js实现对数据库的增删查改

1.查询
复制代码代码如下:

<HTML> 
<HEAD> 
<TITLE>数据查询</TITLE> 
<Script > 
var conn = new ActiveXObject("ADODB.Connection"); 
conn.Open("DBQ=f://abc.mdb;DRIVER={Microsoft Access Driver (*.mdb)};"); 
var rs = new ActiveXObject("ADODB.Recordset"); 
var sql="select * from Student"; 
rs.open(sql, conn); 
var html=""; 
while(!rs.EOF) 
{  
html=html+rs.Fields("Id")+" "+rs.Fields("stuName"); 
rs.moveNext(); 
} 
document.write(html); 
rs.close(); 
rs = null; 
conn.close(); 
conn = null; 
</script> 
</HEAD> 
<BODY> 
</BODY> 
</HTML>

View Code

2.增加操作
复制代码代码如下:

<HTML> 
<HEAD> 
<TITLE>增加操作</TITLE> 
<script language="javascript"> 
function addUser(id,stuName) 
{ 
//用 JavaScript 写服务器端连接数据库的代码示例 
var conn = new ActiveXObject("ADODB.Connection"); 
conn.Open("DBQ=F://abc.mdb;DRIVER={Microsoft Access Driver (*.mdb)};"); 
var sql="insert into Student(ID,stuName) values("+id+",'"+stuName+"')"; 
try{ 
conn.execute(sql); 
alert("添加成功"); 
} 
catch(e){ 
document.write(e.description); 
alert("添加失败~~~"); 
} 
conn.close(); 
} 
</script> 
</HEAD> 
<BODY> 
<table width=100 border=1> 
<tr bgcolor='#f4f4f4'> 
<td>编号</td> 
<td>姓名</td> 
</tr> 
<tr> 
<td><input id="stuId" /></td> 
<td><input id="stuName"/></td> 
</tr> 
</table> 
<input name="1" type="button" value="添加" onclick="addUser(stuId.value,stuName.value)"/> 
</BODY> 
</HTML>

View Code

3.删除操作
复制代码代码如下:

<HTML> 
<HEAD> 
<TITLE>删除操作</TITLE> 
<script language="javascript"> 
function delStu(id) 
{ 
var conn = new ActiveXObject("ADODB.Connection"); 
conn.Open("DBQ=F://abc.mdb;DRIVER={Microsoft Access Driver (*.mdb)};"); 
var sql="delete from Student where Id=2"; 
conn.execute(sql); 
conn.close(); 
conn = null; 
alert("修改成功"); 
} 
</script> 
</HEAD> 
<BODY> 
<input name="1" type="button" value="删除" onclick="delStu(1)"/> 
</BODY> 
</HTML>

View Code

4.修改操作
复制代码代码如下:

<HTML> 
<HEAD> 
<TITLE>修改操作 </TITLE> 
</HEAD> 
<script> 
function updateUser(userId,userName) 
{ 
var conn = new ActiveXObject("ADODB.Connection"); 
conn.Open("DBQ=F://abc.mdb;DRIVER={Microsoft Access Driver (*.mdb)};"); 
var rs = new ActiveXObject("ADODB.Recordset"); 
var sql="update Student set stuName='" + userName + "' where Id=" + userId + ""; 
conn.execute(sql); 
conn.close(); 
conn = null; 
alert("修改成功"); 
} 
</script> 
<BODY> 
<table width=100 border=1> 
<tr bgcolor='#f4f4f4'> 
<td>编号</td> 
<td>姓名</td> 
</tr> 
<tr> 
<td><input id="stuId" /></td> 
<td><input id="stuName"/></td> 
</tr> 
</table> 
<input name="1" type="button" value="修改" onclick="updateUser(stuId.value,stuName.value)"/> 
</BODY> 
</HTML>

View Code

另外，JS也可以操作SQL Server数据库
数据库名为：MySchool，表名为Student，StudentId为int类型，自增列，studentName为学生姓名，为varchar类型。数据库用户名为sa，密码是ok，
复制代码代码如下:

<HTML> 
<HEAD> 
<TITLE>SQL数据查询</TITLE> 
<Script > 
var conn = new ActiveXObject("ADODB.Connection"); 
conn.Open("Driver={SQL server};Server=.;DataBase=MySchool;UID=sa;Password=ok;");//打开数据库 
var rs = new ActiveXObject("ADODB.Recordset"); 
var sql="select * from Student"; 
rs.open(sql, conn); 
var html=""; 
while(!rs.EOF) 
{ 
html=html+rs.Fields("StudentId")+" "+rs.Fields("studentName")+"<br/>"; 
rs.moveNext(); 
} 
document.write(html); 
rs.close(); 
rs = null; 
conn.close(); 
conn = null; 
</script> 
</HEAD> 
<BODY> 
</BODY> 
</HTML>

View Code