Jsp connection database Daquan _ MySQL

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. In practice, many new jsp beginners often ask how to connect to the database and how to make mistakes? 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. *" %>


<% 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 ();
%>


II. jsp connection to SQL Server7.0/2000 Database
Testsqlserver. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>


<% 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 ();
%>


III. connecting to the DB2 database using jsp
Testdb2.jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>


<% 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 ();
%>


4. connecting to Informix database using jsp
Testinformix. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>


<% 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 ();
%>


V. jsp connection to Sybase database
Testmysql. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>


<% 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 ();
%>


VI. jsp connection to MySQL database
Testmysql. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>


<% Class. forName ("org. gjt. mm. mysql. Driver"). newInstance ();
String url = "jdbc: mysql: // localhost/softforum? User = soft & password = soft1234 & useUnicode = true & characterEncoding = 8859_1"
// 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 ();
%>


VII. jsp connection to PostgreSQL database
Testmysql. jsp is as follows:
<% @ Page contentType = "text/html; charset = gb2312" %>
<% @ Page import = "java. SQL. *" %>


<% Class. forName ("org. postgresql. Driver"). newInstance ();
String url = "jdbc: postgresql: // localhost/soft"
// Soft is your database name
String user = "myuser ";
String password = "mypassword ";
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 ();
%>