WINFORM权限系统开发系列教程
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类库代码
DbHelper.cs
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Xwy.WindowsFormsApp.DAL.Helpers
{
/// <summary>
/// 数据库帮组类(工具类) 静态类操作起来更快
/// </summary>
public static class DBHelper
{
/// <summary>
/// 连接字符串
/// </summary>
private static string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
/// <summary>
/// 增、删、改的通用方法
/// 执行sql语句或者存储过程，返回受影响的行数
/// sql注入
/// </summary>
/// <param name="sql">sql语句或者存储过程名</param>
/// <param name="cmdType">执行的脚步类型 1:sql语句 2:存储过程</param>
/// <param name="parameters">参数列表</param>
/// <returns></returns>
public static int ExecuteNonQuery(string sql,int cmdType,params SqlParameter[] parameters)
{
int result = 0;//返回结果
using(SqlConnection conn=new SqlConnection(connStr))
{
//执行脚本的对象cmd
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
result = cmd.ExecuteNonQuery();//执行T-SQL并返回受影响的行数
cmd.Parameters.Clear();
}
//using原理：类似于try finally
return result;
}
/// <summary>
/// 执行sql返回第一行第一列的值
/// sql注入
/// </summary>
/// <param name="sql">sql语句或者存储过程名</param>
/// <param name="cmdType">执行的脚步类型 1:sql语句 2:存储过程</param>
/// <param name="parameters">参数列表</param>
/// <returns></returns>
public static object ExecuteScalar(string sql, int cmdType, params SqlParameter[] parameters)
{
//params 只能写在一维数组前，且只能标识参数列表中的最后一个参数
//select @@Indentity 返回上一次插入记录自动产生的ID
object result = null;//返回结果
using (SqlConnection conn = new SqlConnection(connStr))
{
//执行脚本的对象cmd
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
result = cmd.ExecuteScalar();//执行T-SQL并返回第一行第一列的值
cmd.Parameters.Clear();
if (result == null || result == DBNull.Value)
{
return null;
}
else
{
return result;
}
}
//using原理：类似于try finally
//return result;
}
/// <summary>
/// 执行sql查询，返回SqlDataReader对象
/// </summary>
/// <param name="sql"></param>
/// <param name="cmdType"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public static SqlDataReader ExecuteReader(string sql, int cmdType, params SqlParameter[] parameters)
{
//params 只能写在一维数组前，且只能标识参数列表中的最后一个参数
SqlConnection conn = new SqlConnection(connStr);
//执行脚本的对象cmd
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
SqlDataReader reader;
try
{
reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return reader;
}
catch (Exception ex) {
conn.Close();
throw new Exception("创建reader对象发生异常",ex);
}
}
/// <summary>
/// 执行查询，查询结果填充到DataTable 只针对查询一个表的情况
/// </summary>
/// <param name="sql"></param>
/// <param name="cmdType"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public static DataTable GetDataTable(string sql, int cmdType, params SqlParameter[] parameters)
{
DataTable dt = null;
using (SqlConnection conn=new SqlConnection(connStr))
{
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
SqlDataAdapter da = new SqlDataAdapter(cmd);
dt = new DataTable();
da.Fill(dt);
}
return dt;
}
/// <summary>
/// 执行查询，数据填充到DataSet
/// </summary>
/// <param name="sql"></param>
/// <param name="cmdType"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public static DataSet GetDataSet(string sql, int cmdType, params SqlParameter[] parameters)
{
DataSet ds = null;
using (SqlConnection conn = new SqlConnection(connStr))
{
SqlCommand cmd = BuilderCommand(conn, sql, cmdType, null, parameters);
//数据适配器
//conn 自动打开 断开式连接
SqlDataAdapter da = new SqlDataAdapter(cmd);
ds = new DataSet();
da.Fill(ds);
//自动关闭conn
}
return ds;
}
/// <summary>
/// 事务 执行批量sql
/// </summary>
/// <param name="listSql"></param>
/// <returns></returns>
public static bool ExecuteTrans(List<string> listSql)
{
using (SqlConnection conn=new SqlConnection(connStr))
{
conn.Open();
SqlTransaction trans = conn.BeginTransaction();
SqlCommand cmd = BuilderCommand(conn, "", 1, trans);
try
{
int count = 0;
for (int i = 0; i < listSql.Count; i++)
{
cmd.CommandText = listSql[i];
cmd.CommandType = CommandType.Text;
count += cmd.ExecuteNonQuery();
}
trans.Commit();
return true;
}
catch (Exception ex)
{
trans.Rollback();
throw new Exception("执行事务出现异常",ex);
}
}
}
/// <summary>
/// 事务 批量执行 CommandInfo 包括sql,脚本类型，参数列表
/// </summary>
/// <param name="comList"></param>
/// <returns></returns>
public static bool ExecuteTrans(List<CommandInfo> comList)
{
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
SqlTransaction trans = conn.BeginTransaction();
SqlCommand cmd = BuilderCommand(conn, "", 1, trans);
try
{
int count = 0;
for (int i = 0; i < comList.Count; i++)
{
cmd.CommandText = comList[i].CommandText;
if (comList[i].IsProc)
{
cmd.CommandType = CommandType.StoredProcedure;
}
else
{
cmd.CommandType = CommandType.Text;
}
if (comList[i].Paras.Length > 0)
{
cmd.Parameters.Clear();
foreach (var p in comList[i].Paras)
{
cmd.Parameters.Add(p);
}
}
count += cmd.ExecuteNonQuery();
}
trans.Commit();
return true;
}
catch (Exception ex)
{
trans.Rollback();
throw new Exception("执行事务出现异常", ex);
}
}
}
public static T ExecuteTrans<T>(Func<IDbCommand,T> action)
{
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
IDbTransaction trans = conn.BeginTransaction();
IDbCommand cmd = conn.CreateCommand();
cmd.Transaction = trans;
return action(cmd);
}
}
private static SqlCommand BuilderCommand(SqlConnection conn, string sql, int cmdType, SqlTransaction trans, SqlParameter[] paras)
{
if (conn == null) throw new ArgumentNullException("连接对象不能为空!");
SqlCommand cmd = new SqlCommand(sql,conn);
if (cmdType == 2)
{
cmd.CommandType = CommandType.StoredProcedure;
}
if (conn.State == ConnectionState.Closed)
conn.Open();
if (trans != null)
cmd.Transaction = trans;
if (paras != null && paras.Length > 0)
{
cmd.Parameters.Clear();
cmd.Parameters.AddRange(paras);
}
return cmd;
}
private static SqlCommand BuilderCommand(SqlConnection conn, string sql, int cmdType, SqlTransaction trans)
{
return BuilderCommand(conn,sql,cmdType,trans,null);
}
}
}
CommandInfo.cs
using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Xwy.WindowsFormsApp.DAL.Helpers
{
public class CommandInfo
{
public string CommandText;//sql或存储过程名
public DbParameter[] Paras; //参数列表
public bool IsProc; //是否存储过程
public CommandInfo()
{
}
public CommandInfo(string comText,bool isProc)
{
this.CommandText = comText;
this.IsProc = isProc;
}
public CommandInfo(string comText, bool isProc,DbParameter[] para)
{
this.CommandText = comText;
this.IsProc = isProc;
this.Paras = para;
}
}
}
StringHelper.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Xwy.WindowsFormsApp.Common
{
public static class StringHelper
{
/// <summary>
/// 将数字字符串转为decimal
/// </summary>
/// <param name="strValue"></param>
/// <returns></returns>
public static decimal GetDecimal(this string strValue)
{
decimal reInt = 0;
decimal.TryParse(strValue, out reInt);
return reInt;
}
/// <summary>
/// 将数字字符串转为int
/// </summary>
/// <param name="strValue"></param>
/// <returns></returns>
public static int GetInt(this string strValue)
{
int reInt = 0;
int.TryParse(strValue, out reInt);
return reInt;
}
/// <summary>
/// 将字符串按照字符speater分割为List<string>
/// </summary>
/// <param name="str"></param>
/// <param name="speater"></param>
/// <param name="toLower"></param>
/// <returns></returns>
public static List<string> GetStrList(this string str, char speater, bool toLower)
{
List<string> list = new List<string>();
string[] ss = str.Split(speater);
foreach (string s in ss)
{
if (!string.IsNullOrEmpty(s) && s != speater.ToString())
{
string strVal = s;
if (toLower)
{
strVal = s.ToLower();
}
list.Add(strVal);
}
}
return list;
}
/// <summary>
/// 将字符串按照,分割为数组
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string[] GetStrArray(this string str)
{
return str.Split(new char[] { ‘,‘});
}
}
}
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