微软DbHelper
using System;
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Data.OleDb;
using System.Data.SqlClient; namespace JADAY.Frame.DbHelper
{
/// <summary>
/// 数据库助手类
/// </summary>
public class DbUtility
{
private static string dbProviderName = ConfigurationSettings.AppSettings["DbProviderName"];
private static string dbConnectionString = ConfigurationManager.AppSettings["TaxInvoiceConn"]; private DbConnection connection; public DbUtility()
{
this.connection = CreateConnection(DbUtility.dbConnectionString);
} public DbUtility(string connectionString)
{
this.connection = CreateConnection(connectionString);
} public static DbConnection CreateConnection()
{
DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.dbProviderName);
DbConnection dbconn = dbfactory.CreateConnection();
dbconn.ConnectionString = DbUtility.dbConnectionString;
return dbconn;
} public static DbConnection CreateConnection(string connectionString)
{
DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.dbProviderName);
DbConnection dbconn = dbfactory.CreateConnection();
dbconn.ConnectionString = connectionString;
return dbconn;
} public DbCommand GetStoredProcCommond(string storedProcedure)
{
DbCommand dbCommand = connection.CreateCommand();
dbCommand.CommandText = storedProcedure;
dbCommand.CommandType = CommandType.StoredProcedure;
return dbCommand;
} public DbCommand GetSqlStringCommond(string sqlQuery)
{
DbCommand dbCommand = connection.CreateCommand();
dbCommand.CommandText = sqlQuery;
dbCommand.CommandType = CommandType.Text;
return dbCommand;
} #region 增加参数 public void AddParameterCollection(DbCommand cmd, DbParameterCollection dbParameterCollection)
{
foreach (DbParameter dbParameter in dbParameterCollection)
{
cmd.Parameters.Add(dbParameter);
}
} public void AddOutParameter(DbCommand cmd, string parameterName, DbType dbType, int size)
{
DbParameter dbParameter = cmd.CreateParameter();
dbParameter.DbType = dbType;
dbParameter.ParameterName = parameterName;
dbParameter.Size = size;
dbParameter.Direction = ParameterDirection.Output;
cmd.Parameters.Add(dbParameter);
} public void AddInParameter(DbCommand cmd, string parameterName, DbType dbType, object value)
{
DbParameter dbParameter = cmd.CreateParameter();
dbParameter.DbType = dbType;
dbParameter.ParameterName = parameterName;
dbParameter.Value = value;
dbParameter.Direction = ParameterDirection.Input;
cmd.Parameters.Add(dbParameter);
} public void AddReturnParameter(DbCommand cmd, string parameterName, DbType dbType)
{
DbParameter dbParameter = cmd.CreateParameter();
dbParameter.DbType = dbType;
dbParameter.ParameterName = parameterName;
dbParameter.Direction = ParameterDirection.ReturnValue;
cmd.Parameters.Add(dbParameter);
} public DbParameter GetParameter(DbCommand cmd, string parameterName)
{
return cmd.Parameters[parameterName];
} #endregion #region 执行 public DataSet ExecuteDataSet(DbCommand cmd)
{
DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.dbProviderName);
DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
dbDataAdapter.SelectCommand = cmd;
DataSet ds = new DataSet();
dbDataAdapter.Fill(ds);
return ds;
} public DataTable ExecuteDataTable(DbCommand cmd)
{
DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.dbProviderName);
DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
dbDataAdapter.SelectCommand = cmd;
DataTable dataTable = new DataTable();
dbDataAdapter.Fill(dataTable);
return dataTable;
} public DbDataReader ExecuteReader(DbCommand cmd)
{
cmd.Connection.Open();
DbDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return reader;
} public int ExecuteNonQuery(DbCommand cmd)
{
cmd.Connection.Open();
int ret = cmd.ExecuteNonQuery();
cmd.Connection.Close();
return ret;
} public object ExecuteScalar(DbCommand cmd)
{
cmd.Connection.Open();
object ret = cmd.ExecuteScalar();
cmd.Connection.Close();
return ret;
} #endregion #region 执行事务 public DataSet ExecuteDataSet(DbCommand cmd, Trans t)
{
cmd.Connection = t.DbConnection;
cmd.Transaction = t.DbTrans;
DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.dbProviderName);
DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
dbDataAdapter.SelectCommand = cmd;
DataSet ds = new DataSet();
dbDataAdapter.Fill(ds);
return ds;
} public DataTable ExecuteDataTable(DbCommand cmd, Trans t)
{
cmd.Connection = t.DbConnection;
cmd.Transaction = t.DbTrans;
DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.dbProviderName);
DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
dbDataAdapter.SelectCommand = cmd;
DataTable dataTable = new DataTable();
dbDataAdapter.Fill(dataTable);
return dataTable;
} public DbDataReader ExecuteReader(DbCommand cmd, Trans t)
{
cmd.Connection.Close();
cmd.Connection = t.DbConnection;
cmd.Transaction = t.DbTrans;
DbDataReader reader = cmd.ExecuteReader();
DataTable dt = new DataTable();
return reader;
} public int ExecuteNonQuery(DbCommand cmd, Trans t)
{
cmd.Connection.Close();
cmd.Connection = t.DbConnection;
cmd.Transaction = t.DbTrans;
int ret = cmd.ExecuteNonQuery();
return ret;
} public object ExecuteScalar(DbCommand cmd, Trans t)
{
cmd.Connection.Close();
cmd.Connection = t.DbConnection;
cmd.Transaction = t.DbTrans;
object ret = cmd.ExecuteScalar();
return ret;
} #endregion
} public class Trans : IDisposable
{
private DbConnection conn;
private DbTransaction dbTrans;
public DbConnection DbConnection
{
get { return this.conn; }
} public DbTransaction DbTrans
{
get { return this.dbTrans; }
} public Trans()
{
conn = DbUtility.CreateConnection();
conn.Open();
dbTrans = conn.BeginTransaction();
} public Trans(string connectionString)
{
conn = DbUtility.CreateConnection(connectionString);
conn.Open();
dbTrans = conn.BeginTransaction();
} public void Commit()
{
dbTrans.Commit();
this.Colse();
} public void RollBack()
{
dbTrans.Rollback();
this.Colse();
} public void Dispose()
{
this.Colse();
} public void Colse()
{
if (conn.State == System.Data.ConnectionState.Open)
{
conn.Close();
}
}
}
}
2、直接执行sql语句
- DbHelper db = new DbHelper();
- DbCommand cmd = db.GetSqlStringCommond("insert t1 (id)values(‘?haha‘?)");
- db.ExecuteNonQuery(cmd);
3、执行存储过程
- DbHelper db = new DbHelper();
- DbCommand cmd = db.GetStoredProcCommond("t1_insert");
- db.AddInParameter(cmd, "@id", DbType.String, "heihei");
- db.ExecuteNonQuery(cmd);
4、返回DataSet
- DbHelper db = new DbHelper();
- DbCommand cmd = db.GetSqlStringCommond("select * from t1");
- DataSet ds = db.ExecuteDataSet(cmd);
5、返回DataTable
- DbHelper db = new DbHelper();
- DbCommand cmd = db.GetSqlStringCommond("t1_findall");
- DataTable dt = db.ExecuteDataTable(cmd);
6、输入参数/输出参数/返回值的使用(比较重要哦)
- DbHelper db = new DbHelper();
- DbCommand cmd = db.GetStoredProcCommond("t2_insert");
- db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
- db.AddOutParameter(cmd, "@outString", DbType.String, 20);
- db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);
- db.ExecuteNonQuery(cmd);
- string s = db.GetParameter(cmd, "@outString").Value as string;
- int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);
7、DataReader使用
- DbHelper db = new DbHelper();
- DbCommand cmd = db.GetStoredProcCommond("t2_insert");
- db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
- db.AddOutParameter(cmd, "@outString", DbType.String, 20);
- db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);
- using (DbDataReader reader = db.ExecuteReader(cmd))
- {
- dt.Load(reader);
- }
- string s = db.GetParameter(cmd, "@outString").Value as string;
- int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);
8、事务的使用.(项目中需要将基本的数据库操作组合成一个完整的业务流时,代码级的事务是必不可少的哦)
以上我们好像没有指定数据库连接字符串,大家如果看下DbHelper的代码,就知道要使用它必须在config中配置两个参数,如下:
- pubic void DoBusiness()
- {
- using (Trans t = new Trans())
- {
- try
- {
- D1(t);
- throw new Exception();
- D2(t);
- t.Commit();
- }
- catch
- {
- t.RollBack();
- }
- }
- }
- public void D1(Trans t)
- {
- DbHelper db = new DbHelper();
- DbCommand cmd = db.GetStoredProcCommond("table_insert");
- db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
- db.AddOutParameter(cmd, "@outString", DbType.String, 20);
- db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);
- if (t == null) db.ExecuteNonQuery(cmd);
- else db.ExecuteNonQuery(cmd,t);
- string s = db.GetParameter(cmd, "@outString").Value as string;
- int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);
- }
- public void D2(Trans t)
- {
- DbHelper db = new DbHelper();
- DbCommand cmd = db.GetSqlStringCommond("insert table (id)values(@id)");
- if (t == null) db.ExecuteNonQuery(cmd);
- else db.ExecuteNonQuery(cmd, t);
- }
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