Java JDBC实现数据库的增删改查操作
主要有三部分组成：一：连接驱动。 二：Model对象。 三：实现类
连接驱动：这里连接的是sybase数据库。不同数据库请添加相应的驱动以及连接。
package testJDBC;
import java.sql.Connection;
import java.sql.DriverManager;
public class DataBaseConn {
public static Connection getDbConn() throws Exception {
Connection conn = null;
try {
Class.forName("com.sybase.jdbc3.jdbc.SybDriver");
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("Can not find DataBase 驱动！");
e.printStackTrace();
}
try {
conn = DriverManager.getConnection(
"jdbc:sybase:Tds:***.***.***.***:端口号/DB名称", "用户名",
"密码");
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("Database Connect Errror !!!");
e.printStackTrace();
}
return conn;
}
}
model对象：
package testJDBC;
import java.io.Serializable;
import java.util.Date;
/**
* @author fl
*/
@SuppressWarnings("serial")
public class NoteModel implements Serializable{
private Long id;
private String ip;
private String visiturl;
private String param;
private Date visittime;
// 这里的get()、set()方法
}
实现类：这里有个需要注意的就是对时间的处理。java.sql.Date 和 java.util.Date是不相同的。
java.sql.Date 只是用于SQl语句，只有日期没有时间。
java.util.Date 用于除SQl语句外的所有日期处理。
java.util.Date 是 java.sql.Date 的父类。
转化：
java.sql.Date sDate = new java.sql.Date();
java.util.Date date = new java.util.Date(dDate.getTime(0);
-------------------------------------------------------------------------------------------------------
package testJDBC;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class operClass {
//添加数据
public static boolean createNote(NoteModel nm,String tableName){
PreparedStatement ps = null;
String sql = "insert into "+tableName+"(IP,VISITURL,PARAM,VISITTIME) values (?,?,?,?)";
Connection conn = null;
try {
conn = DataBaseConn.getDbConn();
ps = conn.prepareStatement(sql);
ps.setString(1,nm.getIp());
ps.setString(2,nm.getVisiturl());
ps.setString(3,nm.getParam());
ps.setDate(4,(java.sql.Date) nm.getVisittime());
ps.execute();
ps.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return true;
}
//修改数据
public static boolean updateNote(NoteModel nm,String tableName){
//这样携带参数，注意引号附近的空格。
String sql = "update "+tableName+" SET PARAM=?, IP=? where ID = ?";
Connection conn= null;
PreparedStatement ps = null;
try {
conn = DataBaseConn.getDbConn();
ps = conn.prepareStatement(sql);
ps.setString(1,nm.getParam());
ps.setString(2,nm.getIp());
ps.setLong(3,nm.getId());
ps.executeUpdate();
ps.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return true;
}
//删除数据
public static boolean delete(NoteModel nm,String tableName){
//利用?作为占位符
String sql="delete from "+tableName+" where ID=?";
//1:首先声明 连接对象
Connection conn = null;
//2:声明预编译的PreparedStatement对象
PreparedStatement ps = null;
try {
//3:设置连接对象参数
conn = DataBaseConn.getDbConn();
//4: 设置预编译的Sql语句
ps=conn.prepareStatement(sql);
ps.setLong(1,nm.getId());
//5:执行
ps.executeUpdate();
// 6：关闭
ps.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return true;
}
//按照主键查询
public static NoteModel queryById(NoteModel nm,String tableName){
NoteModel getNm = new NoteModel();
String sql = "select ID,IP,VISITURL,PARAM,VISITTIME from "+tableName+" where ID=?";
Connection conn = null;
PreparedStatement ps = null;
try {
conn = DataBaseConn.getDbConn();
ps = conn.prepareStatement(sql);
ps.setLong(1,nm.getId());
//取得返回值. 游标
ResultSet rs =ps.executeQuery();
if(rs.next()){
getNm.setId(rs.getLong(1));
getNm.setIp(rs.getString(2));
getNm.setVisiturl(rs.getString(3));
getNm.setParam(rs.getString(4));
getNm.setVisittime(rs.getDate(5));
}
//关闭
rs.close();
ps.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return getNm;
}
//查询全部数据
public static List queryList(String tableName){
List list = new ArrayList();
String sql = "select ID,IP,VISITURL,PARAM,VISITTIME from "+tableName;
Connection conn = null;
PreparedStatement ps = null;
try {
conn = DataBaseConn.getDbConn();
ps = conn.prepareStatement(sql);
// 返回结果集
ResultSet rs = ps.executeQuery();
while(rs.next()){
NoteModel getNm = new NoteModel();
getNm.setId(rs.getLong(1));
getNm.setIp(rs.getString(2));
getNm.setVisiturl(rs.getString(3));
getNm.setParam(rs.getString(4));
getNm.setVisittime(rs.getDate(5));
list.add(getNm);
}
rs.close();
ps.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return list;
}
//按照条件查询
public static List queryByOCndtion(NoteModel nm,String tableName){
List list = new ArrayList();
String sql = "select ID,IP,VISITURL,PARAM,VISITTIME from "+tableName+" where 1=1 ";
Connection conn = null;
PreparedStatement ps = null;
try {
conn = DataBaseConn.getDbConn();
//这里因为是做的动态查询，所以要做一个通用 的Sql语句的拼接
ps = conn.prepareStatement(getSql(nm,sql));
//设置参数值
setPrepredStatement(ps,nm);
ResultSet rs = ps.executeQuery();
while(rs.next()){
NoteModel getNm = new NoteModel();
getNm.setId(rs.getLong(1));
getNm.setIp(rs.getString(2));
getNm.setVisiturl(rs.getString(3));
getNm.setParam(rs.getString(4));
getNm.setVisittime(rs.getDate(5));
list.add(getNm);
}
rs.close();
ps.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
//拼接SQL语句
public static String getSql(NoteModel nm,String sql){
if(nm.getIp() != null && nm.getIp().trim().length() >0){
sql+="and IP = ? ";
}
if(nm.getParam() != null && nm.getParam().trim().length() >0){
sql+="and PARAM like ? ";
}
if(nm.getVisiturl() != null && nm.getVisiturl().trim().length() > 0){
sql+="and VISITURL like ? ";
}
System.out.println("sql: "+sql);
return sql;
}
//确定参数位置
public static PreparedStatement setPrepredStatement(PreparedStatement ps,NoteModel nm)throws Exception{
int count = 1;
if(nm.getIp() != null && nm.getIp().trim().length() >0){
ps.setString(count,nm.getIp());
count ++;
}
if(nm.getParam() != null && nm.getParam().trim().length() >0){
// 百分号一定要拼接在这里，整体作为一个参数。
ps.setString(count,"%"+nm.getParam()+"%");
count ++;
}
if(nm.getVisiturl() != null && nm.getVisiturl().trim().length() > 0){
ps.setString(count,"%"+nm.getVisiturl()+"%");
count ++;
}
return ps;
}
//测试函数
public static void main(String[] args) {
String tableName="Record_UserVisit20100821";
NoteModel nmM = new NoteModel();
nmM.setIp("789.789.789.789");
nmM.setParam("asdf");
nmM.setVisiturl("qwer");
List list=queryByOCndtion(nmM,tableName);
System.out.println(list.size());
for(int i =0;i
NoteModel nm = (NoteModel) list.get(i);
System.out.println("ID:"+nm.getId()+", IP:"+nm.getIp()+", param:"+nm.getParam()+", data:"+nm.getVisittime()+", url:"+nm.getVisiturl());
}
NoteModel nm = new NoteModel();
nm.setIp("789.456.123.963");
nm.setParam("name=2B&sex=m");
nm.setVisiturl("www.b2bjoy.com");
Date date = new Date();
java.sql.Date sDate = new java.sql.Date(date.getTime());
nm.setVisittime(sDate);
}
}