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The GetReader() function creates and opens a database connection and retrieves the DataReader so that individual columns can be extracted from it The ExecuteCommand() function is used to execute a SQL command on the database Typically this will be used for non-query commands (INSERTS, DELETES and UPDATES), although the function can also execute a SQL Select command and return a result Two different ways are used to execute the command, depending on whether it includes the word Select or not If there is no Select part to a command, the ExecuteNonQuery() method is used since this will return a count of the number of rows in the database affected by the query If there is a Select part to the command, it should be sent by the ExecuteScalar() method, which

The invocation of println uses a quali ed name ( 66) Testx, which uses the class type name Test to access the class variable x, because the declaration of Testx is shadowed at this point and cannot be referred to by its simple name The following example illustrates the shadowing of one type declaration by another:

import javautil*; class Vector { int val[] = { 1 , 2 };

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can return a single item of data This is useful if we are executing an INSERT command where there is an identity eld in the database, since an added Select statement (shown later) can return this The result (if the SQL string is properly constructed) is an update to the database and a single Object result, which must be cast to a type that matches the type of data you expect to be returned GetReader() and ExecuteCommand() are as shown in Listing 1219

class Test { public static void main(String[] args) { Vector v = new Vector(); Systemoutprintln(vval[0]); } }

Private Private Private Private CONNSTR = "<usual connection string stuff>" dbConn As SqlClientSqlConnection dbCmd As SqlClientSqlCommand dbRdr As SqlClientSqlDataReader

compiles and prints: using the class Vector declared here in preference to the generic ( 812) class javautilVector that might be imported on demand

oUserSetPassword "pa55w0rd!" oUserFullName = "Don Jones" oUserDescription = "Author" oUserHomeDirectory = "\\server1\donj" oUserRasPermissions = 9 oUserSetInfo

Function GetReader(ByVal SQL As String) _ As SqlClientSqlDataReader Dim rd As SqlClientSqlDataReader dbConn = New SqlClientSqlConnection(CONNSTR) dbCmd = New SqlClientSqlCommand(SQL, dbConn) dbConnOpen() rd = dbCmdExecuteReader( _ CommandBehaviorCloseConnection) Return rd End Function Function ExecuteCommand(ByVal SQL As String) As Object Dim result As Integer dbConn = New SqlClientSqlConnection(CONNSTR) dbCmd = New SqlClientSqlCommand(SQL, dbConn) dbConnOpen() If InStr(SQL, "Select", CompareMethodText) > 0 Then result = CType(dbCmdExecuteScalar(), Integer) Else result = dbCmdExecuteNonQuery() End If dbConnClose() Return result End Function Listing 1219: Functions for fetching and storing data

The expression x in the invocation of print refers to (denotes) the value of the local variable x

The Book class has two constructors The rst takes an ISBN string and uses it to retrieve the corresponding book s record I ve omitted any error-handling code for clarity but there should certainly be some, at the very least to indicate where a supplied ISBN string is not in the database Code in this constructor would be very simple but for the need to retrieve a possible list of Author identi cations from the [Title Author] table Note the use of the AddAuthor() method to append the author ids to an ArrayList of authors The second constructor is simpler, since it just takes the supplied parameter data and assigns it to the various member variables Note that author ids are not included in this list since we would never know how many to deal with (I ve seen some computing books with more than a dozen authors names on the jacket) Each author is added individually using the AddAuthor() method

Since the scope of a class variable includes the entire body of the class ( 82) the class variable x would normally be available throughout the entire body of the method main In this example, however, the class variable x is shadowed within the body of the method main by the declaration of the local variable x A local variable has as its scope the rest of the block in which it is declared ( 1442); in this case this is the rest of the body of the main method, namely its initializer 0 and the invocations of print and println This means that:

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