ASP.NET使用C#数据库类连接Oracle数据库（包括增删改查各种操作）
在写之前，感谢一下这篇文章，就是因为看了这篇文章是怎么连接mysql的才学会的怎么连Oracle数据库
https://blog.csdn.net/qq_35560429/article/details/80316664
建立一个网站项目（或者用已有的），在网站文件下建立一个文件夹，新建一个db.cs文件。
db.cs文件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.OracleClient;
using System.Data;
namespace WebApplication2.appcode
{
public class db
{
public static OracleConnection CreatConnetion()
{
OracleConnection conn = new OracleConnection(@"Data Source=orcl;User ID=system;Password=a123456A");
return conn;
}
public static DataTable select(String sql)
{
OracleConnection conn = new OracleConnection(@"Data Source=orcl;User ID=system;Password=a123456A");
conn.Open();
OracleCommand cmd = new OracleCommand(sql, conn);
OracleDataAdapter oda = new OracleDataAdapter(cmd);
DataTable dt = new DataTable();
oda.Fill(dt);
conn.Close();
cmd.Dispose();
return dt;
}
//下面这个函数的意思就是delete from table where atribute = value;
//这里的tble、attribute和value是三个参数，自己看着输吧，注意这个value是字符串，在数据库里是varchar类型，如果删除int的话，自己改一下代码就好了！
//算了，我自己改：1.把最后一个String value的String 改成int value
// 2.把函数第三行的['" + value + "'"]改成[" + value]就欧克啦
public static int delete(String table,String attribute,String value)
{
try
{
OracleConnection conn = new OracleConnection(@"Data Source=orcl;User ID=system;Password=a123456A");
conn.Open();
String sql = "delete from " + table + " where " + attribute + " ='" + value + "'";
OracleCommand cmd = new OracleCommand(sql, conn);
OracleDataAdapter oda = new OracleDataAdapter(cmd);
DataTable dt = new DataTable();
oda.Fill(dt);
conn.Close();
cmd.Dispose();
return 0;//返回0就是删除成功！
}
catch (Exception ex)
{
//返回1就是删除失败！
return 1;
}
}
//下面这个函数的意思就是update table set atribute_alter = new_value where atribute = value;
//有点复杂哈，但是这样功能才齐全嘛。
//具体的不多说啦，主要是修改varchar类型的，所以多用varchar,改成int参照delete函数好了。（其实可以写两个，一个改varchar,一个改int我赶脚数据库里这两种类型够用了
public static int update(String table, String attribute_alter, String new_value,String attribute,String value)
{
try
{
OracleConnection conn = new OracleConnection(@"Data Source=orcl;User ID=system;Password=a123456A");
conn.Open();
String sql = "update " + table + " set " + attribute_alter + " ='" + new_value + "'where "+attribute+" = '"+value+"'";
OracleCommand cmd = new OracleCommand(sql, conn);
OracleDataAdapter oda = new OracleDataAdapter(cmd);
DataTable dt = new DataTable();
oda.Fill(dt);
conn.Close();
cmd.Dispose();
return 0;//返回0就是修改成功！
}
catch (Exception ex)
{
//返回1就是修改失败！
return 1;
}
}
//由于插入比较复杂涉及到多个值甚至多个不同类型的值，这里写了改两列数据的，需要用时在这里修改
//其实更建议直接用上面的select()因为这个小括号里可以直接输入语句，自然也可输入insert语句了比较灵活
public static int insert(String table,String [] attributes,String []values )
{
OracleConnection conn = new OracleConnection(@"Data Source=orcl;User ID=system;Password=a123456A");
conn.Open();
String sql = "insert into " + table + " （" + attributes[0] + "," + attributes[1] + ") values(" + values[0] + "," + values[1] + ")";
OracleCommand cmd = new OracleCommand(sql, conn);
OracleDataAdapter oda = new OracleDataAdapter(cmd);
DataTable dt = new DataTable();
oda.Fill(dt);
conn.Close();
cmd.Dispose();
return 0;
}
//为了灵活起见下面直接给一个输入语句的通用方法
public static int sql(String sql)
{
OracleConnection conn = new OracleConnection(@"Data Source=orcl;User ID=system;Password=a123456A");
conn.Open();
OracleCommand cmd = new OracleCommand(sql, conn);
OracleDataAdapter oda = new OracleDataAdapter(cmd);
DataTable dt = new DataTable();
oda.Fill(dt);
conn.Close();
cmd.Dispose();
return 0;
}
}
}login.aspx文件
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="login.aspx.cs" Inherits="WebApplication2.WebForm1" %>
login.aspx.cs文件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.OracleClient;
using WebApplication2.appcode;
using System.Data;
namespace WebApplication2
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
db db = new db();
String sql = "select * from student where sno = '"+TextBox1.Text+"'";
DataTable dt = db.select(sql);
if (dt.Rows.Count == 1)
{
Response.Write(@"");
}else if (dt.Rows.Count == 0)
{
Response.Write(@"");
}
GridView1.DataBind();
}
catch (Exception ex)
{
Response.Write(ex);
}
}
protected void Button2_Click(object sender, EventArgs e)
{
try
{
db db = new db();
int isDelete = db.delete("student","sno",TextBox1.Text);
if ( isDelete == 1)
{
Response.Write(@"");
}
else if (isDelete == 0)
{
Response.Write(@"");
}
GridView1.DataBind();
}
catch (Exception ex)
{
Response.Write(ex);
}
}
protected void Button3_Click(object sender, EventArgs e)
{
try
{
db db = new db();
int isUpdate = db.update("student", "sno", TextBox2.Text,"sno",TextBox1.Text);
if (isUpdate == 1)
{
Response.Write(@"");
}
else if (isUpdate == 0)
{
Response.Write(@"");
}
GridView1.DataBind();
}
catch (Exception ex)
{
Response.Write(ex);
}
}
protected void Button4_Click(object sender, EventArgs e)
{
try
{
db db = new db();
String []attributes = {"sno","sname","tc"};
String[] values = { TextBox1.Text, TextBox2.Text,"60" };
int isInsert = db.insert("student", attributes,values);
if (isInsert == 1)
{
Response.Write(@"");
}
else if (isInsert == 0)
{
Response.Write(@"");
}
GridView1.DataBind();
}
catch (Exception ex)
{
Response.Write(ex);
}
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
}