DbHelperSQL—— 动软生成DbHelperSQL类
时间：2021-07-01 10:21:17
帮助过：2人阅读
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
namespace Register.DataAccess
{
/// <summary>
/// 数据访问抽象基础类
/// Copyright (C) Maticsoft
/// </summary>
public abstract class DbHelperSQL
{
//数据库连接字符串(web.config来配置)，多数据库可使用DbHelperSQLP来实现.
public static string connectionString = ConfigurationManager.ConnectionStrings[
"sqlservercon"].ConnectionString;
public DbHelperSQL()
{
}
#region 公用方法
/// <summary>
/// 判断是否存在某表的某个字段
/// </summary>
/// <param name="tableName">表名称</param>
/// <param name="columnName">列名称</param>
/// <returns>是否存在</returns>
public static bool ColumnExists(
string tableName,
string columnName)
{
string sql =
"select count(1) from syscolumns where [id]=object_id(‘" + tableName +
"‘) and [name]=‘" + columnName +
"‘";
object res =
GetSingle(sql);
if (res ==
null)
{
return false;
}
return Convert.ToInt32(res) >
0;
}
public static int GetMaxID(
string FieldName,
string TableName)
{
string strsql =
"select max(" + FieldName +
")+1 from " +
TableName;
object obj =
GetSingle(strsql);
if (obj ==
null)
{
return 1;
}
else
{
return int.Parse(obj.ToString());
}
}
public static bool Exists(
string strSql)
{
object obj =
GetSingle(strSql);
int cmdresult;
if ((Object.Equals(obj,
null)) ||
(Object.Equals(obj, System.DBNull.Value)))
{
cmdresult =
0;
}
else
{
cmdresult =
int.Parse(obj.ToString());
//也可能=0
}
if (cmdresult ==
0)
{
return false;
}
else
{
return true;
}
}
/// <summary>
/// 表是否存在
/// </summary>
/// <param name="TableName"></param>
/// <returns></returns>
public static bool TabExists(
string TableName)
{
string strsql =
"select count(*) from sysobjects where id = object_id(N‘[" + TableName +
"]‘) and OBJECTPROPERTY(id, N‘IsUserTable‘) = 1";
//string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N‘[dbo].[" + TableName + "]‘) AND type in (N‘U‘)";
object obj =
GetSingle(strsql);
int cmdresult;
if ((Object.Equals(obj,
null)) ||
(Object.Equals(obj, System.DBNull.Value)))
{
cmdresult =
0;
}
else
{
cmdresult =
int.Parse(obj.ToString());
}
if (cmdresult ==
0)
{
return false;
}
else
{
return true;
}
}
public static bool Exists(
string strSql,
params SqlParameter[] cmdParms)
{
object obj =
GetSingle(strSql, cmdParms);
int cmdresult;
if ((Object.Equals(obj,
null)) ||
(Object.Equals(obj, System.DBNull.Value)))
{
cmdresult =
0;
}
else
{
cmdresult =
int.Parse(obj.ToString());
}
if (cmdresult ==
0)
{
return false;
}
else
{
return true;
}
}
#endregion
#region 执行简单SQL语句
/// <summary>
/// 执行SQL语句，返回影响的记录数
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(
string SQLString)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
using (SqlCommand cmd =
new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows =
cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
public static int ExecuteSqlByTime(
string SQLString,
int Times)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
using (SqlCommand cmd =
new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout =
Times;
int rows =
cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">多条SQL语句</param>
public static int ExecuteSqlTran(List<String>
SQLStringList)
{
using (SqlConnection conn =
new SqlConnection(connectionString))
{
conn.Open();
SqlCommand cmd =
new SqlCommand();
cmd.Connection =
conn;
SqlTransaction tx =
conn.BeginTransaction();
cmd.Transaction =
tx;
try
{
int count =
0;
for (
int n =
0; n < SQLStringList.Count; n++
)
{
string strsql =
SQLStringList[n];
if (strsql.Trim().Length >
1)
{
cmd.CommandText =
strsql;
count +=
cmd.ExecuteNonQuery();
}
}
tx.Commit();
return count;
}
catch
{
tx.Rollback();
return 0;
}
}
}
/// <summary>
/// 执行带一个存储过程参数的的SQL语句。
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(
string SQLString,
string content)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
SqlCommand cmd =
new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter =
new System.Data.SqlClient.SqlParameter(
"@content", SqlDbType.NText);
myParameter.Value =
content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows =
cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 执行带一个存储过程参数的的SQL语句。
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
public static object ExecuteSqlGet(
string SQLString,
string content)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
SqlCommand cmd =
new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter =
new System.Data.SqlClient.SqlParameter(
"@content", SqlDbType.NText);
myParameter.Value =
content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
object obj =
cmd.ExecuteScalar();
if ((Object.Equals(obj,
null)) ||
(Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
/// </summary>
/// <param name="strSQL">SQL语句</param>
/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSqlInsertImg(
string strSQL,
byte[] fs)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
SqlCommand cmd =
new SqlCommand(strSQL, connection);
System.Data.SqlClient.SqlParameter myParameter =
new System.Data.SqlClient.SqlParameter(
"@fs", SqlDbType.Image);
myParameter.Value =
fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows =
cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（object）。
/// </summary>
/// <param name="SQLString">计算查询结果语句</param>
/// <returns>查询结果（object）</returns>
public static object GetSingle(
string SQLString)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
using (SqlCommand cmd =
new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
object obj =
cmd.ExecuteScalar();
if ((Object.Equals(obj,
null)) ||
(Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
public static object GetSingle(
string SQLString,
int Times)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
using (SqlCommand cmd =
new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout =
Times;
object obj =
cmd.ExecuteScalar();
if ((Object.Equals(obj,
null)) ||
(Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// </summary>
/// <param name="strSQL">查询语句</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader ExecuteReader(
string strSQL)
{
SqlConnection connection =
new SqlConnection(connectionString);
SqlCommand cmd =
new SqlCommand(strSQL, connection);
try
{
connection.Open();
SqlDataReader myReader =
cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// <param name="SQLString">查询语句</param>
/// <returns>DataSet</returns>
public static DataSet Query(
string SQLString)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
DataSet ds =
new DataSet();
try
{
connection.Open();
SqlDataAdapter command =
new SqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
public static DataSet Query(
string SQLString,
int Times)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
DataSet ds =
new DataSet();
try
{
connection.Open();
SqlDataAdapter command =
new SqlDataAdapter(SQLString, connection);
command.SelectCommand.CommandTimeout =
Times;
command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion
#region 执行带参数的SQL语句
/// <summary>
/// 执行SQL语句，返回影响的记录数
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(
string SQLString,
params SqlParameter[] cmdParms)
{
using (SqlConnection connection =
new SqlConnection(connectionString))
{
using (SqlCommand cmd =
new SqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows =
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
}
}
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
public static void ExecuteSqlTran(Hashtable SQLStringList)
{
using (SqlConnection conn =
new SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans =
conn.BeginTransaction())
{
SqlCommand cmd =
new SqlCommand();
try
{
//循环
foreach (DictionaryEntry myDE
in SQLStringList)
{
string cmdText =
myDE.Key.ToString();
SqlParameter[] cmdParms =
(SqlParameter[])myDE.Value;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val =
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
public static
