ASPNETMVC开发源码分析(6)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace MyNote.DAL
{
public class DbHelperSQL
{
private string _connectionString;
public string ConnectionString
{
get { return _connectionString; }
set { _connectionString = value; }
}
public DbHelperSQL(string connectionString)
{
this._connectionString = connectionString;
}
#region 公用方法
///

/// 判断是否存在某表的某个字段
///

/// 表名称
/// 列名称
/// 是否存在
public 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;
}
///

/// 取最大ID.
///

/// 列明。
///
///
public 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 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());
}
if (cmdresult == 0)
{
return false;
}
else
{
return true;
}
}
///

/// 表是否存在
///

///
///
public bool TabExists(string TableName)
{
string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
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;
}
}
///

/// 执行带参数的查询语句，返回是否有查询结果。
///

/// 查询命令。
/// 参数。
/// 是否存在查询结果。
public 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
///

/// 执行SQL语句，返回影响的记录数
///

/// SQL语句
/// 影响的记录数
public int ExecuteSql(string SQLString)
{
//string connectionString = PubConstant.GetSessionConnectString();
//log4netSql.writeSqlError(SQLString, _connectionString);
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();
//、log4netSql.writeSqlError(e.Message, _connectionString);
throw e;
}
}
}
}
public int ExecuteInsert(string SQLString)
{
//string connectionString = PubConstant.GetSessionConnectString();
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 int ExecuteInsertByTime(string SQLString, int Times)
{
using (SqlConnection connection = new SqlConnection(_connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
https://www.360docs.net/doc/c816229166.html,mandTimeout = Times;
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
///

/// 执行多条SQL语句，实现数据库事务。
///

/// 多条SQL语句
public int ExecuteSqlTran(List 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)
{
https://www.360docs.net/doc/c816229166.html,mandText = strsql;
count += cmd.ExecuteNonQuery();
}
}
https://www.360docs.net/doc/c816229166.html,mit();
return count;
}
catch (Exception e)
{
tx.Rollback();
return 0;
}
}
}
///

/// 事务执行SQL语句并
///

/// SQL命令。
/// 返回状态。
/// 返回成功与否。
public string ExecuteSqlTran(string strSql, ref Boolean result)
{
//string connectionString = PubConstant.GetSessionConnectString();
using (SqlConnection conn = new SqlConnection(_connectionString))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
SqlTransaction tx = conn.BeginTra

nsaction();
cmd.Transaction = tx;
try
{
int count = 0;
https://www.360docs.net/doc/c816229166.html,mandText = strSql;
count += cmd.ExecuteNonQuery();
https://www.360docs.net/doc/c816229166.html,mit();
result = true;
return count.ToString();
}
catch (Exception e1)
{
tx.Rollback();
result = false;
return e1.Message;
}
}
}
///

/// 执行带一个存储过程参数的的SQL语句。
///

/// SQL语句
/// 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
/// 影响的记录数
public int ExecuteSql(string SQLString, string content)
{
//string connectionString = PubConstant.GetSessionConnectString();
using (SqlConnection connection = new SqlConnection(_connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", "txt");
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();
}
}
}
///

/// 执行带一个存储过程参数的的SQL语句。
///

/// SQL语句
/// 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
/// 影响的记录数
public object ExecuteSqlGet(string SQLString, string content)
{
//string connectionString = PubConstant.GetSessionConnectString();
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();
}
}
}
///

/// 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)
///

/// SQL语句
/// 图像字节,数据库的字段类型为image的情况
/// 影响的记录数
public 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();
}
}
}
///

/// 执行一条计算查询结果语句，返回查询结果（object）。
///

/// 计算查询结果语句
/// 查询结果（object）
public object GetObject(string SQLString)
{
//string connectionString = PubConstant.GetSessionConnectString();
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 object GetObject(string SQLString, int Times)
{
using (SqlConnection connection = new SqlConnection(_connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
https://www.360docs.net/doc/c816229166.html,mandTimeout = 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;
}
}
}
}
///

/// 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 )
///

/// 查询语句
/// SqlDataReader
public 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;
}
}
///

/// 执行查询语句，返回DataSet
///

/// 查询语句
/// DataSet
public 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(SQLString + ex.Message);
}
return ds;
}

}
public 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);
https://www.360docs.net/doc/c816229166.html,mandTimeout = Times;
command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
public DataSet Query(string connectString, string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectString))
{
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(SQLString + ex.Message);
}
return ds;
}
}
#endregion
#region 执行带参数的SQL语句
///

/// 执行SQL语句，返回影响的记录数
///

/// SQL语句
/// 影响的记录数
public 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;
}
}
}
}
public string ExcAppSQL(string strSQL, SqlParameter[] paras, ref string result)
{
string err_msg = string.Empty;
try
{
using (SqlConnection conn = new SqlConnection(_connectionString))
{
SqlCommand cmd = new SqlCommand(strSQL, conn);
https://www.360docs.net/doc/c816229166.html,mandType = CommandType.Text;
if (paras != null)
{
cmd.Parameters.AddRange(paras);
}

conn.Open();
SqlDataReader sdr = cmd.ExecuteReader();
if (sdr.HasRows)
{
sdr.Read();
if (sdr.FieldCount > 1)
{
string err_code = sdr[0].ToString();
if (err_code != "0")
{
err_msg = sdr[1].ToString();
}
}
if (sdr.FieldCount > 3)
{
result = sdr[3].ToString();
}
}
conn.Close();
}
}
catch (Exception ex)
{
err_msg = ex.Message;
}
return err_msg;
}
///

/// 执行多条SQL语句，实现数据库事务。
///

/// SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）
public 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();
}
https://www.360docs.net/doc/c816229166.html,mit();
}
catch (Exception e)
{
trans.Rollback();
throw;
}
}
}
}
///

/// 执行一条计算查询结果语句，返回查询结果（object）。
///

/// 计算查询结果语句
/// 查询结果（object）
public object GetSingle(string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(_connectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);

object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
}
}
///

/// 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 )
///

/// 查询语句
/// SqlDataReader
public SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)
{
SqlConnection connection = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand();
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
///

/// 执行查询语句，返回DataSet
///

/// 查询语句
/// DataSet
public DataSet Query(string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(_connectionString))
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
private void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
https://www.360docs.net/doc/c816229166.html,mandText = cmdText;
if (trans != null)
cmd.Transaction

= trans;
https://www.360docs.net/doc/c816229166.html,mandType = CommandType.Text;//cmdType;
if (cmdParms != null)
{
foreach (SqlParameter parameter in cmdParms)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
}
#endregion
#region 存储过程操作
///

/// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
///

/// 存储过程名
/// 存储过程参数
/// SqlDataReader
public SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
{
//string connectionString = PubConstant.GetSessionConnectString();
SqlConnection connection = new SqlConnection(_connectionString);
SqlDataReader returnReader;
connection.Open();
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
https://www.360docs.net/doc/c816229166.html,mandType = CommandType.StoredProcedure;
returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
return returnReader;
}
///

/// 执行存储过程
///

/// 存储过程名
/// 存储过程参数
/// DataSet结果中的表名
/// DataSet
public DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
{
using (SqlConnection connection = new SqlConnection(_connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
public DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
{
//string connectionString = PubConstant.GetSessionConnectString();
using (SqlConnection connection = new SqlConnection(_connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();

sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
https://www.360docs.net/doc/c816229166.html,mandTimeout = Times;
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
///

/// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
///

/// 数据库连接
/// 存储过程名
/// 存储过程参数
/// SqlCommand
private SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
{
SqlCommand command = new SqlCommand(storedProcName, connection);
https://www.360docs.net/doc/c816229166.html,mandType = CommandType.StoredProcedure;
foreach (SqlParameter parameter in parameters)
{
if (parameter != null)
{
// 检查未分配值的输出参数,将其分配以DBNull.Value.
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
command.Parameters.Add(parameter);
}
}
return command;
}
///

/// 执行存储过程，返回影响的行数
///

/// 存储过程名
/// 存储过程参数
/// 影响的行数
///
public int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
{
//string connectionString = PubConstant.GetSessionConnectString();
using (SqlConnection connection = new SqlConnection(_connectionString))
{
int result;
connection.Open();
SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
rowsAffected = command.ExecuteNonQuery();
result = (int)command.Parameters["ReturnValue"].Value;
//Connection.Close();
return result;
}
}
///

/// 创建 SqlCommand 对象实例(用来返回一个整数值)
///

/// 存储过程名
/// 存储过程参数
/// SqlCommand 对象实例
private SqlCommand BuildIntCommand(SqlConnection connection, str

ing storedProcName, IDataParameter[] parameters)
{
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.Parameters.Add(new SqlParameter("ReturnValue",
SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));
return command;
}
#endregion
#region 执行查询，返回DataTable对象-----------------------
public DataTable GetTable(string strSQL)
{
return GetTable(strSQL, null);
}
public DataTable GetTable(string strSQL, SqlParameter[] pas)
{
return GetTable(strSQL, pas, CommandType.Text);
}
///

/// 执行查询，返回DataTable对象
///

/// sql语句
/// 参数数组
/// Command类型
/// DataTable对象
public DataTable GetTable(string strSQL, SqlParameter[] pas, CommandType cmdtype)
{
//string connectionString = PubConstant.GetSessionConnectString();
//log4netSql.writeSqlLog_SqlParameter(strSQL, _connectionString, pas);
DataSet ds = new DataSet();
using (SqlConnection conn = new SqlConnection(_connectionString))
{
SqlDataAdapter da = new SqlDataAdapter(strSQL, conn);
https://www.360docs.net/doc/c816229166.html,mandType = cmdtype;
if (pas != null)
{
da.SelectCommand.Parameters.AddRange(pas);
}
da.Fill(ds);
}
if (ds.Tables.Count == 0)
{
return new DataTable();
}
else
{
return ds.Tables[0];
}
}
#endregion
}
}