asp.net 数据库连接代码(c#)完整代码

using System;

using SystemData;

using SystemDataSqlClient;

using SystemConfiguration;

using SystemCollections;

using SystemWeb;

namespace SQLFunctionDBHelper

{

public abstract class SqlHelper

{

public static readonly string CONN_STRING = ConfigurationManagerConnectionStrings["SqlConnString"]ConnectionString;

public static int ExecuteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] cmdParams)

{

SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(CONN_STRING))

{

PrepareCommand(cmd, conn, cmdType, cmdText, cmdParams);

int val = cmdExecuteNonQuery();

cmdParametersClear();

return val;

}

}

public static int ExecuteNonQuery(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParams)

{

SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, conn, cmdType, cmdText, cmdParams);

int val = cmdExecuteNonQuery();

cmdParametersClear();

return val;

}

public static SqlDataReader ExecuteReader(CommandType cmdType, string cmdText, params SqlParameter[] cmdParams)

{

SqlCommand cmd = new SqlCommand();

SqlConnection conn = new SqlConnection(CONN_STRING);

try

{

PrepareCommand(cmd, conn, cmdType, cmdText, cmdParams);

SqlDataReader rdr = cmdExecuteReader(CommandBehaviorCloseConnection);

cmdParametersClear();

return rdr;

}

catch

{

connClose();

throw;

}

}

public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] cmdParams)

{

SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(CONN_STRING))

{

PrepareCommand(cmd, conn, cmdType, cmdText, cmdParams);

object val = cmdExecuteScalar();

cmdParametersClear();

return val;

}

}

public static object ExecuteScalar(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParams)

{

SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, conn, cmdType, cmdText, cmdParams);

object val = cmdExecuteScalar();

cmdParametersClear();

return val;

}

public static DataSet Fill(CommandType cmdType, string cmdText, params SqlParameter[] cmdParams)

{

SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(CONN_STRING))

{

PrepareCommand(cmd, conn, cmdType, cmdText, cmdParams);

SqlDataAdapter adapter = new SqlDataAdapter(cmd);

DataSet ds = new DataSet();

adapterFill(ds);

return ds;

}

}

private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, CommandType cmdType, string cmdText, SqlParameter[] cmdParams)

{

if (connState != ConnectionStateOpen)

connOpen();

cmdConnection = conn;

cmdCommandType = cmdType;

cmdCommandText = cmdText;

if (cmdParams != null)

{

foreach (SqlParameter param in cmdParams)

cmdParametersAdd(param);

}

}

}

}

ASPNET20的 读取配置文件中的数据库连接字符串"SqlConnString"

可能没看懂这个封装可以直接引用 ExecuteNonQuery执行UPdate,DELETE 等SQL语句返回影响多少记录,ExecuteReader执行一个查询语句返回SqlDataReader ,ExecuteScalar 执行执行SQL返回一个结果为object类型,Fill返回一个DATASET记录集,传递参数

(CommandType[TEXT/StoredProcedure],[SQL语句/存储过程名],[SqlParameter/没有则null])所以这个函数既可以执行存储过程也可用足普通SQL

import javasql;

public class DataBasePractice {

public static void main(String[] args) {

//声明Connection对象

Connection con;

//驱动程序名

String driver = "commysqljdbcDriver";

//URL指向要访问的数据库名mydata

String url = "jdbc:mysql://localhost:3306/mydata";

//MySQL配置时的用户名

String user = "root";

//MySQL配置时的密码

String password = "root";

//遍历查询结果集

try {

//加载驱动程序

ClassforName(driver);

//1getConnection()方法，连接MySQL数据库！！

con = DriverManagergetConnection(url,user,password);

if(!conisClosed())

Systemoutprintln("Succeeded connecting to the Database!");

//2创建statement类对象，用来执行SQL语句！！

Statement statement = concreateStatement();

//要执行的SQL语句

String sql = "select from student";

//3ResultSet类，用来存放获取的结果集！！

ResultSet rs = statementexecuteQuery(sql);

Systemoutprintln("-----------------");

Systemoutprintln("执行结果如下所示:");

Systemoutprintln("-----------------");

Systemoutprintln(" 学号" + "\t" + " 姓名");

Systemoutprintln("-----------------");

String name = null;

String id = null;

while(rsnext()){

//获取stuname这列数据

name = rsgetString("stuname");

//获取stuid这列数据

id = rsgetString("stuid");

//首先使用ISO-8859-1字符集将name解码为字节序列并将结果存储新的字节数组中。

//然后使用GB2312字符集解码指定的字节数组。

name = new String(namegetBytes("ISO-8859-1"),"gb2312");

//输出结果

Systemoutprintln(id + "\t" + name);

}

rsclose();

conclose();

} catch(ClassNotFoundException e) {

//数据库驱动类异常处理

Systemoutprintln("Sorry,can`t find the Driver!");

eprintStackTrace();

} catch(SQLException e) {

//数据库连接失败异常处理

eprintStackTrace();

}catch (Exception e) {

// TODO: handle exception

eprintStackTrace();

}finally{

Systemoutprintln("数据库数据成功获取！！");

}

}

}

在上面while代码段后面添加以下代码段：

String name = null;

String id = null;

while(rsnext()){

//获取stuname这列数据

name = rsgetString("stuname");

//获取stuid这列数据

id = rsgetString("stuid");

//首先使用ISO-8859-1字符集将name解码为字节序列并将结果存储新的字节数组中。

//然后使用GB2312字符集解码指定的字节数组。

name = new String(namegetBytes("ISO-8859-1"),"gb2312");

//输出结果

Systemoutprintln(id + "\t" + name);

}

PreparedStatement psql;

ResultSet res;

//预处理添加数据，其中有两个参数--“？”

psql = conprepareStatement("insert into student values(,)");

psqlsetInt(1, 8); //设置参数1，创建id为5的数据

psqlsetString(2, "xiaogang"); //设置参数2，name 为小明

psqlexecuteUpdate(); //执行更新

//预处理更新（修改）数据

psql = conprepareStatement("update student set stuname = where stuid = ");

psqlsetString(1,"xiaowang"); //设置参数1，将name改为王五

psqlsetInt(2,10); //设置参数2，将id为2的数据做修改

psqlexecuteUpdate();

//预处理删除数据

psql = conprepareStatement("delete from student where stuid = ");

psqlsetInt(1, 5);

psqlexecuteUpdate();

//查询修改数据后student表中的数据

psql = conprepareStatement("selectfrom student");

res = psqlexecuteQuery(); //执行预处理sql语句

Systemoutprintln("执行增加、修改、删除后的数据");

while(resnext()){

name = resgetString("stuname");

id = resgetString("stuid");

name = new String(namegetBytes("ISO-8859-1"),"gb2312");

Systemoutprintln(id + "\t" + name);

}

resclose();

psqlclose();

这是jsp中sql2005的连接代码，放到页面或者javabean中都可以使用

import javasqlConnection;

import javasqlDriverManager;

import javasql;

public class Dbconn {

public Connection getConnection()

{

String driverName = "commicrosoftsqlserverjdbcSQLServerDriver";

String dbURL = "jdbc:sqlserver://localhost:1433;DataBaseName=xmsz";

String userName = "admin";

String userPwd ="123";

Connection dbConn = null;

try {

ClassforName(driverName);

dbConn = DriverManagergetConnection(dbURL, userName, userPwd);

Systemoutprintln("Connection Successful!");

}

catch (Exception e) {

// eprintStackTrace();

Systemoutprintln(egetMessage());

}

return dbConn;

}

}

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