通用数据库操作BEAN
类别: JSP教程 
package pkgCDB;
import java.text.*;
import java.util.*;
import java.sql.*;
public class clsCDB
{
String sDBDriver = "";
String sConnStr = "";
String sHint = "";
ResultSet rs = null;
Connection conn = null;
Statement stmt = null;
public String getHint()
{
return sHint;
}
public void setDBDriver(String s)
{
sDBDriver = "" + s;
}
public String getDBDriver()
{
return sDBDriver;
}
public String getConnStr()
{
return sConnStr;
}
public void setConnStr(String s)
{
sConnStr = "" + s;
}
public ResultSet getResultSet()
{
return rs;
}
//Initialize the database
public boolean Initialization(String dbDrive,String dbConn)
{
sDBDriver = dbDrive;
sConnStr = dbConn;
return Initialization();
}
public boolean Initialization()
{
try
{
Class.forName(sDBDriver);
sHint = "Initialization sucessfully";
return true;
}
catch(java.lang.ClassNotFoundException e) {
sHint = "Initialization : " + e.getMessage();
return false;
}
}
//A common function perhaps usable
public String chkStr(String inStr)
{
StringBuffer result = new StringBuffer("");
char cc;
if (inStr != null)
{
for (int i = 0; i < inStr.length(); i++)
{
cc = inStr.charAt(i);
if (cc == ´´´)
{
result.append(´´´);
}
result.append(cc);
}
}
return result.toString();
}
//execute a SQL statement with recordset returned
public ResultSet executeQuery(String sql)
{
rs = null;
try
{
conn = DriverManager.getConnection(sConnStr);
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
}
catch(SQLException ex)
{
sHint = "executeQuery: " + ex.getMessage();
}
return rs;
}
//execute a SQL statement without returning recordset
public boolean executeUpdate(String sql)
{
try
{
conn = DriverManager.getConnection(sConnStr);
stmt = conn.createStatement();
stmt.executeUpdate(sql);
return true;
}
catch(SQLException ex)
{
sHint = "executeUpdate: " + ex.getMessage();
return false;
}
}
//Close connections
public boolean closeConn()
{
try
{
if (rs!=null)
rs.close();
if (stmt!=null)
stmt.close();
if (conn!=null)
conn.close();
return true;
}
catch(SQLException ex)
{
sHint = "closeConn: " + ex.getMessage();
return false;
}
}
}
测试用JSP文件
<%@ page language="java" import="java.sql.*" %>
<%@ page import = "pkgCDB.clsCDB"%>
<jsp:useBean id="CommonDBBean" class="pkgCDB.clsCDB" scope="session"/>
<html>
<head><title>Common Database Bean Test</title></head>
<body>
<font size=4>
<%
if ( (request.getParameter("DBDriver") == null)
// (request.getParameter("ConnStr") == null)
// (request.getParameter("SQLStr") == null) )
{ %>
<form method=get>
Input DBDriver: <input type=text name=DBDriver value="sun.jdbc.odbc.JdbcOdbcDriver">
<BR>
Input Connection String: <input type=text name=ConnStr value="jdbc:odbc:testBean">
Input SQL Query: <input type=text name=SQLStr value="select * from jobs">
<BR>
<input type=submit value="Submit">
</form>
<% }
else
{ %>
<% if (!CommonDBBean.Initialization(request.getParameter("DBDriver"),request.getParameter("ConnStr")))
{ %>
<%=CommonDBBean.getHint() + "<p></p>" %>
<% }
else
{ %>
<% ResultSet rs; %>
<% rs = CommonDBBean.executeQuery(request.getParameter("SQLStr")); %>
<%int j = rs.getMetaData().getColumnCount(); %>
<table BORDER = "1">
<tr>
<%for (int i = 1; i <= j; ++i)
{ %>
<td>
<%=rs.getMetaData().getColumnName(i) %>
</td>
<% } %>
</tr>
<%while(rs.next())
{ %>
<tr>
<%for (int i = 1;i <= j; ++i)
{ %>
<td>
<%=rs.getString(i)%>
</td>
<% } %>
</tr>
<% } %>
</table>
<% }
}
if (!CommonDBBean.closeConn())
{ %>
<%=CommonDBBean.getHint() + "<p></p>" %>
<% } %>
</font>
</body>
</html>
import java.text.*;
import java.util.*;
import java.sql.*;
public class clsCDB
{
String sDBDriver = "";
String sConnStr = "";
String sHint = "";
ResultSet rs = null;
Connection conn = null;
Statement stmt = null;
public String getHint()
{
return sHint;
}
public void setDBDriver(String s)
{
sDBDriver = "" + s;
}
public String getDBDriver()
{
return sDBDriver;
}
public String getConnStr()
{
return sConnStr;
}
public void setConnStr(String s)
{
sConnStr = "" + s;
}
public ResultSet getResultSet()
{
return rs;
}
//Initialize the database
public boolean Initialization(String dbDrive,String dbConn)
{
sDBDriver = dbDrive;
sConnStr = dbConn;
return Initialization();
}
public boolean Initialization()
{
try
{
Class.forName(sDBDriver);
sHint = "Initialization sucessfully";
return true;
}
catch(java.lang.ClassNotFoundException e) {
sHint = "Initialization : " + e.getMessage();
return false;
}
}
//A common function perhaps usable
public String chkStr(String inStr)
{
StringBuffer result = new StringBuffer("");
char cc;
if (inStr != null)
{
for (int i = 0; i < inStr.length(); i++)
{
cc = inStr.charAt(i);
if (cc == ´´´)
{
result.append(´´´);
}
result.append(cc);
}
}
return result.toString();
}
//execute a SQL statement with recordset returned
public ResultSet executeQuery(String sql)
{
rs = null;
try
{
conn = DriverManager.getConnection(sConnStr);
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
}
catch(SQLException ex)
{
sHint = "executeQuery: " + ex.getMessage();
}
return rs;
}
//execute a SQL statement without returning recordset
public boolean executeUpdate(String sql)
{
try
{
conn = DriverManager.getConnection(sConnStr);
stmt = conn.createStatement();
stmt.executeUpdate(sql);
return true;
}
catch(SQLException ex)
{
sHint = "executeUpdate: " + ex.getMessage();
return false;
}
}
//Close connections
public boolean closeConn()
{
try
{
if (rs!=null)
rs.close();
if (stmt!=null)
stmt.close();
if (conn!=null)
conn.close();
return true;
}
catch(SQLException ex)
{
sHint = "closeConn: " + ex.getMessage();
return false;
}
}
}
测试用JSP文件
<%@ page language="java" import="java.sql.*" %>
<%@ page import = "pkgCDB.clsCDB"%>
<jsp:useBean id="CommonDBBean" class="pkgCDB.clsCDB" scope="session"/>
<html>
<head><title>Common Database Bean Test</title></head>
<body>
<font size=4>
<%
if ( (request.getParameter("DBDriver") == null)
// (request.getParameter("ConnStr") == null)
// (request.getParameter("SQLStr") == null) )
{ %>
<form method=get>
Input DBDriver: <input type=text name=DBDriver value="sun.jdbc.odbc.JdbcOdbcDriver">
<BR>
Input Connection String: <input type=text name=ConnStr value="jdbc:odbc:testBean">
Input SQL Query: <input type=text name=SQLStr value="select * from jobs">
<BR>
<input type=submit value="Submit">
</form>
<% }
else
{ %>
<% if (!CommonDBBean.Initialization(request.getParameter("DBDriver"),request.getParameter("ConnStr")))
{ %>
<%=CommonDBBean.getHint() + "<p></p>" %>
<% }
else
{ %>
<% ResultSet rs; %>
<% rs = CommonDBBean.executeQuery(request.getParameter("SQLStr")); %>
<%int j = rs.getMetaData().getColumnCount(); %>
<table BORDER = "1">
<tr>
<%for (int i = 1; i <= j; ++i)
{ %>
<td>
<%=rs.getMetaData().getColumnName(i) %>
</td>
<% } %>
</tr>
<%while(rs.next())
{ %>
<tr>
<%for (int i = 1;i <= j; ++i)
{ %>
<td>
<%=rs.getString(i)%>
</td>
<% } %>
</tr>
<% } %>
</table>
<% }
}
if (!CommonDBBean.closeConn())
{ %>
<%=CommonDBBean.getHint() + "<p></p>" %>
<% } %>
</font>
</body>
</html>
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