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来源 : http://blog.csdn.net/cm4ever/
<%@ page contentType="text/html;charset=gb2312"%><%@ page import="java.sql.*"%><% String result = ""; // 查询结果字符串 String sql = "select * from test"; // SQL 字符串 // 连接字符串,格式: "jdbc:数据库驱动名称:连接模式:@数据库服务器ip:端口号:数据库SID" String url = "jdbc:oracle:thin:@localhost:1521:orcl"; String username = "scott"; // 用户名 String password = "tiger"; //密码 // 创建oracle数据库驱动实例 Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); // 获得与数据库的连接 Connection conn = DriverManager.getConnection(url, username, password); // 创建执行语句对象 Statement stmt = conn.createStatement(); // 执行sql语句,返回结果集 ResultSet rs = stmt.executeQuery(sql); while ( rs.next() ) { result += "\n 第一个字段内容:" + rs.getString(1) + "<BR>"; } rs.close(); // 关闭结果集 stmt.close(); // 关闭执行语句对象 conn.close(); // 关闭与数据库的连接%><HTML><BODY> <%=result%></BODY></HTML>
<%@ page contentType="text/html;charset=gb2312"%><%@ page import="java.sql.*"%><% String sql = "select * from test"; // 连接字符串,格式: "jdbc:公司名称:数据库驱动名称://数据库服务器ip:端口号;DatabaseName=数据库名称" String url = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=pubs"; String username = "scott"; String password = "tiger"; Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance(); Connection conn = DriverManager.getConnection(url, username, password); Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); ResultSet rs = stmt.executeQuery(sql);%><HTML><BODY><% while ( rs.next() ) { %> 第一个字段内容为:<%=rs.getStrisng(1)%><BR> <% } rs.close(); stmt.close(); conn.close();%></BODY></HTML>
<%@ page contentType="text/html;charset=gb2312"%><%@ page import="java.sql.*"%><% String sql = "select * from test"; // 连接字符串,格式: "jdbc:数据库驱动名称://数据库服务器ip:端口号/数据库名称" String url = "jdbc:db2://localhost:5000/sample"; String username = "scott"; String password = "tiger"; Class.forName("com.ibm.db2.jdbc.app.DB2Driver").newInstance(); Connection conn = DriverManager.getConnection(url, username, password); Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); ResultSet rs = stmt.executeQuery(sql); rs.close(); stmt.close(); conn.close();%>
<%@ page contentType="text/html;charset=gb2312"%><%@ page import="java.sql.*"%><% String sql = "select * from test"; // 连接字符串,格式: "jdbc:数据库驱动名称://数据库服务器ip:端口号/数据库名称:INFORMIXSERVER=服务器名;user=用户名;password=密码" String url = "jdbc:informix-sqli://123.45.67.89:1533/testDB:INFORMIXSERVER=myserver;user=testuser;password=testpassword"; Class.forName("com.informix.jdbc.IfxDriver").newInstance(); Connection conn = DriverManager.getConnection(url); Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); ResultSet rs = stmt.executeQuery(sql); rs.close(); stmt.close(); conn.close();%>
<%@ page contentType="text/html;charset=gb2312"%><%@ page import="java.sql.*"%><% String sql = "select * from test"; // 连接字符串,格式: "jdbc:公司名称:数据库驱动名称:数据库服务器ip:端口号/数据库名称" String url = "jdbc:sybase:Tds:localhost:5007/tsdata";Properties prop = System.getProperties();prop.put("user", "userid"); // 用户名prop.put("password", "user_password"); // 密码 Class.forName("com.sybase.jdbc.SybDriver").newInstance(); Connection conn = DriverManager.getConnection(url, prop); Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); ResultSet rs = stmt.executeQuery(sql); rs.close(); stmt.close(); conn.close();%>
<%@ page contentType="text/html;charset=gb2312"%><%@ page import="java.sql.*"%><% String sql = "select * from test"; // 连接字符串,格式: "jdbc:数据库驱动名称://数据库服务器ip/数据库名称?user=用户名&password=密码&使用Unicode=布尔值&字符编码=编码" String url = "jdbc:mysql://localhost/softforum?user=soft&password=soft1234&useUnicode=true&characterEncoding=8859_1"; String username = "scott"; String password = "tiger"; Class.forName("org.gjt.mm.mysql.Driver").newInstance(); Connection conn = DriverManager.getConnection(url, username, password); Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); ResultSet rs = stmt.executeQuery(sql); rs.close(); stmt.close(); conn.close();%>
<%@ page contentType="text/html;charset=gb2312"%><%@ page import="java.sql.*"%><% String sql = "select * from test"; // 连接字符串,格式: "jdbc:数据库驱动名称://数据库服务器ip/数据库名称" String url = "jdbc:postgresql://localhost/soft"; String username = "scott"; String password = "tiger"; Class.forName(""org.postgresql.Driver").newInstance(); Connection conn = DriverManager.getConnection(url, username, password); Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); ResultSet rs = stmt.executeQuery(sql); rs.close(); stmt.close(); conn.close();%>
下面是简单的数据库操作Javabean的代码:
import java.sql.*;import java.util.*;publicclass DbWrapper {// 定义连接池对象为静态变量,将一直存在,直到工作目录关闭。privatestatic DataSource ds =null;// 1.用连接池的方式获得连接// 如果不是做多数据库程序,推荐使用此方法// 相关内容:在tomcat管理界面配置连接池publicstatic Connection openConnection()throws Exception {// 只需要初始化1次if( ds ==null){ Context initContext =newInitialContext(); Context envContext =(Context) initContext.lookup("java:/comp/env"); DataSource ds =(DataSource) envContext.lookup("jdbc/MyDataSource");}return ds.getConnection();}// 2.用jdbc驱动获得连接// 相关内容:JSP数据库连接大全publicstatic Connection openConnection( String driver, String url, String username, String password)throws Exception { Class.forName(driver).newInstance();return DriverManager.getConnection(url, username, password);}publicstaticvoidcloseConnection(Connection conn)throws Exception {if( conn !=null){ conn.close();}}publicstaticintexecuteUpdate(String sql)throws Exception {int count =0; Connection conn =null; Statement stmt =null;try{ conn =openConnection(); stmt = conn.createStatement(); count = stmt.executeUpdate(sql);}catch( Exception e ){throw e;}finally{closeConnection(conn);}return count;}publicstatic List executeQuery(String sql)throws Exception { List list =newArrayList(); Connection conn =null; Statement stmt =null; ResultSet rs =null;try{ conn =openConnection(); stmt = conn.createStatement(); rs = stmt.executeQuery(sql); ResultSetMetaData rsmd = rs.getMetaData();while( rs.next()){ Map map =newHashMap();for(int i =1; i <= rsmd.getColumnCount(); i++){ map.put(rsmd.getColumnName(i), rs.getObject(i));} list.add(map);}}catch( Exception e ){ e.printStackTrace();}finally{if( rs !=null) rs.close();closeConnection(conn);}return list;}}
// 1.对于insert, update, delete语句int count = DbWrapper.executeUpdate(sql);// 2.对于selete语句 java.util.List list = DbWrapper.executeQuery(sql);// 方法一:按名字取值,注意大小写是严格区分的for(int i =0; i < list.size(); i++){ java.util.Map map =(java.util.Map)list.get(i); out.println(mag.get("column_name").toString());}// 方法二:遍历取值for(int i =0; i < list.size(); i++){ java.util.Map map =(java.util.Map)list.get(i);for(java.util.Iterator it = map.keySet().iterator(); it.hasNext();){ String column_name = it.next().toString());// 取值时注意null判断 out.println(column_name +" = "+ map.get(column_name) ==null?"": map.get(column_name).toString());}}
来源: http://blog.csdn.net/cm4ever/
posted on 2006-04-26 22:26 record java and net 阅读(3016) 评论(0) 编辑 收藏 所属分类: 转载的文章