一些数据库操作方法

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
namespace DLL.DB
{
public abstract class Hippo
{
//数据库连接字符串(web.config来配置),可以动态更改connectionString支持多数据库. public static string connectionString = "Server=10.00.00.00;Database=Test;uid=sa;pwd=sa;Enlist=true;Pooling=true;Max Pool Size=512;Min Pool Size=0;Connection Lifetime=300;packet size=2000";
#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 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;
}
return int.Parse(obj.ToString());
}
public static bool Exists(string strSql)
{
object obj = GetSingle(strSql);
int cmdresult;
if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
return cmdresult != 0;
}
///
/// 表是否存在
///

///
///
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 ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
return cmdresult != 0;
}
public static bool Exists(string strSql, params SqlParameter[] cmdParms)
{
object obj = GetSingle(strSql, cmdParms);
int cmdresult;
if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
return cmdresult != 0;
}
#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 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 (SqlException)
{
connection.Close();
return 0;
}
}
}
}
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 (SqlException)
{
connection.Close();
throw;
}
}
}
}
///
/// 执行多条SQL语句,实现数据库事务。
///

/// 多条SQL语句 public static int ExecuteSqlTran(List SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
SqlCommand cmd = new SqlCommand { 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;
}
}
}
///
/// 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 static int ExecuteSql(string SQLString, string content)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, connection);
SqlParameter myParameter = new SqlParameter("@content", SqlDbType.NText) { Value = content };
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
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 static object ExecuteSqlGet(string SQLString, string content)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, connection);
SqlParameter myParameter = new SqlParameter("@content", SqlDbType.NText) { Value = content };
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Equals(obj, null)) || (Equals(obj, DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
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 static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(strSQL, connection);
SqlParameter myParameter = new SqlParameter("@fs", SqlDbType.Image) { Value = fs };
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
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 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();
return (Equals(obj, null)) || (Equals(obj, DBNull.Value)) ? null : obj;
}
catch (SqlException)
{
connection.Close();
throw;
}
}
}
}
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();
return (Equals(obj, null)) || (Equals(obj, DBNull.Value)) ? null : obj;
}
catch (SqlException)
{
connection.Close();
throw;
}
}
}
}
///
/// 执行查询语句,返回DataSet
///

/// 查询语句
/// DataSet
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 (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) { SelectCommand = { CommandTimeout = Times } };
command.Fill(ds, "ds");
}
catch (SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
public static DataTable Querydt(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 (SqlException ex)
{
throw new Exception(ex.Message);
}
return ds.Tables[0];
}
}
#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 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
{
return 0;
}
}
}
}
///
/// 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 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);
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}
///
/// 执行多条SQL语句,实现数据库事务。
///

///
public static int ExecuteSqlTran(List cmdList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
SqlCommand cmd = new SqlCommand();
try
{
int count = 0;
//循环
foreach (CommandInfo myDE in cmdList)
{
string cmdText = myDE.CommandText;
SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
{
if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
{
trans.Rollback();
return 0;
}
object obj = cmd.ExecuteScalar();
bool isHave = false;
if (obj == null && obj == DBNull.Value)
{
isHave = false;
}
isHave = Convert.ToInt32(obj) > 0;
if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
{
trans.Rollback();
return 0;
}
if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
{
trans.Rollback();
return 0;
}
continue;
}
int val = cmd.ExecuteNonQuery();
count += val;
if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
{
trans.Rollback();
return 0;
}
cmd.Parameters.Clear();
}
trans.Commit();
return count;
}
catch
{
trans.Rollback();
throw;
}
}
}
}
///
/// 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 static void ExecuteSqlTranWithIndentity(List SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
SqlCommand cmd = new SqlCommand();
try
{
int indentity = 0;
//循环
foreach (CommandInfo myDE in SQLStringList)
{
string cmdText = myDE.CommandText;
SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
foreach (SqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.InputOutput)
{
q.Value = indentity;
}
}
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
cmd.ExecuteNonQuery();
foreach (SqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.Output)
{
indentity = Convert.ToInt32(q.Value);
}
}
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}
///
/// 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 static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
SqlCommand cmd = new SqlCommand();
try
{
int indentity = 0;
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
foreach (SqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.InputOutput)
{
q.Value = indentity;
}
}
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
cmd.ExecuteNonQuery();
foreach (SqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.Output)
{
indentity = Convert.ToInt32(q.Value);
}
}
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
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 static object GetSingle(string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return (Equals(obj, null)) || (Equals(obj, DBNull.Value)) ? null : obj;
}
}
}
///
/// 执行查询语句,返回DataSet
///

/// 查询语句
///
/// DataSet
public static 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 (SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, IEnumerable cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = 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 static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
{
SqlConnection connection = new SqlConnection(connectionString);
connection.Open();
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredProcedure;
SqlDataReader 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 static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter
{
SelectCommand = BuildQueryCommand(connection, storedProcName, parameters)
};
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
public static string RunProcedure(string storedProcName,string fileid)
{
using (SqlConnection connection=new SqlConnection(connectionString))
{
SqlCommand sqlCmd=new SqlCommand(storedProcName,connection);
sqlCmd.CommandType = CommandType.StoredProcedure;
SqlParameter sqlParme;
sqlParme = sqlCmd.Parameters.Add("@Refund_ID", SqlDbType.NVarChar,100);
sqlParme.Direction = ParameterDirection.Output;
connection.Open();
sqlCmd.ExecuteNonQuery();
fileid=sqlParme.Value.ToString();
connection.Close();
}
return fileid;
}
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter
{
SelectCommand = BuildQueryCommand(connection, storedProcName, parameters)
};
sqlDA.SelectCommand.CommandTimeout = 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 static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IEnumerable parameters)
{
SqlCommand command = new SqlCommand(storedProcName, connection) { CommandType = 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 ((par


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