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|
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<docs> |
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<ClassSummary> |
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<summary>Represents a SQL statement to execute against a MySQL database. This class cannot be inherited.</summary> |
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<remarks> |
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<B>MySqlCommand</B> features the following methods for executing commands at a MySQL database: |
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<list type="table"> |
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<listheader> |
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<term>Item</term> |
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<term>Description</term> |
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</listheader> |
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<item> |
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<term> |
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<a href="MySql.Data.MySqlClient.MySqlCommand.ExecuteReader_overloads.html">ExecuteReader</a> |
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</term> |
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<description>Executes commands that return rows.</description> |
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</item> |
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<item> |
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<term> |
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<a href="MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery.html">ExecuteNonQuery</a> |
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</term> |
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<description>Executes commands such as SQL INSERT, DELETE, and UPDATE statements.</description> |
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</item> |
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<item> |
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<term> |
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<a href="MySql.Data.MySqlClient.MySqlCommand.ExecuteScalar.html">ExecuteScalar</a> |
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</term> |
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<description>Retrieves a single value (for example, an aggregate value) from a database.</description> |
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</item> |
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</list> |
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|
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You can reset the <B>CommandText</B> property and reuse the <B>MySqlCommand</B> |
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object. However, you must close the <A |
||||
href="MySql.Data.MySqlClient.MySqlDataReader.html">MySqlDataReader</A> |
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before you can execute a new or previous command. |
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|
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If a <A href="MySql.Data.MySqlClient.MySqlException.html">MySqlException</A> is |
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generated by the method executing a <B>MySqlCommand</B>, the <A |
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href="MySql.Data.MySqlClient.MySqlConnection.html">MySqlConnection</A> |
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remains open. It is the responsibility of the programmer to close the connection. |
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|
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<note> |
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Using the '@' symbol for paramters is now the preferred approach although the old pattern of using |
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'?' is still supported. Please be aware though that using '@' can cause conflicts when user variables |
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are also used. To help with this situation please see the documentation on the 'allow user variables' |
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connection string option. The 'old syntax' connection string option has now been deprecated. |
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</note> |
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</remarks> |
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|
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<example> |
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The following example creates a <A href="frlrfsystemdatasqlclientsqlcommandclasstopic.htm">MySqlCommand</A> and |
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a <B>MySqlConnection</B>. The <B>MySqlConnection</B> is opened and set as the <A |
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href="frlrfsystemdatasqlclientsqlcommandclassconnectiontopic.htm">Connection</A> |
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for the <B>MySqlCommand</B>. The example then calls <A |
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href="frlrfsystemdatasqlclientsqlcommandclassexecutenonquerytopic.htm">ExecuteNonQuery</A>, |
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and closes the connection. To accomplish this, the <B>ExecuteNonQuery</B> is |
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passed a connection string and a query string that is a SQL INSERT |
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statement. |
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<code lang="vbnet"> |
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Public Sub InsertRow(myConnectionString As String) |
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" If the connection string is null, use a default. |
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If myConnectionString = "" Then |
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myConnectionString = "Database=Test;Data Source=localhost;User Id=username;Password=pass" |
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End If |
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Dim myConnection As New MySqlConnection(myConnectionString) |
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Dim myInsertQuery As String = "INSERT INTO Orders (id, customerId, amount) Values(1001, 23, 30.66)" |
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Dim myCommand As New MySqlCommand(myInsertQuery) |
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myCommand.Connection = myConnection |
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myConnection.Open() |
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myCommand.ExecuteNonQuery() |
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myCommand.Connection.Close() |
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End Sub |
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</code> |
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<code lang="C#"> |
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public void InsertRow(string myConnectionString) |
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{ |
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// If the connection string is null, use a default. |
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if(myConnectionString == "") |
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{ |
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myConnectionString = "Database=Test;Data Source=localhost;User Id=username;Password=pass"; |
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} |
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MySqlConnection myConnection = new MySqlConnection(myConnectionString); |
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string myInsertQuery = "INSERT INTO Orders (id, customerId, amount) Values(1001, 23, 30.66)"; |
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MySqlCommand myCommand = new MySqlCommand(myInsertQuery); |
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myCommand.Connection = myConnection; |
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myConnection.Open(); |
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myCommand.ExecuteNonQuery(); |
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myCommand.Connection.Close(); |
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} |
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</code> |
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</example> |
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</ClassSummary> |
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|
||||
|
||||
|
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<ctor1> |
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<overloads> |
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<summary> |
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Initializes a new instance of the MySqlCommand class. |
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</summary> |
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<example> |
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The following example creates a MySqlCommand and sets some of its properties. |
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<para></para> |
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<note> |
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This example shows how to use one of the overloaded |
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versions of the MySqlCommand constructor. For other examples that might be available, |
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see the individual overload topics. |
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</note> |
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|
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<code lang="vbnet"> |
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Public Sub CreateMySqlCommand() |
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Dim myConnection As New MySqlConnection _ |
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("Persist Security Info=False;database=test;server=myServer") |
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myConnection.Open() |
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Dim myTrans As MySqlTransaction = myConnection.BeginTransaction() |
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Dim mySelectQuery As String = "SELECT * FROM MyTable" |
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Dim myCommand As New MySqlCommand(mySelectQuery, myConnection, myTrans) |
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myCommand.CommandTimeout = 20 |
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End Sub |
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</code> |
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<code lang="C#"> |
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public void CreateMySqlCommand() |
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{ |
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MySqlConnection myConnection = new MySqlConnection("Persist Security Info=False; |
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database=test;server=myServer"); |
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myConnection.Open(); |
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MySqlTransaction myTrans = myConnection.BeginTransaction(); |
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string mySelectQuery = "SELECT * FROM myTable"; |
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MySqlCommand myCommand = new MySqlCommand(mySelectQuery, myConnection,myTrans); |
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myCommand.CommandTimeout = 20; |
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} |
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</code> |
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<code lang="C++"> |
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public: |
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void CreateMySqlCommand() |
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{ |
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MySqlConnection* myConnection = new MySqlConnection(S"Persist Security Info=False; |
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database=test;server=myServer"); |
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myConnection->Open(); |
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MySqlTransaction* myTrans = myConnection->BeginTransaction(); |
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String* mySelectQuery = S"SELECT * FROM myTable"; |
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MySqlCommand* myCommand = new MySqlCommand(mySelectQuery, myConnection, myTrans); |
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myCommand->CommandTimeout = 20; |
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}; |
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</code> |
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</example> |
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</overloads> |
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|
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|
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<summary> |
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Initializes a new instance of the MySqlCommand class. |
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</summary> |
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<remarks> |
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The base constructor initializes all fields to their default values. The |
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following table shows initial property values for an instance of <see cref="MySqlCommand"/>. |
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<list type="table"> |
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<listheader> |
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<term>Properties</term> |
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<term>Initial Value</term> |
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</listheader> |
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<item> |
||||
<term> |
||||
<see cref="CommandText"/> |
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</term> |
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<term>empty string ("")</term> |
||||
</item> |
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<item> |
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<term> |
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<see cref="CommandTimeout"/> |
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</term> |
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<term>0</term> |
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</item> |
||||
<item> |
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<term> |
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<see cref="CommandType"/> |
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</term> |
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<term>CommandType.Text</term> |
||||
</item> |
||||
<item> |
||||
<term> |
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<see cref="Connection"/> |
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</term> |
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<term>Null</term> |
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</item> |
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</list> |
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<para> |
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You can change the value for any of these properties through a separate call to |
||||
the property. |
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</para> |
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</remarks> |
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<example> |
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The following example creates a <see cref="MySqlCommand"/> and |
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sets some of its properties. |
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|
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<code lang="vbnet"> |
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Public Sub CreateMySqlCommand() |
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Dim myCommand As New MySqlCommand() |
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myCommand.CommandType = CommandType.Text |
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End Sub |
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</code> |
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<code lang="C#"> |
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public void CreateMySqlCommand() |
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{ |
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MySqlCommand myCommand = new MySqlCommand(); |
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myCommand.CommandType = CommandType.Text; |
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} |
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</code> |
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</example> |
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</ctor1> |
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|
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<ctor2> |
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<summary> |
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Initializes a new instance of the <see cref="MySqlCommand"/> class with the text of the query. |
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</summary> |
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<param name="cmdText">The text of the query.</param> |
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<remarks> |
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When an instance of <see cref="MySqlCommand"/> is created, |
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the following read/write properties are set to initial values. |
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|
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<list type="table"> |
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<listheader> |
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<term>Properties</term> |
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<term>Initial Value</term> |
||||
</listheader> |
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<item> |
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<term> |
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<see cref="CommandText"/> |
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</term> |
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<term> |
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<i>cmdText</i> |
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</term> |
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</item> |
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<item> |
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<term> |
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<see cref="CommandTimeout"/> |
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</term> |
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<term>0</term> |
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</item> |
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<item> |
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<term> |
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<see cref="CommandType"/> |
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</term> |
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<term>CommandType.Text</term> |
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</item> |
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<item> |
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<term> |
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<see cref="Connection"/> |
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</term> |
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<term>Null</term> |
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</item> |
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</list> |
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<para> |
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You can change the value for any of these properties through a separate call to |
||||
the property. |
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</para> |
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</remarks> |
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<example> |
||||
The following example creates a <see cref="MySqlCommand"/> and |
||||
sets some of its properties. |
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|
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<code lang="vbnet"> |
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Public Sub CreateMySqlCommand() |
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Dim sql as String = "SELECT * FROM mytable" |
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Dim myCommand As New MySqlCommand(sql) |
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myCommand.CommandType = CommandType.Text |
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End Sub |
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</code> |
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<code lang="C#"> |
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public void CreateMySqlCommand() |
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{ |
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string sql = "SELECT * FROM mytable"; |
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MySqlCommand myCommand = new MySqlCommand(sql); |
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myCommand.CommandType = CommandType.Text; |
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} |
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</code> |
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</example> |
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</ctor2> |
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|
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<ctor3> |
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<summary> |
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Initializes a new instance of the <see cref="MySqlCommand"/> class |
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with the text of the query and a <see cref="MySqlConnection"/>. |
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</summary> |
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<param name="cmdText">The text of the query.</param> |
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<param name="connection"> |
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A <see cref="MySqlConnection"/> that represents the |
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connection to an instance of SQL Server. |
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</param> |
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<remarks> |
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When an instance of <see cref="MySqlCommand"/> is created, |
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the following read/write properties are set to initial values. |
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|
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<list type="table"> |
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<listheader> |
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<term>Properties</term> |
||||
<term>Initial Value</term> |
||||
</listheader> |
||||
<item> |
||||
<term> |
||||
<see cref="CommandText"/> |
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</term> |
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<term> |
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<i>cmdText</i> |
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</term> |
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</item> |
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<item> |
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<term> |
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<see cref="CommandTimeout"/> |
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</term> |
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<term>0</term> |
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</item> |
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<item> |
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<term> |
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<see cref="CommandType"/> |
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</term> |
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<term>CommandType.Text</term> |
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</item> |
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<item> |
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<term> |
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<see cref="Connection"/> |
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</term> |
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<term> |
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<i>connection</i> |
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</term> |
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</item> |
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</list> |
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<para> |
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You can change the value for any of these properties through a separate call to |
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the property. |
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</para> |
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</remarks> |
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<example> |
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The following example creates a <see cref="MySqlCommand"/> and |
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sets some of its properties. |
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|
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<code lang="vbnet"> |
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Public Sub CreateMySqlCommand() |
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Dim conn as new MySqlConnection("server=myServer") |
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Dim sql as String = "SELECT * FROM mytable" |
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Dim myCommand As New MySqlCommand(sql, conn) |
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myCommand.CommandType = CommandType.Text |
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End Sub |
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</code> |
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<code lang="C#"> |
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public void CreateMySqlCommand() |
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{ |
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MySqlConnection conn = new MySqlConnection("server=myserver") |
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string sql = "SELECT * FROM mytable"; |
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MySqlCommand myCommand = new MySqlCommand(sql, conn); |
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myCommand.CommandType = CommandType.Text; |
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} |
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</code> |
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</example> |
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|
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|
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</ctor3> |
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|
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<ctor4> |
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<summary> |
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Initializes a new instance of the <see cref="MySqlCommand"/> class |
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with the text of the query, a <see cref="MySqlConnection"/>, and the |
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<see cref="MySqlTransaction"/>. |
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</summary> |
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|
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<param name="cmdText">The text of the query.</param> |
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<param name="connection"> |
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A <see cref="MySqlConnection"/> that represents the |
||||
connection to an instance of SQL Server. |
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</param> |
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<param name="transaction"> |
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The <see cref="MySqlTransaction"/> in which the <see cref="MySqlCommand"/> executes. |
||||
</param> |
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<remarks> |
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When an instance of <see cref="MySqlCommand"/> is created, |
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the following read/write properties are set to initial values. |
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|
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<list type="table"> |
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<listheader> |
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<term>Properties</term> |
||||
<term>Initial Value</term> |
||||
</listheader> |
||||
<item> |
||||
<term> |
||||
<see cref="CommandText"/> |
||||
</term> |
||||
<term> |
||||
<i>cmdText</i> |
||||
</term> |
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</item> |
||||
<item> |
||||
<term> |
||||
<see cref="CommandTimeout"/> |
||||
</term> |
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<term>0</term> |
||||
</item> |
||||
<item> |
||||
<term> |
||||
<see cref="CommandType"/> |
||||
</term> |
||||
<term>CommandType.Text</term> |
||||
</item> |
||||
<item> |
||||
<term> |
||||
<see cref="Connection"/> |
||||
</term> |
||||
<term> |
||||
<i>connection</i> |
||||
</term> |
||||
</item> |
||||
</list> |
||||
<para> |
||||
You can change the value for any of these properties through a separate call to |
||||
the property. |
||||
</para> |
||||
</remarks> |
||||
<example> |
||||
The following example creates a <see cref="MySqlCommand"/> and |
||||
sets some of its properties. |
||||
|
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<code lang="vbnet"> |
||||
Public Sub CreateMySqlCommand() |
||||
Dim conn as new MySqlConnection("server=myServer") |
||||
conn.Open(); |
||||
Dim txn as MySqlTransaction = conn.BeginTransaction() |
||||
Dim sql as String = "SELECT * FROM mytable" |
||||
Dim myCommand As New MySqlCommand(sql, conn, txn) |
||||
myCommand.CommandType = CommandType.Text |
||||
End Sub |
||||
</code> |
||||
<code lang="C#"> |
||||
public void CreateMySqlCommand() |
||||
{ |
||||
MySqlConnection conn = new MySqlConnection("server=myserver") |
||||
conn.Open(); |
||||
MySqlTransaction txn = conn.BeginTransaction(); |
||||
string sql = "SELECT * FROM mytable"; |
||||
MySqlCommand myCommand = new MySqlCommand(sql, conn, txn); |
||||
myCommand.CommandType = CommandType.Text; |
||||
} |
||||
</code> |
||||
</example> |
||||
|
||||
</ctor4> |
||||
|
||||
|
||||
|
||||
|
||||
<ExecuteNonQuery> |
||||
<summary> |
||||
Executes a SQL statement against the connection and returns the number of rows affected. |
||||
</summary> |
||||
<returns>Number of rows affected</returns> |
||||
<remarks> |
||||
You can use ExecuteNonQuery to perform any type of database operation, |
||||
however any resultsets returned will not be available. Any output parameters |
||||
used in calling a stored procedure will be populated with data and can be |
||||
retrieved after execution is complete. |
||||
For UPDATE, INSERT, and DELETE statements, the return value is the number |
||||
of rows affected by the command. For all other types of statements, the return |
||||
value is -1. |
||||
</remarks> |
||||
<example> |
||||
The following example creates a MySqlCommand and then |
||||
executes it using ExecuteNonQuery. The example is passed a string that is a |
||||
SQL statement (such as UPDATE, INSERT, or DELETE) and a string to use to |
||||
connect to the data source. |
||||
<code lang="vbnet"> |
||||
Public Sub CreateMySqlCommand(myExecuteQuery As String, myConnection As MySqlConnection) |
||||
Dim myCommand As New MySqlCommand(myExecuteQuery, myConnection) |
||||
myCommand.Connection.Open() |
||||
myCommand.ExecuteNonQuery() |
||||
myConnection.Close() |
||||
End Sub |
||||
</code> |
||||
<code lang="C#"> |
||||
public void CreateMySqlCommand(string myExecuteQuery, MySqlConnection myConnection) |
||||
{ |
||||
MySqlCommand myCommand = new MySqlCommand(myExecuteQuery, myConnection); |
||||
myCommand.Connection.Open(); |
||||
myCommand.ExecuteNonQuery(); |
||||
myConnection.Close(); |
||||
} |
||||
</code> |
||||
</example> |
||||
</ExecuteNonQuery> |
||||
|
||||
<ExecuteReader1> |
||||
<summary> |
||||
Sends the <see cref="CommandText"/> to the <see cref="MySqlConnection">Connection</see>, |
||||
and builds a <see cref="MySqlDataReader"/> using one of the <see cref="CommandBehavior"/> values. |
||||
</summary> |
||||
<param name="behavior"> |
||||
One of the <see cref="CommandBehavior"/> values. |
||||
</param> |
||||