Access the database in JSP

Last Update:2018-12-08 Source: Internet

Author: User

Tags informix

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Many new jsp beginners often ask how to connect to the database. Why are there errors? Therefore, I wrote an article here for your reference. In fact, it is not a good practice to put all the database logic in jsp, but it is helpful for beginners to learn. So I did this, when you learn a certain degree, you can consider using the MVC mode for development. When practicing the code, you must put the jdbc driver in the server's class path, and then create a table test in the database. There are two fields: test1, test2, you can use the following SQL statement to create table test (test1 varchar (20), test2 varchar (20), and then write a test record to the table, now let's start our jsp and database journey.

I. jsp connection to Oracle8/8i/9i Database (in thin Mode)
Testoracle. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>
<Html>
<Body>
<% Class. forName ("oracle. jdbc. driver. OracleDriver"). newInstance ();
String url = "jdbc: oracle: thin :@ localhost: 1521: orcl ";
// Orcl is the SID of your database
String user = "scott ";
String password = "tiger ";
Connection conn = DriverManager. getConnection (url, user, password );
Statement stmt = conn. createStatement (ResultSet. TYPE_SCROLL_SENSITIVE, ResultSet. CONCUR_UPDATABLE );
String SQL = "select * from test ";
ResultSet rs1_stmt.exe cuteQuery (SQL );
While (rs. next () {%>
The content of your first field is: <% = rs. getString (1) %>
Your second field content is: <% = rs. getString (2) %>
<% }%>
<% Out. print ("database operation successful, congratulations"); %>
<% Rs. close ();
Stmt. close ();
Conn. close ();
%>
</Body>
</Html>

Ii. jsp connection to SQL Server7.0/2000 database
Testsqlserver. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>
<Html>
<Body>
<% Class. forName ("com. microsoft. jdbc. sqlserver. SQLServerDriver"). newInstance ();
String url = "jdbc: microsoft: sqlserver: // localhost: 1433; DatabaseName = pubs ";
// Pubs for your database
String user = "sa ";
String password = "";
Connection conn = DriverManager. getConnection (url, user, password );
Statement stmt = conn. createStatement (ResultSet. TYPE_SCROLL_SENSITIVE, ResultSet. CONCUR_UPDATABLE );
String SQL = "select * from test ";
ResultSet rs1_stmt.exe cuteQuery (SQL );
While (rs. next () {%>
The content of your first field is: <% = rs. getString (1) %>
Your second field content is: <% = rs. getString (2) %>
<% }%>
<% Out. print ("database operation successful, congratulations"); %>
<% Rs. close ();
Stmt. close ();
Conn. close ();
%>
</Body>
</Html>

Iii. Connecting to the DB2 database using jsp
Testdb2.jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>
<Html>
<Body>
<% Class. forName ("com. ibm. db2.jdbc. app. DB2Driver"). newInstance ();
String url = "jdbc: db2: // localhost: 5000/sample ";
// Sample is your database name
String user = "admin ";
String password = "";
Connection conn = DriverManager. getConnection (url, user, password );
Statement stmt = conn. createStatement (ResultSet. TYPE_SCROLL_SENSITIVE, ResultSet. CONCUR_UPDATABLE );
String SQL = "select * from test ";
ResultSet rs1_stmt.exe cuteQuery (SQL );
While (rs. next () {%>
The content of your first field is: <% = rs. getString (1) %>
Your second field content is: <% = rs. getString (2) %>
<% }%>
<% Out. print ("database operation successful, congratulations"); %>
<% Rs. close ();
Stmt. close ();
Conn. close ();
%>
</Body>
</Html>

4. Connecting to Informix Database Using jsp
Testinformix. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>
<Html>
<Body>
<% Class. forName ("com. informix. jdbc. IfxDriver"). newInstance ();
String url =
"Jdbc: informix-sqli: // 123.45.67.89: 1533/testDB: INFORMIXSERVER = myserver;
User = testuser; password = testpassword ";
// TestDB is your database name
Connection conn = DriverManager. getConnection (url );
Statement stmt = conn. createStatement (ResultSet. TYPE_SCROLL_SENSITIVE, ResultSet. CONCUR_UPDATABLE );
String SQL = "select * from test ";
ResultSet rs1_stmt.exe cuteQuery (SQL );
While (rs. next () {%>
The content of your first field is: <% = rs. getString (1) %>
Your second field content is: <% = rs. getString (2) %>
<% }%>
<% Out. print ("database operation successful, congratulations"); %>
<% Rs. close ();
Stmt. close ();
Conn. close ();
%>
</Body>
</Html>

V. jsp connection to Access database
<% @ Page import = "java. SQL .*"
Import = "java. util .*"
Import = "java. io .*"
Import = "java. text .*"
ContentType = "text/html; charset = gb2312"
Buffer = "20kb"
%> <%! Int all, I, m_count;
String odbcQuery;
Connection odbcconn;
Statement odbcstmt;
ResultSet odbcrs;
String username, title, content, work, email, url, time, date;
String datetime;
%>
<%
Try {
Class. forName ("sun. jdbc. odbc. JdbcOdbcDriver ");
} Catch (ClassNotFoundException e)
{Out. print ("the driver does not exist ");
}
Try {
Odbcconn = DriverManager. getConnection ("jdbc: odbc: db1 ");
Odbcstmt = odbcconn. createStatement ();
OdbcQuery = "Select * From book where datetime> 2001-4-26 Order By datetime DESC ";
Odbcrs=odbcstmt.exe cuteQuery (odbcQuery );
Int I = 0;
While (I <130) odbcrs. next ();
While (odbcrs. next ())
{
// * // Display the database content for debugging //
Int ii;
Try {
Try {
For (ii = 1; ii ++)
Out. print ("<br> Cloumn" + ii + "is:" + odbcrs. getString (ii ));
} Catch (NullPointerException e ){
Out. print ("Empty Pointer ");
}
} Catch (SQLException e ){
}
}
Odbcrs. close ();
Odbcstmt. close ();
Odbcconn. close ();
} Catch (SQLException e)
{Out. print (e );
}
%>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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