then
    myConnectionString = _
        "User Id=root;Host=localhost;Database=Test;"
  End If
  Dim myConn As New MySqlConnection(myConnectionString)
  Dim myInsertQuery As String = "INSERT INTO DEPT VALUES (50,'Development','Philadelphia')"
  Dim myCommand As New MySqlCommand(myInsertQuery)
  myCommand.Connection = myConn
  myConn.Open()
  Try
    myCommand.ExecuteNonQuery()
  Finally
    myConn.Close()
  End Try
End Sub

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Data.Common.DbConnection
            Devart.Common.DbConnectionBase
               Devart.Data.MySql.MySqlConnection

Reference

MySqlConnection Members
Devart.Data.MySql Namespace
MySqlDataAdapter Class
MySqlCommand Class

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