import java.sql.*
/**
* @功能: 一个JDBC的本地化API连接类,封装了数据操作方法,只用传一个SQL语句即可
* @作者: 李开欢
* @日期: 2007/
*/
public class ConnectionDemo {
/*
* 这里可以将常量全部放入另一个类中,以方便修改
*/
private static Connection conn
private static Statement ps
private static ResultSet rs
private static final String DRIVER = "com.microsoft.jdbc.sqlserver.SQLServerDriver"
private static final String URL = "jdbc:microsoft:sqlserver://localhost:1433DatabaseName=mydb"
private static final String USER ="sa"
private static final String PASS = "sa"
public ConnectionDemo() {
// TODO Auto-generated constructor stub
ConnectionDemo.getConnection()
}
public static Connection getConnection(){
System.out.println("连接中...")
try {
Class.forName(ConnectionDemo.DRIVER)
conn = DriverManager.getConnection(ConnectionDemo.URL, ConnectionDemo.USER, ConnectionDemo.PASS)
System.out.println("成功连接")
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace()
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
return conn
}
public static Statement getStatement(String sql){
System.out.println("执行SQL语句中...")
try {
ps = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE)
if(sql.substring(0, 6).equals("select")){
rs = ps.executeQuery(sql)
System.out.println("执行完查询操作,结果已返回ResultSet集合")
}else if(sql.substring(0, 6).equals("delete")){
ps.executeUpdate(sql)
System.out.println("已执行完毕删除操作")
}else if(sql.substring(0, 6).equals("insert")){
ps.executeUpdate(sql)
System.out.println("已执行完毕增加操作")
}else{
ps.executeUpdate(sql)
System.out.println("已执行完毕更新操作")
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
return ps
}
public static ResultSet getResultSet(){
System.out.println("查询结果为:")
return rs
}
public static void closeConnection(){
System.out.println("关闭连接中...")
try {
if (rs != null) {
rs.close()
System.out.println("已关闭ResultSet")
}
if (ps != null) {
ps.close()
System.out.println("已关闭Statement")
}
if (conn != null) {
conn.close()
System.out.println("已关闭Connection")
}
} catch (Exception e) {
// TODO: handle exception
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
ConnectionDemo.getConnection()
String sql = "delete from type where id = 1"
ConnectionDemo.getStatement(sql)
String sql2 = "insert into type values(1,'教学设备')"
ConnectionDemo.getStatement(sql2)
String sql1 = "select * from type"
ConnectionDemo.getStatement(sql1)
ResultSet rs = ConnectionDemo.getResultSet()
System.out.println("编号 "+"类型")
try {
while(rs.next()){
System.out.print(" "+rs.getInt(1)+" ")
System.out.println(rs.getString(2))
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
ConnectionDemo.closeConnection()
}
}
1 将数据库的JDBC驱动加载到classpath中，在基于JAVAEE的WEB应用实际开发过程中，通常要把目标数据库产品的JDBC驱动复制到WEB-INF/lib下.2 加载JDBC驱动，并将其注册到DriverManager中，下面是一些主流数据库的JDBC驱动加裁注册的代码:
//Oracle8/8i/9iO数据库(thin模式)
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance()
//Sql Server7.0/2000数据库
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance()
//DB2数据库
Class.froName("com.ibm.db2.jdbc.app.DB2Driver").newInstance()
//Informix数据库
Class.forName("com.informix.jdbc.IfxDriver").newInstance()
//Sybase数据库
Class.forName("com.sybase.jdbc.SybDriver").newInstance()
//MySQL数据库
Class.forName("com.mysql.jdbc.Driver").newInstance()
//PostgreSQL数据库
Class.forNaem("org.postgresql.Driver").newInstance()
3 建立数据库连接，取得Connection对象.例如:
//Oracle8/8i/9i数据库(thin模式)
String url="jdbc:oracle:thin:@localhost:1521:orcl"
String user="scott"
String password="tiger"
Connection conn=DriverManager.getConnection(url,user,password)
-->完整的太多了！我已经把完整的代码发到你QQ邮箱了！
