package dao;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import javax.servlet.ServletContext;
public class CommDAO
{
Connection conn = null;
public CommDAO()
{
conn = this.getConn();
}
private static Properties config = null;
static {
try {
config = new Properties();
// InputStream in = config.getClass().getResourceAsStream("dbconnection.properties");
InputStream in = CommDAO.class.getClassLoader().getResourceAsStream("dbconnection.properties");
config.load(in);
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public Connection getConn()
{
try
{
// Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
// String dburl = (String)config.get("dburl");
// String user = (String)config.get("username");
// String pwd = (String)config.get("password");
// String dataname=(String)config.get("dataname");
// //dburl = dburl+dataname;
// conn = DriverManager.getConnection(dburl,user,pwd);
String d = new Date().toLocaleString().substring(0,9);
Class.forName("com.mysql.jdbc.Driver");
String dburl = (String)config.get("dburl");
conn = DriverManager.getConnection(dburl,"root","12345");
}
catch(Exception e)
{
e.printStackTrace();
}
return conn;
}
public int getInt(String sql)
{
int i = 0;
try {
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(sql);
if(rs.next())
{
i = rs.getInt(1);
}
st.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return i;
}
public double getDouble(String sql)
{
double i = 0;
try {
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(sql);
if(rs.next())
{
i = rs.getDouble(1);
}
st.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return i;
}
public void commOper(String sql)
{
try {
Statement st = conn.createStatement();
st.execute(sql);
st.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void commOperSqls(ArrayList<String> sql)
{
try {
conn.setAutoCommit(false);
for(int i=0;i<sql.size();i++)
{
Statement st = conn.createStatement();
System.out.println(sql.get(i));
st.execute(sql.get(i));
st.close();
}
conn.commit();
} catch (SQLException e) {
try {
conn.rollback();
} catch (SQLException e1) {
e1.printStackTrace();
}
e.printStackTrace();
}finally{
try {
conn.setAutoCommit(true);
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public List<HashMap> select(String sql)
{
List<HashMap> list = new ArrayList();
try {
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(sql);
ResultSetMetaData rsmd = rs.getMetaData();
while(rs.next())
{
HashMap map = new HashMap();
int i = rsmd.getColumnCount();
for(int j=1;j<=i;j++)
{
if(!rsmd.getColumnName(j).equals("ID"))
map.put(rsmd.getColumnName(j), rs.getString(j));
else
map.put("id", rs.getString(j));
}
list.add(map);
}
rs.close();
st.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
public void close()
{
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 执行一条查询sql,以 List<hashmap> 的形式返回查询的记录，记录条数，和从第几条开始，由参数决定，主要用于翻页
* pageno 页码 rowsize 每页的条数
*/
public List select(String sql, int pageno, int rowsize) {
List<HashMap> list=new ArrayList<HashMap>();
List<HashMap> mlist=new ArrayList<HashMap>();
try{
list=this.select(sql);
int min = (pageno-1)*rowsize;
int max = pageno*rowsize;
for(int i=0;i<list.size();i++)
{
if(!(i<min||i>(max-1)))
{
mlist.add(list.get(i));
}
}
}catch(RuntimeException re){
re.printStackTrace();
throw re;
}
return mlist;
}
// 该方法返回一个table 用于流动图片
public String DynamicImage(String categoryid,int cut,int width,int height){
StringBuffer imgStr = new StringBuffer();
StringBuffer thePics1 = new StringBuffer();
StringBuffer theLinks1 = new StringBuffer();
StringBuffer theTexts1 = new StringBuffer();
imgStr.append("<div id=picViwer1 align=center></div><SCRIPT src='/studysite/js/dynamicImage.js' type=text/javascript></SCRIPT>\n<script language=JavaScript>\n");
thePics1.append("var thePics1=\n'");
theLinks1.append("var theLinks1='");
theTexts1.append("var theTexts1='");
List<HashMap> co = this.select("select * from news where title!='系统简介计算机课程管理系统' and title!='毕业设计栏目管理' order by id desc", 1, 6);
int j = 0;
int i = co.size();
for(HashMap b:co)
{
j++;
String id = b.get("id").toString();
String title = b.get("title").toString();
String url = "/studysite/upfile/"+b.get("picurl");
String purl = "";
if(j!=i){
thePics1.append(url.replaceAll("\n", "")+"|");
theLinks1.append(purl+"|");
theTexts1.append(title+"|");
}
if(j==i)
{
thePics1.append(url.replaceAll("\n", ""));
theLinks1.append("#");
theTexts1.append(title);
}
}
thePics1.append("';");
theLinks1.append("';");
theTexts1.append("';");
imgStr.append(thePics1+"\n");
imgStr.append(theLinks1+"\n");
imgStr.append(theTexts1+"\n");
imgStr.append("\n setPic(thePics1,theLinks1,theTexts1,"+width+","+height+",'picViwer1');</script>");
return imgStr.toString();
}
public static void main(String[] args) {
System.out.println(new CommDAO().select("select * from news where title!='系统简介计算机课程管理系统' order by id desc"));
}
}
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