原文地址：http://www.oschina.net/code/snippet_12_1317
using System;using System.Collections.Generic;using System.Text;using System.Data;using System.Data.SqlClient;using System.Configuration;namespace ADODoNETDemo{ /// <summary> /// 针对SQL Server数据库操作的通用类 /// 作者：周公 /// 日期：2009-01-08 /// Version:1.0 /// </summary> public class SqlDbHelper { private string connectionString; /// <summary> /// 设置数据库连接字符串 /// </summary> public string ConnectionString { set { connectionString = value; } } /// <summary> /// 构造函数 /// </summary> public SqlDbHelper() : this(ConfigurationManager.ConnectionStrings["Conn"].ConnectionString) { } /// <summary> /// 构造函数 /// </summary> /// <param name="connectionString">数据库连接字符串</param> public SqlDbHelper(string connectionString) { this.connectionString = connectionString; } /// <summary> /// 执行一个查询，并返回结果集 /// </summary> /// <param name="sql">要执行的查询SQL文本命令</param> /// <returns>返回查询结果集</returns> public DataTable ExecuteDataTable(string sql) { return ExecuteDataTable(sql, CommandType.Text, null); } /// <summary> /// 执行一个查询,并返回查询结果 /// </summary> /// <param name="sql">要执行的SQL语句</param> /// <param name="commandType">要执行的查询语句的类型，如存储过程或者SQL文本命令</param> /// <returns>返回查询结果集</returns> public DataTable ExecuteDataTable(string sql, CommandType commandType) { return ExecuteDataTable(sql, commandType, null); } /// <summary> /// 执行一个查询,并返回查询结果 /// </summary> /// <param name="sql">要执行的SQL语句</param> /// <param name="commandType">要执行的查询语句的类型，如存储过程或者SQL文本命令</param> /// <param name="parameters">Transact-SQL 语句或存储过程的参数数组</param> /// <returns></returns> public DataTable ExecuteDataTable(string sql, CommandType commandType, SqlParameter[] parameters) { DataTable data = new DataTable();//实例化DataTable，用于装载查询结果集 using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand command = new SqlCommand(sql, connection)) { command.CommandType = commandType;//设置command的CommandType为指定的CommandType //如果同时传入了参数，则添加这些参数 if (parameters != null) { foreach (SqlParameter parameter in parameters) { command.Parameters.Add(parameter); } } //通过包含查询SQL的SqlCommand实例来实例化SqlDataAdapter SqlDataAdapter adapter = new SqlDataAdapter(command); adapter.Fill(data);//填充DataTable } } return data; } /// <summary> /// /// </summary> /// <param name="sql">要执行的查询SQL文本命令</param> /// <returns></returns> public SqlDataReader ExecuteReader(string sql) { return ExecuteReader(sql, CommandType.Text, null); } /// <summary> /// /// </summary> /// <param name="sql">要执行的SQL语句</param> /// <param name="commandType">要执行的查询语句的类型，如存储过程或者SQL文本命令</param> /// <returns></returns> public SqlDataReader ExecuteReader(string sql, CommandType commandType) { return ExecuteReader(sql, commandType, null); } /// <summary> /// /// </summary> /// <param name="sql">要执行的SQL语句</param> /// <param name="commandType">要执行的查询语句的类型，如存储过程或者SQL文本命令</param> /// <param name="parameters">Transact-SQL 语句或存储过程的参数数组</param> /// <returns></returns> public SqlDataReader ExecuteReader(string sql, CommandType commandType, SqlParameter[] parameters) { SqlConnection connection = new SqlConnection(connectionString); SqlCommand command = new SqlCommand(sql, connection); //如果同时传入了参数，则添加这些参数 if (parameters != null) { foreach (SqlParameter parameter in parameters) { command.Parameters.Add(parameter); } } connection.Open(); //CommandBehavior.CloseConnection参数指示关闭Reader对象时关闭与其关联的Connection对象 return command.ExecuteReader(CommandBehavior.CloseConnection); } /// <summary> /// /// </summary> /// <param name="sql">要执行的查询SQL文本命令</param> /// <returns></returns> public Object ExecuteScalar(string sql) { return ExecuteScalar(sql, CommandType.Text, null); } /// <summary> /// /// </summary> /// <param name="sql">要执行的SQL语句</param> /// <param name="commandType">要执行的查询语句的类型，如存储过程或者SQL文本命令</param> /// <returns></returns> public Object ExecuteScalar(string sql, CommandType commandType) { return ExecuteScalar(sql, commandType, null); } /// <summary> /// /// </summary> /// <param name="sql">要执行的SQL语句</param> /// <param name="commandType">要执行的查询语句的类型，如存储过程或者SQL文本命令</param> /// <param name="parameters">Transact-SQL 语句或存储过程的参数数组</param> /// <returns></returns> public Object ExecuteScalar(string sql, CommandType commandType, SqlParameter[] parameters) { object result = null; using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand command = new SqlCommand(sql, connection)) { command.CommandType = commandType;//设置command的CommandType为指定的CommandType //如果同时传入了参数，则添加这些参数 if (parameters != null) { foreach (SqlParameter parameter in parameters) { command.Parameters.Add(parameter); } } connection.Open();//打开数据库连接 result = command.ExecuteScalar(); } } return result;//返回查询结果的第一行第一列，忽略其它行和列 } /// <summary> /// 对数据库执行增删改操作 /// </summary> /// <param name="sql">要执行的查询SQL文本命令</param> /// <returns></returns> public int ExecuteNonQuery(string sql) { return ExecuteNonQuery(sql, CommandType.Text, null); } /// <summary> /// 对数据库执行增删改操作 /// </summary> /// <param name="sql">要执行的SQL语句</param> /// <param name="commandType">要执行的查询语句的类型，如存储过程或者SQL文本命令</param> /// <returns></returns> public int ExecuteNonQuery(string sql, CommandType commandType) { return ExecuteNonQuery(sql, commandType, null); } /// <summary> /// 对数据库执行增删改操作 /// </summary> /// <param name="sql">要执行的SQL语句</param> /// <param name="commandType">要执行的查询语句的类型，如存储过程或者SQL文本命令</param> /// <param name="parameters">Transact-SQL 语句或存储过程的参数数组</param> /// <returns></returns> public int ExecuteNonQuery(string sql, CommandType commandType, SqlParameter[] parameters) { int count = 0; using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand command = new SqlCommand(sql, connection)) { command.CommandType = commandType;//设置command的CommandType为指定的CommandType //如果同时传入了参数，则添加这些参数 if (parameters != null) { foreach (SqlParameter parameter in parameters) { command.Parameters.Add(parameter); } } connection.Open();//打开数据库连接 count = command.ExecuteNonQuery(); } } return count;//返回执行增删改操作之后，数据库中受影响的行数 } /// <summary> /// 返回当前连接的数据库中所有由用户创建的数据库 /// </summary> /// <returns></returns> public DataTable GetTables() { DataTable data = null; using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open();//打开数据库连接 data = connection.GetSchema("Tables"); } return data; } }}
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data.SqlClient;using System.Data;namespace ADODoNETDemo{ /// <summary> /// 用ADO.NET实现CRUD功能 /// </summary> public class ADODotNetCRUD { /// <summary> /// 统计用户总数 /// </summary> /// <returns></returns> public int Count() { string sql = "select count(1) from UserInfo"; SqlDbHelper db = new SqlDbHelper(); return int.Parse(db.ExecuteScalar(sql).ToString()); } /// <summary> /// 创建用户 /// </summary> /// <param name="info">用户实体</param> /// <returns></returns> public bool Create(UserInfo info) { string sql = "insert UserInfo(UserName,RealName,Age,Sex,Mobile,Email,Phone)values(@UserName,@RealName,@Age,@Sex,@Mobile,@Email,@Phone)"; SqlParameter[] paramters = new SqlParameter[]{ new SqlParameter("@UserName",info.UserName), new SqlParameter("@RealName",info.RealName), new SqlParameter("@Age",info.Age), new SqlParameter("@Sex",info.Sex), new SqlParameter("@Mobile",info.Mobile), new SqlParameter("@Email",info.Email), new SqlParameter("@Phone",info.Phone), }; SqlDbHelper db = new SqlDbHelper(); return db.ExecuteNonQuery(sql, CommandType.Text, paramters) > 0; } /// <summary> /// 读取用户信息 /// </summary> /// <param name="userId">用户编号</param> /// <returns></returns> public UserInfo Read(int userId) { string sql = "select * from UserInfo Where UserId="+userId; SqlDbHelper db = new SqlDbHelper(); DataTable data = db.ExecuteDataTable(sql); if (data.Rows.Count > 0) { DataRow row = data.Rows[0]; UserInfo info = new UserInfo() { UserId=int.Parse(row["UserId"].ToString()), UserName=row["UserName"].ToString(), Age=byte.Parse(row["Age"].ToString()), Email=row["Email"].ToString(), Mobile=row["Mobile"].ToString(), Phone=row["Phone"].ToString(), RealName=row["RealName"].ToString(), Sex=bool.Parse(row["Sex"].ToString()) }; return info; } else { return null; } } /// <summary> /// 更新用户信息 /// </summary> /// <param name="info">用户实体</param> /// <returns></returns> public bool Update(UserInfo info) { string sql = "update UserInfo set UserName=@UserName,RealName=@RealName,Age=@Age,Sex=@Sex,Mobile=@Mobile,Email=@Email,Phone=@Phone where UserID=@UserID"; SqlParameter[] paramters = new SqlParameter[]{ new SqlParameter("@UserName",info.UserName), new SqlParameter("@RealName",info.RealName), new SqlParameter("@Age",info.Age), new SqlParameter("@Sex",info.Sex), new SqlParameter("@Mobile",info.Mobile), new SqlParameter("@Email",info.Email), new SqlParameter("@Phone",info.Phone), new SqlParameter("@UserID",info.UserId), }; SqlDbHelper db = new SqlDbHelper(); return db.ExecuteNonQuery(sql, CommandType.Text, paramters) > 0; } /// <summary> /// 删除用户 /// </summary> /// <param name="userId">用户编号</param> /// <returns></returns> public bool Delete(int userId) { string sql = "delete from UserInfo where UserId=" + userId; SqlDbHelper db = new SqlDbHelper(); return db.ExecuteNonQuery(sql) > 0; } /// <summary> /// 获取用户表中编号最大的用户 /// </summary> /// <returns></returns> public int GetMaxUserId() { string sql = "select max(userId) from UserInfo"; SqlDbHelper db = new SqlDbHelper(); return int.Parse(db.ExecuteScalar(sql).ToString()); } }}
using System;using System.Collections.Generic;using System.Linq;using System.Text;using ADODoNETDemo;using NUnit.Framework;namespace NUnitTest{ [TestFixture] class ADODotNetTest { private ADODotNetCRUD instance = null; [SetUp] public void Initialize() { instance = new ADODotNetCRUD(); } [Test] /// <summary> /// 统计用户总数 /// </summary> /// <returns></returns> public void Count() { Assert.Greater(instance.Count(), 0); } [Test] /// <summary> /// 创建用户 /// </summary> /// <param name="info">用户实体</param> /// <returns></returns> public void Create() { UserInfo info = new UserInfo() { Age = 12, Email = "zzz@ccav.com", Mobile = "13812345678", Phone = "01012345678", RealName = "测试" + DateTime.Now.Millisecond.ToString(), Sex = true, UserName = "zhoufoxcn" + DateTime.Now.Millisecond.ToString() }; instance.Create(info); } [Test] /// <summary> /// 读取用户信息 /// </summary> /// <param name="userId">用户编号</param> /// <returns></returns> public void Read() { UserInfo info = instance.Read(1); Assert.NotNull(info); } [Test] /// <summary> /// 更新用户信息 /// </summary> /// <param name="info">用户实体</param> /// <returns></returns> public void Update() { UserInfo info = instance.Read(1); info.RealName = "测试" + DateTime.Now.Millisecond.ToString(); instance.Update(info); } [Test] /// <summary> /// 删除用户 /// </summary> /// <param name="userId">用户编号</param> /// <returns></returns> public void DeleteByID() { int userId = instance.GetMaxUserId(); instance.Delete(userId); } }}
