一个专门实现访问sql server数据库增删改查的操作代码，分享给大家，具体内容如下
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using system;using system.collections.generic;using system.componentmodel;using system.data;using system.drawing;using system.linq;using system.text;using system.windows.forms;using system.data;using system.data.sqlclient;namespace windowsformsapplication1{ public partial class form1 : form { public form1() { initializecomponent(); } //查询 private void button1_click(object sender, eventargs e) { string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";//定义数据库连接参数 sqlconnection myconnection = new sqlconnection(myconn);//定义一个数据连接实例 sqlcommand mycommand = new sqlcommand("select * from 图书借阅", myconnection); //定义一个数据库操作指令 sqldataadapter selectadapter = new sqldataadapter();//定义一个数据适配器 selectadapter.selectcommand = mycommand;//定义数据适配器的操作指令 dataset mydataset = new dataset();//定义一个数据集 myconnection.open();//打开数据库连接 selectadapter.selectcommand.executenonquery();//执行数据库查询指令 myconnection.close();//关闭数据库 selectadapter.fill(mydataset);//填充数据集 datagrid1.datasource = mydataset.tables[0]; //datagrid1.databind();//将数据表格用数据集中的数据填充 } //添加 private void button2_click(object sender, eventargs e) { string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no"; sqlconnection myconnection = new sqlconnection(myconn); string myinsert = "insert into 图书借阅 (图书编号,读者编号,续借次数) values ('" + convert.tostring(textbox2.text) + "','" + convert.tostring(textbox3.text)+ "','"+convert.toint32(textbox4.text)+ "')"; sqlcommand mycommand = new sqlcommand(myinsert, myconnection); try//异常处理 { myconnection.open(); mycommand.executenonquery(); myconnection.close(); } catch (exception ex) { messagebox.show(ex.message); } } //更新 private void button3_click(object sender, eventargs e) { string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no"; sqlconnection myconnection = new sqlconnection(myconn); string myupdate = "update 图书借阅 set 操作员='" + textbox2.text + "'" + " where 借阅编号=" + "'" + textbox1.text + "'"; sqlcommand mycommand = new sqlcommand(myupdate, myconnection); try { myconnection.open(); mycommand.executenonquery(); myconnection.close(); textbox1.text = ""; } catch (exception ex) { messagebox.show(ex.message); } } //删除 private void button4_click(object sender, eventargs e) { string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no"; sqlconnection myconnection = new sqlconnection(myconn); string mydelete = "delete from 图书借阅 where 借阅编号=" + textbox1.text; sqlcommand mycommand = new sqlcommand(mydelete, myconnection); try { myconnection.open(); mycommand.executenonquery(); myconnection.close(); textbox1.text = ""; } catch (exception ex) { messagebox.show(ex.message); } } }} |
数据库如下；
winform中查询成功；
插入时，因为借阅编号为自增，不能插入值，会自己生成；
更新，外键冲突；插入的图书编号为000999，无此图书，故出错；
插入成功；
更新操作员为"王老师"；
删除借阅编号为31的记录；
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
