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MsgBox CurrentDbQueryDefs("MyQuery")SQL
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You can also write to some of the properties (if they are not read-only) In this way, you can change a query definition:
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CurrentDbQueryDefs("MyQuery")SQL = "select * from MyTable"
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Properties and Methods Explained
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All objects in the object models have properties or methods or both Some have very few; others have many, depending on the complexity of the object A property is a scalar attribute that defines various parameters of an object An example is the Visible property of an open form, which can be True ( 1) or False (0) and dictates whether the form is visible to the user or hidden This is done here using built-in constants for True or False (numeric values are in parentheses)
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14: The Access Object Models
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The Forms object has a Count property that defines how many forms are open in the Access application The properties hold the parameters that define the object Properties are very much dependent on the objects they are part of, and their values can be text or numeric Methods are ways of executing actions based on a particular object They provide a shortcut to doing something on a particular object For example, you may want to delete a field from a table on-the-fly To do this, use the Delete method on the fields collection based on that particular TableDef object Similarly, the TransferSpreadsheet method in the DoCmd object transfers data between your database and a spreadsheet The hard work has been done for you, and all you have to do is call these methods from your code Take your computer, for example It is an object and you can define properties and methods for it A property is a measurable aspect of an object, so for your computer you could have the following properties: Property
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Value
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Note that these are not all numeric It is easy to get the idea that a property is always something directly measurable, such as the height of an object, and is therefore always numeric However, properties may also be text, Boolean (True or False), graphic (in the case of pictures or icons), or enumerated from a specific list relating to that property They can be any data type Methods are words that represent actions that can be performed by the object For your computer, these could be Cold boot Warm boot Shut down Set up Transferring this theory to an Access database and using the CurrentProject object as the example, you have properties such as: Property
Path FullName AccessConnection Name
Description
The path to the Access file The full name with path of the workbook The connection string for this Access database this can be used to make a connection from another Access database (see 19) The file name of the Access database
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Of course, many other properties exist, but this gives you an idea of what some properties look like Examples of object methods on the CurrentDb object include the following: Method
CreateQueryDef CreateTableDef Execute NewPassword
Description
Creates a new query based on tables within the database Creates a new table in the database Executes a SQL statement on the database an extremely useful method Changes the password for the database or sets a new one if there is no previous password
Properties can be either read-only or read/write Read-only means you can access the property s value (setting) but not change it Read/write means you can both access and change a property s value This can have an important effect on your program because you may find your code writing to properties that can only be read To preserve the integrity of the other property s object model, it may be important to keep the property read-only For example, the Count property of any collection of objects is always read-only Altering the Count of TableDefs within a TableDefs collection could lead to very unpredictable results For instance, there might be ten tables within the database If you could change it to five tables, you would lose tables because they would be deleted! Methods are effectively like subroutines or shortcuts to actions that you can call from your code to perform certain actions, such as setting a password on the database or opening a recordset based on a table To try writing the code to set a password would be impossible because you do not know the finer points of the encryption system used for the password and where it is stored in the Access file structure Without VBA, you d need to know the intricacies of C and have the source code to set the password However, Microsoft did all the hard work for us They know the answers to all these questions, so all you need is one line of code calling the NewPassword method With methods, you usually pass parameters as well for example, the NewPassword method has to be given parameters for the old password and the new password Some parameters are optional when calling a method They are indicated as being optional by being shown in square brackets ([ ])
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