CONECTOR MYSQL ODBC 3.51 DRIVER DETAILS:
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CONECTOR MYSQL ODBC 3.51 DRIVER
Command Builder - The Command Builder is a support object. The Command Builder works in conjunction with the Data Adapter.
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A DataSet object can be created simply, as shown in the following example code snippet:. Although this creates the DataSet object it has not yet filled it with data.
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For that a Data Adapter is required. The MySqlDataAdapter can be created as illustrated by the following example:. Instantiating a MySqlCommandBuilder object. Once the MySqlDataAdapter has been created, it is necessary to generate the additional statements required for inserting, updating and deleting data. There are several ways to do this, but in this tutorial conector mysql odbc 3.51 will see how this can most easily be done with MySqlCommandBuilder.
The following code snippet ilustrates how conector mysql odbc 3.51 is done:. Note that the MySqlDataAdapter object is passed as a parameter to the command builder. In order to do anything useful with the data from your datbase, you need to load it into a Data Set. The following example code illustrates this:. Note the Fill method is a MySqlDataAdapter method, the Data Adapter knows how to establish a connec tion with the database and retrieve the required data, and then populates the Data Set when the Fill method is called. The data in the Data Set can now be manipulated by the application as required. At some point, changes to data will need to be written back to the database. In this example, data from the World database is read into a Data Grid View control. Here, the data can be viewed and changed before clicking an update button.
The update button then activates code conector mysql odbc 3.51 write changes back to the database. The code uses the principles explained above. The application was built using the Microsoft Visual Studio in order to place and create the user interface controls, but the main code that uses the key classes descibed above is shown below, and is portable. Although it is possible to build SQL query strings directly from user input, this is not advisable as it does not prevent from erroneous or malicious information being conector mysql odbc 3.51.
It is safer to use parameters as they will be processed as field data only. For example, imagine the following query was contructed from user input:. The user could enter a string that generates a run time error, or in the worst case actually harms the system. When using parameters it is not possible to do this because a parameter is only conector mysql odbc 3.51 treated as a field parameter, rather than an arbitrary piece of SQL code.
conector mysql odbc 3.51 Note that the parameter is preceded by an ' ' symbol to indicate it is to be treated as a parameter. As well as marking the position of the parameter in the query string, it is necessary to create a parameter object that can be passed to the Command object.
The conector mysql odbc 3.51 of MySqlParameter is best illustrated by a small code snippet:. In this example the string "North America" is supplied as the parameter value statically, but in a more practical example it would come from a user input control.
Once the parameter has its name and value set it needs to be added to the Command object using the Add method. In this part of the tutorial you have see how to use parameters to make your code more secure. In this conector mysql odbc 3.51 you will see how to work with Stored Procedures. This section assumes you have a basic understanding of what a Stored Procedure is, and how to create one.
Note that The Stored Routine takes a single parameter, which is the continent you wish to restrict your search to. This is illustrated by the following code snippet:.
In this case you also need to pass a parameter to the Stored Procedure. This is shown in the following code snippet:. The value of the parameter con could more realistically have come from a conector mysql odbc 3.51 input control, but for simplicity it is set as a static string in this example. At this point everything is set up and all that now needs to be done is to call the routine.
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This can be achieved using techniques also learned in earlier sections, but in this case the ExecuteReader method of the MySqlCommand object is used. Many web sites feature the facility for the user to create a user account.Connector/ODBC is a standardized conector mysql odbc 3.51 driver for Windows, Linux, Mac OS X, and Unix platforms.
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