1:配置
<connectionStrings>
<add name="ConnectionString1" connectionString="Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521)))(CONNECT_DATA=(SID=guandb)(SERVER=DEDICATED)));User ID=GUANUSER1;Password=k2763826;Unicode=True" providerName="System.Data.OleDb" />
<add name="ConnectionString2" connectionString="Data Source=localhost;Initial Catalog=guestbook;User ID=sa;password=123456;" providerName="System.Data.SqlClient" />
<add name="ConnectionString3" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Platform.mdb;Persist Security Info=False" providerName="System.Data.OleDb" />
<add name="ConnectionString" connectionString="Server=localhost;Database=VM;Uid=root;Pwd=bestel;charset=latin1;connection timeout=3600;charset=gb2312" providerName="MySql.Data.MySqlClient"/>
</connectionStrings>
2:写个公共的类
public class DbHelper
{
protected static string connectionString =
ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
public static DbProviderFactory provider=DbProviderFactories.GetFactory(
ConfigurationManager.ConnectionStrings["ConnectionString"].ProviderName);
public DbHelper()
{
}
public static DbParameter SetDbParameter(string parameterName,DbType t)
{
DbParameter myParameter = DbHelper.provider.CreateParameter();
myParameter.ParameterName = parameterName;
myParameter.DbType = t;
return myParameter;
}
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, params DbParameter[] 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;
}
}
#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 (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
cmd.Connection = connection;
cmd.CommandText = SQLString;
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (DbException E)
{
connection.Close();
connection.Dispose();
throw new Exception(E.Message);
}
}
}
}
/// <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 void ExecuteSqlTran(ArrayList SQLStringList)
{
using (DbConnection conn = provider.CreateConnection())
{
conn.ConnectionString = connectionString;
conn.Open();
using (DbCommand cmd = provider.CreateCommand())
{
cmd.Connection = conn;
using (DbTransaction tx = conn.BeginTransaction())
{
cmd.Transaction = tx;
try
{
for (int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList[n].ToString();
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch (DbException ex)
{
tx.Rollback();
conn.Close();
conn.Dispose();
throw ex;
}
}
}
}
}
/// <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 (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
cmd.Connection = connection;
cmd.CommandText = SQLString;
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) ||
(Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (DbException e)
{
connection.Close();
connection.Dispose();
throw new Exception(e.Message);
}
}
}
}
/// <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, params DbParameter[] cmdParms)
{
using (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
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.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
}
}
}
/// <summary>
/// 执行查询语句,返回SqlDataReader
/// </summary>
/// <param name="strSQL">查询语句</param>
/// <returns>SqlDataReader</returns>
public static DbDataReader ExecuteReader(string strSQL)
{
DbConnection connection = provider.CreateConnection();
connection.ConnectionString = connectionString;
DbCommand cmd = provider.CreateCommand();
cmd.Connection = connection;
cmd.CommandText = strSQL;
try
{
connection.Open();
DbDataReader myReader =
cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (System.Data.Common.DbException e)
{
connection.Close();
connection.Dispose();
throw new Exception(e.Message);
}
}
/// <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 (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
cmd.Connection = connection;
cmd.CommandText = SQLString;
try
{
DataSet ds = new DataSet();
DbDataAdapter adapter = provider.CreateDataAdapter();
adapter.SelectCommand = cmd;
adapter.Fill(ds, "ds");
return ds;
}
catch (DbException ex)
{
connection.Close();
connection.Dispose();
throw new Exception(ex.Message);
}
}
}
}
/// <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, DbParameter[] cmdParms)
{
using (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
cmd.Connection = connection;
cmd.CommandText = SQLString;
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
try
{
DataSet ds = new DataSet();
DbDataAdapter adapter = provider.CreateDataAdapter();
adapter.SelectCommand = cmd;
adapter.Fill(ds, "ds");
return ds;
}
catch (DbException ex)
{
connection.Close();
connection.Dispose();
throw new Exception(ex.Message);
}
}
}
}
#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, DbParameter[] cmdParms)
{
using (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
cmd.Connection = connection;
cmd.CommandText = SQLString;
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (DbException E)
{
connection.Close();
connection.Dispose();
throw new Exception(E.Message);
}
}
}
}
/// <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 (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
cmd.Connection = connection;
DbParameter[] cmdParms=new DbParameter[1];
DbParameter myParameter = provider.CreateParameter();
myParameter.ParameterName ="@content";
myParameter.DbType = DbType.String;
myParameter.Value = content;
cmdParms.SetValue(myParameter,0);
cmd.Parameters.Add(cmdParms);
cmd.CommandText = SQLString;
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (DbException E)
{
connection.Close();
connection.Dispose();
throw new Exception(E.Message);
}
}
}
}
/// <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 (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
cmd.Connection = connection;
cmd.CommandText = strSQL;
DbParameter myParameter = provider.CreateParameter();
myParameter.ParameterName = "@fs";
myParameter.DbType = DbType.Binary;
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.OleDb.OleDbException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
}
/// <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 (DbConnection conn = provider.CreateConnection())
{
conn.ConnectionString = connectionString;
conn.Open();
using (DbTransaction trans = conn.BeginTransaction())
{
using (DbCommand cmd = provider.CreateCommand())
{
try
{
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
DbParameter[] cmdParms = (DbParameter[])myDE.Value;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
trans.Commit();
}
catch (DbException ex)
{
trans.Rollback();
conn.Close();
conn.Dispose();
throw ex;
}
}
}
}
}
/// <summary>
/// 执行查询语句,返回SqlDataReader
/// </summary>
/// <param name="strSQL">查询语句</param>
/// <returns>SqlDataReader</returns>
public static DbDataReader ExecuteReader(string SQLString,
DbParameter[] cmdParms)
{
DbConnection connection = provider.CreateConnection();
connection.ConnectionString = connectionString;
DbCommand cmd = provider.CreateCommand();
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
DbDataReader myReader =
cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myReader;
}
catch (DbException e)
{
connection.Close();
connection.Dispose();
throw new Exception(e.Message);
}
}
/// <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 GetDataSet(string SQLString,
DbParameter[] cmdParms)
{
using (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
using (DbCommand cmd = provider.CreateCommand())
{
using (DbDataAdapter da = provider.CreateDataAdapter())
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
da.SelectCommand = cmd;
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
return ds;
}
catch (DbException ex)
{
connection.Close();
connection.Dispose();
throw new Exception(ex.Message);
}
}
}
}
}
private static void PrepareCommand(DbCommand cmd, DbConnection conn,
DbTransaction trans, string cmdText, DbParameter[] 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 (DbParameter parm in cmdParms)
{
cmd.Parameters.Add(parm);
}
}
}
/// <summary>
/// Access数据库分面查询语句
/// </summary>
/// <param name="strTableName">表名</param>
/// <param name="strPkFiled">主键</param>
/// <param name="strFiled">需要查询字段,多个字段用,隔开</param>
/// <param name="strWhere">条件语句,默认为 1=1</param>
/// <param name="strOrder">结果集排序</param>
/// <param name="iCurrentPageIndex">页码</param>
/// <param name="iPageSize">每页显示的条数</param>
/// <param name="iRecordCount">表的总行数</param>
/// <returns></returns>
public static DataTable SearchDataTable(string strTableName, string strPkFiled, string strFiled, string strWhere, string strOrder, int iCurrentPageIndex, int iPageSize, out int iRecordCount)
{
try
{
DataTable Dt = null;
string strSelectSql = "";
object obj = GetSingle("Select Count(1) From " + strTableName);
int iCount = Convert.ToInt32(obj);
strSelectSql = AccessPaging.Paging(iPageSize, iCurrentPageIndex, iCount, strTableName, strFiled, strPkFiled, true, strWhere);
if (!string.IsNullOrEmpty(strSelectSql))
Dt =Query(strSelectSql).Tables[0];
iRecordCount = iCount % iPageSize > 0 ? iCount / iPageSize : (iCount / iPageSize) - 1;
return Dt;
}
catch
{
iRecordCount = 0;
return null;
}
}
#endregion
#region 存储过程操作
/// <summary>
/// 执行存储过程;
/// </summary>
/// <param name="storeProcName">存储过程名</param>
/// <param name="parameters">所需要的参数</param>
/// <returns>返回受影响的行数</returns>
public static int RunProcedureExecuteSql(string storeProcName,
DbParameter[] parameters)
{
using (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
DbCommand cmd =
BuildQueryCommand(connection, storeProcName, parameters);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
connection.Close();
return rows;
}
}
/// <summary>
/// 执行存储过程,返回首行首列的值
/// </summary>
/// <param name="storeProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>返回首行首列的值</returns>
public static Object RunProcedureGetSingle(string storeProcName,
DbParameter[] parameters)
{
using (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
try
{
DbCommand cmd =
BuildQueryCommand(connection, storeProcName, parameters);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((Object.Equals(obj, null)) ||
(Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (DbException e)
{
connection.Close();
connection.Dispose();
throw new Exception(e.Message);
}
}
}
/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlDataReader</returns>
public static DbDataReader RunProcedureGetDataReader(string storedProcName,
DbParameter[] parameters)
{
DbConnection connection = provider.CreateConnection();
connection.ConnectionString = connectionString;
DbDataReader returnReader;
DbCommand cmd =
BuildQueryCommand(connection, storedProcName, parameters);
cmd.CommandType =
CommandType.StoredProcedure;
returnReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return returnReader;
}
/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>DataSet</returns>
public static DataSet RunProcedureGetDataSet(string storedProcName,
DbParameter[] parameters)
{
using (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
DataSet dataSet = new DataSet();
DbDataAdapter sqlDA = provider.CreateDataAdapter();
sqlDA.SelectCommand =
BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet);
sqlDA.SelectCommand.Parameters.Clear();
sqlDA.Dispose();
return dataSet;
}
}
/// <summary>
/// 执行多个存储过程,实现数据库事务。
/// </summary>
/// <param name="SQLStringList">存储过程的哈希表
///(value为存储过程语句,key是该语句的DbParameter[])</param>
public static bool RunProcedureTran(Hashtable SQLStringList)
{
using (DbConnection connection = provider.CreateConnection())
{
connection.ConnectionString = connectionString;
connection.Open();
using (DbTransaction trans = connection.BeginTransaction())
{
using (DbCommand cmd = provider.CreateCommand())
{
try
{
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
cmd.Connection = connection;
string storeName = myDE.Value.ToString();
DbParameter[] cmdParms = (DbParameter[])myDE.Key;
cmd.Transaction = trans;
cmd.CommandText = storeName;
cmd.CommandType = CommandType.StoredProcedure;
if (cmdParms != null)
{
foreach (DbParameter parameter in cmdParms)
{
cmd.Parameters.Add(parameter);
}
}
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
trans.Commit();
return true;
}
catch
{
trans.Rollback();
connection.Close();
connection.Dispose();
return false;
}
}
}
}
}
/// <summary>
/// 构建 SqlCommand 对象(用来返回一个结果集,而不是一个整数值)
/// </summary>
/// <param name="connection">数据库连接</param>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlCommand</returns>
private static DbCommand BuildQueryCommand(DbConnection connection,
string storedProcName, DbParameter[] parameters)
{
if (connection.State != ConnectionState.Open)
{
connection.Open();
}
DbCommand command = provider.CreateCommand();
command.CommandText = storedProcName;
command.Connection = connection;
command.CommandType = CommandType.StoredProcedure;
if (parameters != null)
{
foreach (DbParameter parameter in parameters)
{
command.Parameters.Add(parameter);
}
}
return command;
}
#endregion
}
}
3:简单调用
/// <summary>
/// 更新一条数据
/// </summary>
public void Update(Platform.Data.Model.Log model)
{
StringBuilder strSql = new StringBuilder();
strSql.Append("update Log set ");
strSql.Append("ID=@ID,");
strSql.Append("Descript=@Descript,");
strSql.Append("LogType=@LogType,");
strSql.Append("ObjectId=@ObjectId,");
strSql.Append("ObjectName=@ObjectName,");
strSql.Append("ObjectType=@ObjectType,");
strSql.Append("UpdateTime=@UpdateTime,");
strSql.Append("CK=@CK");
strSql.Append(" where ID=@ID ");
Dictionary<string, DbType> list = new Dictionary<string, DbType>();
list.Add("@ID", DbType.Int32);
list.Add("@Descript", DbType.String);
list.Add("@LogType", DbType.String);
list.Add("@ObjectId", DbType.Int32);
list.Add("@ObjectName", DbType.String);
list.Add("@ObjectType", DbType.Int32);
list.Add("@UpdateTime", DbType.Date);
list.Add("@CK", DbType.String);
DbParameter[] parameters = new DbParameter[list.Count];
int key = 0;
foreach (var item in list)
{
DbParameter myParameter = DbHelper.SetDbParameter(item.Key, item.Value);
parameters.SetValue(myParameter, key);
key++;
}
parameters[0].Value = model.ID;
parameters[1].Value = model.Descript;
parameters[2].Value = model.LogType;
parameters[3].Value = model.ObjectId;
parameters[4].Value = model.ObjectName;
parameters[5].Value = model.ObjectType;
parameters[6].Value = model.UpdateTime;
parameters[7].Value = model.CK;
DbHelper.ExecuteSql(strSql.ToString(), parameters);
}
/// <summary>
/// 删除一条数据
/// </summary>
public void Delete(int ID)
{
StringBuilder strSql=new StringBuilder();
strSql.Append("delete from Log ");
strSql.Append(" where ID=@ID ");
DbParameter[] parameters = new DbParameter[1];
DbParameter myParameter = DbHelper.provider.CreateParameter();
myParameter.ParameterName = "@ID";
myParameter.DbType = DbType.Int32;
myParameter.Value = ID;
parameters.SetValue(myParameter, 0);
DbHelper.ExecuteSql(strSql.ToString(), parameters);
}