时间:2021-07-01 10:21:17 帮助过:29人阅读
C#VS2010连接数据库大全 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Configuration; using System.Data.SqlClient; using System.Data; using System.Collections; using System.Data.OracleClie
C#VS2010连接数据库大全
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
using System.Collections;
using System.Data.OracleClient;
using System.Data.OleDb;
namespace SystemFramework
{
public class DataBaseLayer
{
private string connectionString;
private string dbType;
public string DbType
{
get { return dbType; }
set { dbType = value; }
}
public string ConnectionString
{
get
{
if (dbType == string.Empty || dbType == null)
{
return "Access";
}
else
{
return dbType;
}
}
set
{
if (value != string.Empty && value != null)
{
dbType = value;
}
if (dbType == string.Empty || dbType == null)
{
dbType = ConfigurationSettings.AppSettings["DataType"];
}
if (dbType == string.Empty || dbType == null)
{
dbType = "Access";
}
}
}
public DataBaseLayer(string strConnect, string dataType)
{
this.connectionString = strConnect;
this.DbType = dataType;
}
#region 转换参数
private System.Data.IDbDataParameter iDbPara(string ParaName, string DataType)
{
switch (this.DbType)
{
case "SqlServer":
return GetSqlPara(ParaName, DataType);
case "Oracle":
return GetOleDbPara(ParaName, DataType);
case "Access":
return GetOleDbPara(ParaName, DataType);
default:
return GetSqlPara(ParaName, DataType);
}
}
private System.Data.SqlClient.SqlParameter GetSqlPara(string ParaName, string DataType)
{
switch (DataType)
{
case "Decimal":
return new System.Data.SqlClient.SqlParameter(ParaName, System.Data.SqlDbType.Decimal);
case "Varchar":
return new System.Data.SqlClient.SqlParameter(ParaName, System.Data.SqlDbType.VarChar);
case "DateTime":
return new System.Data.SqlClient.SqlParameter(ParaName, System.Data.SqlDbType.DateTime);
case "Iamge":
return new System.Data.SqlClient.SqlParameter(ParaName, System.Data.SqlDbType.Image);
case "Int":
return new System.Data.SqlClient.SqlParameter(ParaName, System.Data.SqlDbType.Int);
case "Text":
return new System.Data.SqlClient.SqlParameter(ParaName, System.Data.SqlDbType.NText);
default:
return new System.Data.SqlClient.SqlParameter(ParaName, System.Data.SqlDbType.VarChar);
}
}
private System.Data.OracleClient.OracleParameter GetOraclePara(string ParaName, string DataType)
{
switch (DataType)
{
case "Decimal":
return new System.Data.OracleClient.OracleParameter(ParaName, System.Data.OracleClient.OracleType.Double);
case "Varchar":
return new System.Data.OracleClient.OracleParameter(ParaName, System.Data.OracleClient.OracleType.VarChar);
case "DateTime":
return new System.Data.OracleClient.OracleParameter(ParaName, System.Data.OracleClient.OracleType.DateTime);
case "Iamge":
return new System.Data.OracleClient.OracleParameter(ParaName, System.Data.OracleClient.OracleType.BFile);
case "Int":
return new System.Data.OracleClient.OracleParameter(ParaName, System.Data.OracleClient.OracleType.Int32);
case "Text":
return new System.Data.OracleClient.OracleParameter(ParaName, System.Data.OracleClient.OracleType.LongVarChar);
default:
return new System.Data.OracleClient.OracleParameter(ParaName, System.Data.OracleClient.OracleType.VarChar);
}
}
private System.Data.OleDb.OleDbParameter GetOleDbPara(string ParaName, string DataType)
{
switch (DataType)
{
case "Decimal":
return new System.Data.OleDb.OleDbParameter(ParaName, System.Data.DbType.Decimal);
case "Varchar":
return new System.Data.OleDb.OleDbParameter(ParaName, System.Data.DbType.String);
case "DateTime":
return new System.Data.OleDb.OleDbParameter(ParaName, System.Data.DbType.DateTime);
case "Iamge":
return new System.Data.OleDb.OleDbParameter(ParaName, System.Data.DbType.Binary);
case "Int":
return new System.Data.OleDb.OleDbParameter(ParaName, System.Data.DbType.Int32);
case "Text":
return new System.Data.OleDb.OleDbParameter(ParaName, System.Data.DbType.String);
default:
return new System.Data.OleDb.OleDbParameter(ParaName, System.Data.DbType.String);
}
}
#endregion
#region 创建 Connection 和 Command
private IDbConnection GetConnection()
{
switch (this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlConnection(this.connectionString);
case "Oracle":
return new System.Data.OracleClient.OracleConnection(this.connectionString);
case "Access":
return new System.Data.OleDb.OleDbConnection(this.connectionString);
default:
return new System.Data.SqlClient.SqlConnection(this.connectionString);
}
}
private IDbCommand GetCommand()
{
switch (this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlCommand();
case "Oracle":
return new System.Data.OracleClient.OracleCommand();
case "Access":
return new System.Data.OleDb.OleDbCommand();
default:
return new System.Data.SqlClient.SqlCommand();
}
}
private IDataAdapter GetAdapater(string Sql, IDbConnection iConn)
{
switch (this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlDataAdapter(Sql, (SqlConnection)iConn);
case "Oracle":
return new System.Data.OracleClient.OracleDataAdapter(Sql, (OracleConnection)iConn);
case "Access":
return new System.Data.OleDb.OleDbDataAdapter(Sql, (OleDbConnection)iConn);
default:
return new System.Data.SqlClient.SqlDataAdapter(Sql, (SqlConnection)iConn); ;
}
}
private IDataAdapter GetAdapater()
{
switch (this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlDataAdapter();
case "Oracle":
return new System.Data.OracleClient.OracleDataAdapter();
case "Access":
return new System.Data.OleDb.OleDbDataAdapter();
default:
return new System.Data.SqlClient.SqlDataAdapter();
}
}
private IDataAdapter GetAdapater(IDbCommand iCmd)
{
switch (this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlDataAdapter((SqlCommand)iCmd);
case "Oracle":
return new System.Data.OracleClient.OracleDataAdapter((OracleCommand)iCmd);
case "Access":
return new System.Data.OleDb.OleDbDataAdapter((OleDbCommand)iCmd);
default:
return new System.Data.SqlClient.SqlDataAdapter((SqlCommand)iCmd);
}
}
#endregion
#region 执行简单SQL语句
/**/
///
int rows = iCmd.ExecuteNonQuery();
return rows;
}
catch (System.Exception E)
{
throw new Exception(E.Message);
}
finally
{
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}
/**/
///
}
}
}
/**/
///
int rows = iCmd.ExecuteNonQuery();
return rows;
}
catch (System.Exception e)
{
throw new Exception(e.Message);
}
finally
{
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}
/**/
///
/**/
///
/**/
///
/**/
///
((OleDbDataAdapter)iAdapter).Fill(dataSet, startIndex, pageSize, tableName);
return dataSet;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
/**/
///
/**/
///
/**/
///
}
}
/**/
///
#endregion
#region 执行带参数的SQL语句
/**/
///
/**/
///
}
}
}
/**/
///
/**/
///
/**/
///
/**/
///
#endregion
#region 存储过程操作
/**/
///
using (SqlCommand sqlCmd = BuildQueryCommand(iConn, storedProcName, parameters))
{
return sqlCmd.ExecuteReader(CommandBehavior.CloseConnection);
}
}
}
/**/
///
using (System.Data.IDbConnection iConn = this.GetConnection())
{
DataSet dataSet = new DataSet();
iConn.Open();
System.Data.IDataAdapter iDA = this.GetAdapater();
iDA = this.GetAdapater(BuildQueryCommand(iConn, storedProcName, parameters));
((SqlDataAdapter)iDA).Fill(dataSet, tableName);
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
return dataSet;
}
}
/**/
///
using (System.Data.IDbConnection iConn = this.GetConnection())
{
DataSet dataSet = new DataSet();
iConn.Open();
System.Data.IDataAdapter iDA = this.GetAdapater();
iDA = this.GetAdapater(BuildQueryCommand(iConn, storedProcName, parameters));
((SqlDataAdapter)iDA).Fill(dataSet, startIndex, pageSize, tableName);
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
return dataSet;
}
}
/**/
///
((SqlDataAdapter)iDA).Fill(dataSet, tableName);
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
return dataSet;
}
}
/**/
///
int result = 0;
using (System.Data.IDbConnection iConn = this.GetConnection())
{
iConn.Open();
using (SqlCommand scmd = BuildQueryCommand(iConn, storedProcName, parameters))
{
result = scmd.ExecuteNonQuery();
}
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
return result;
}
public string RunProcedureExecuteScalar(string storeProcName, IDataParameter[] parameters)
{
string result = string.Empty;
using (System.Data.IDbConnection iConn = this.GetConnection())
{
iConn.Open();
using (SqlCommand scmd = BuildQueryCommand(iConn, storeProcName, parameters))
{
object obj = scmd.ExecuteScalar();
if (obj == null)
result = null;
else
result = obj.ToString();
}
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
return result;
}
/**/
///
IDbCommand iCmd = GetCommand(storedProcName, iConn);
iCmd.CommandType = CommandType.StoredProcedure;
if (parameters == null)
{
return (SqlCommand)iCmd;
}
foreach (IDataParameter parameter in parameters)
{
iCmd.Parameters.Add(parameter);
}
return (SqlCommand)iCmd;
}
/**/
///
if (iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
return result;
}
}
}
/**/
///
private IDbCommand GetCommand(string Sql, IDbConnection iConn)
{
switch (this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlCommand(Sql, (SqlConnection)iConn);
case "Oracle":
return new System.Data.OracleClient.OracleCommand(Sql, (OracleConnection)iConn);
case "Access":
return new System.Data.OleDb.OleDbCommand(Sql, (OleDbConnection)iConn);
default:
return new System.Data.SqlClient.SqlCommand(Sql, (SqlConnection)iConn);
}
}
#endregion
}
}