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 to create
Create table test (test1 varchar (20), test2 varchar (20)
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 Sybase database
Testmysql. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>
<Html>
<Body>
<% Class. forName ("com. sybase. jdbc. SybDriver"). newInstance ();
String url = "jdbc: sybase: ttl: localhost: 5007/tsdata ";
// Tsdata is your database name
Properties sysProps = System. getProperties ();
SysProps. put ("user", "userid ");
SysProps. put ("password", "user_password ");
Connection conn = DriverManager. getConnection (url, SysProps );
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>
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