HTML数据库编程、JavaScript数据库编程

<html>
<head>

<script language="javascript">
//创建数据表
var tablesqls=new Array(
"CREATE TABLE user([id] AUTOINCREMENT,[username] TEXT(50),[userid] TEXT(50) NOT NULL,PRIMARY KEY ([id]))"
);

//初始化数据
var initsqls=new Array(
"insert into user(userid) values('i687')",
"insert into user(userid) values('dudufay')",
"insert into user(userid) values('daisyfairy')",
"insert into user(userid) values('lifeng9552056')",
"insert into user(userid) values('du00')",
"insert into user(userid) values('joycle')",
"insert into user(userid) values('beuta')",
"insert into user(userid) values('xiaolanfangxiao')",
"insert into user(userid) values('yinruxue_-')",
"insert into user(userid) values('qixiaofei00')",
"insert into user(userid) values('skirty')",
"insert into user(userid) values('eveningprimrose')",
"insert into user(userid) values('riotgrrrl')",
"insert into user(userid) values('ghee')",
"insert into user(userid) values('coolzee')",
"insert into user(userid) values('anglo520')",
"insert into user(userid) values('bianguai')",
"insert into user(userid) values('bethhubing')",
"insert into user(userid) values('weixin622')",
"insert into user(userid) values('qiofei')",
"insert into user(userid) values('marksman1019361')",
"insert into user(userid) values('helb520')",
"insert into user(userid) values('zhaoying8225')",
"insert into user(userid) values('ticigi')",
"insert into user(userid) values('lemontea_520')"
);

//获取当前目录位置
function geturlpath(myurl){
var pos1;
var tempstr;
myurl=myurl.replace("file:///","");
myurl=myurl.replace("\\","/");
myurl=myurl.replace(/%20/g," ");
pos1=myurl.lastIndexOf("/");
tempstr=myurl.substring(0,pos1+1);
return tempstr;
}
var basepath=geturlpath(window.location.href);
var dbpath=basepath+"avatar.mdb";

var baseconn2k="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=";
var baseconn97="Provider=Microsoft.Jet.OLEDB.3.51;Data Source=";
var baseconn="driver={Microsoft Access Driver (*.mdb)};dbq=";

var connstr,conn,sql;
//document.write(dbpath);

//创建Access数据库文件
function createdb(filename,ver){
var CreateAccess=new ActiveXObject("ADOX.Catalog");
if (ver=="97"){
//创建Access97格式的数据库
CreateAccess.Create(baseconn97+filename+";");
}else{
//创建Access2000格式的数据库
CreateAccess.Create(baseconn2k+filename+";");
}
}

//运行SQL列表
function runsqls(sqlarray){
var sql="";
for (var i=0;i<sqlarray.length;i++){
sql=sqlarray[i];
if ((sql!="")&&(sql!=null)){
//alert(sql);
conn.execute(sql);
}
}
}

//判断文件是否存在
function FileExists(strFile){
var objTextStream = new ActiveXObject("ADODB.Stream");
objTextStream.open;
try{
objTextStream.LoadFromFile(strFile);
return true;
}
catch(Exception)
{
return false;
}
objTextStream.close;
}

//初始化数据库连接
function createconn(filename){
var tempresult=true;
connstr=baseconn+filename+";";
try{
conn = new ActiveXObject("ADODB.Connection");

//如果不存在先创建数据库
if (!(FileExists(dbpath))){
createdb(dbpath,"2k");
//alert("创建数据库成功！");
conn.open(connstr);
runsqls(tablesqls);
//alert("创建数据表成功！");
runsqls(initsqls);
//alert("数据初始化完毕");
}else{
conn.open(connstr);
//alert("打开数据库成功！");
}
}
catch(Exception)
{
tempresult=false;
}
return tempresult;
}

//提取数据库数据合成函数
baseurl="http://avatar.etang.com/info/avatarhead.asp";
function genurls(){
var names,narray,i;
sql="select userid from user";
var rs = new ActiveXObject("ADODB.RecordSet");
rs.open(sql,conn,1);
names="";
while (!rs.EOF){
if (names!=""){
names=names+" "+rs("userid").value;
}else{
names=rs("userid").value;
}
rs.moveNext();
}
rs.Close();
conn.Close();

narray=names.split(" ")
for (var i=1;i<=narray.length;i++){
document.write("<iframe frameborder=0 src='"+baseurl+"?name="+narray[i]+"&type=0"+"' width=126 height=156></iframe>");
}
}
</script>
</head>
<body>

<script language="javascript">
var treturn=createconn(dbpath);
if (treturn){
genurls();
}else{
alert("数据库初始化失败！");
}
</script>
</body>
</html>