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JAVA/JSP Learning Series 5 (JDBC-ODBC flip example)

Source: Internet
Author: User
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I. Preparations before running

We recommend that you create a DNS for the MS SQLServer7 database named Test_DB.

There is a table in the database: guestbook field: name (varchar), email (varchar), body (text)

The sa password is blank for database users and can be modified by themselves.

Ii. Code

<% @ Page contentType = "text/html; charset = gb2312" %>

<%

// Variable Declaration

Java. SQL. Connection sqlCon; // database Connection object

Java. SQL. Statement sqlStmt; // SQL Statement object

Java. SQL. ResultSet sqlRst; // result set object

Java. lang. String strCon; // database connection String

Java. lang. String strSQL; // SQL statement

Int intPageSize; // number of records displayed on one page

Int intRowCount; // The total number of records.

Int intPageCount; // the total number of pages.

Int intPage; // the page number to be displayed.

Java. lang. String strPage;

Int I, j, k; // set the number of records displayed on one page

IntPageSize = 5; // get the page number to be displayed

StrPage = request. getParameter ("page ");

If (strPage = null ){

// Indicates that the QueryString parameter does not contain the page parameter. The first page of data is displayed.

IntPage = 1;

} Else {

// Converts a string to an integer.

IntPage = java. lang. Integer. parseInt (strPage );

If (intPage <1) intPage = 1 ;}

// Load the JDBC-ODBC driver

Class. forName ("sun. jdbc. odbc. JdbcOdbcDriver ");

// Set the database connection string

StrCon = "jdbc: odbc: Test_DB ";

// Connect to the database

SqlCon = java. SQL. DriverManager. getConnection (strCon, "sa ","");

// Create an SQL statement object

SqlStmt = sqlCon. createStatement ();

// Obtain the total number of records

StrSQL = "select count (*) from guestbook ";

SqlRst = sqlStmt.exe cuteQuery (strSQL );

// Execute the SQL statement and obtain the result set

SqlRst. next (); // when the record set is opened, the pointer is located before the first record.

IntRowCount = sqlRst. getInt (1 );

SqlRst. close (); // close the result set.

// Calculate the total number of pages

IntPageCount = (intRowCount + intPageSize-1)/intPageSize;

// Adjust the page number to be displayed if (intPage> intPageCount) intPage = intPageCount;

// Set the SQL statement for getting data

StrSQL = "select name, email, body from guestbook ";

// Execute the SQL statement and obtain the result set

SqlRst = sqlStmt.exe cuteQuery (strSQL );

// Locate the record pointer to the first record on the page to be displayed.

I = (intPage-1) * intPageSize;

For (j = 0; j <I; j ++) sqlRst. next (); %>

<Html>

<Head>

<Title> JSP database operation routine-data paging display-JDBC-ODBC </title>

</Head>

<Body>

<P align = center> jdbc-odbc message board </p>

<Table border = "1" cellspacing = "0" cellpadding = "0" width = 600 align = center>

<%

// Display data

I = 0;

While (I <intPageSize & sqlRst. next () {%>

<Tr>

<Td> name: <% = sqlRst. getString (1) %> </td>

<Td> Email: <% = sqlRst. getString (2) %> </td>

</Tr>

<Tr>

<Td colspan = 2> <% = sqlRst. getString (3) %> </td>

</Tr>

<% I ++ ;}%>

<Tr>

<Td colspan = 2 align = center>

Page <% = intPage %> total page <% = intPageCount %>

<% If (intPage <intPageCount) {%>

<A href = "mssql. jsp? Page = <% = intPage + 1%> "> next page </a> <%

}

%>

<% If (intPage> 1) {%>

<A href = "mssql. jsp? Page = <% = intPage-1 %> "> previous page </a> <%

}

%>

</Td>

</Tr>

</Table> </body>

</Html>

<%

// Close the result set

SqlRst. close ();

// Close the SQL statement object

SqlStmt. close ();

// Close the database

SqlCon. close ();

%>

3. How to run it?

Save the code as a file test. jsp

Under Orion Application Server:

Copy to the default-web-app directory of orion, and run the following command:

Http: // localhost: port/test. jsp

Access Test

You can run Resin, Tomcat, JWS, and so on.

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