trunk/AnywhereTS.DBSupport/DBConnector.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data.Common;
using System.Data;

namespace AnywhereTS.DBSupport
{
    public interface IDBConnector<DBParameter, DBCommand, DBConnection, DBDataAdapter> : IDisposable
        where DBParameter : DbParameter, new()
        where DBCommand : DbCommand, new()
        where DBConnection : DbConnection, new()
        where DBDataAdapter : DbDataAdapter, new()
    {
        bool ConnectionIsOpen { get; }
        void CreateConnection(out Exception ErrorInfo);
        void OpenConnection(out Exception ErrorInfo);
        void CloseConnection(out Exception ErrorInfo);

        DbDataReader ExecuteQuery(string command, List<DBParameter> Params, out Exception ErrorInfo);
        void ExecuteNonQuery(string command, List<DBParameter> Params, out Exception ErrorInfo);
        List<string> ExecuteColumnNamesReader(string command, List<DBParameter> Params, out Exception ErrorInfo);
    }
    public abstract class DBConnector<DBParameter, DBCommand, DBConnection, DBDataAdapter> :
        IDBConnector<DBParameter, DBCommand, DBConnection, DBDataAdapter>
        where DBParameter : DbParameter, new()
        where DBCommand : DbCommand, new()
        where DBConnection : DbConnection, new()
        where DBDataAdapter : DbDataAdapter, new()
    {
        protected DBConnection connection;
        private static string Server = "";
        private static string Database = "";
        private string SafeSqlLiteral(string inputSQL) { return inputSQL.Replace("'", "''"); }
        #region IDBConnector members
        private bool _ConnectionIsOpen;
        public virtual bool ConnectionIsOpen { get { return _ConnectionIsOpen; } protected set { _ConnectionIsOpen = value; } }
        public virtual void CreateConnection(out Exception ErrorInfo)
        {
            ErrorInfo = null;
            try
            {
                string connetionString = null;
                connetionString = string.Format("Data Source={0};Initial Catalog={1};Integrated Security=SSPI", Server, Database);
                connection = new DBConnection();
                connection.ConnectionString = connetionString;
            }
            //catch (SqlException ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex;  throw ErrorInfo;}
            catch (Exception ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo; }
        }
        public virtual void OpenConnection(out Exception ErrorInfo)
        {
            ErrorInfo = null;
            try
            {
                //this.CloseConnection(out ErrorInfo);
                connection.Open();
                this.ConnectionIsOpen = true;
            }
            //catch (SqlException ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex;  throw ErrorInfo;}
            catch (Exception ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo; }
        }
        public virtual void CloseConnection(out Exception ErrorInfo)
        {
            ErrorInfo = null;
            try
            {
                if (this.ConnectionIsOpen)
                    connection.Close();
            }
            //catch (SqlException ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex;  throw ErrorInfo;}
            catch (Exception ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo; }
        }

        public virtual DbDataReader ExecuteQuery(string command, List<DBParameter> Params, out Exception ErrorInfo)
        {
            ErrorInfo = null;
            if (!this.ConnectionIsOpen) { ErrorInfo = new Exception("Cannot execute query.", new Exception("A connection to the database has not, yet, been established.")); }
            try
            {
                command = this.SafeSqlLiteral(command);
                DBCommand sqlComm = new DBCommand();
                sqlComm.CommandText = command;
                sqlComm.Connection = connection;
                foreach (DBParameter p in Params) { sqlComm.Parameters.Add(p); }
                DbDataReader r = sqlComm.ExecuteReader();
                return r;
            }
            catch (Exception ex) { ErrorInfo = new Exception("Cannot execute query.", ex); }
            return null;
        }
        public virtual void ExecuteNonQuery(string command, List<DBParameter> Params, out Exception ErrorInfo)
        {
            ErrorInfo = null;
            if (!this.ConnectionIsOpen) { ErrorInfo = new Exception("Cannot execute non-query.", new Exception("A connection to the database has not, yet, been established.")); }
            try
            {
                command = this.SafeSqlLiteral(command);
                DBCommand sqlComm = new DBCommand();
                sqlComm.CommandText = command;
                sqlComm.Connection = connection;
                foreach (DBParameter p in Params) { sqlComm.Parameters.Add(p); }
                sqlComm.ExecuteNonQuery();
            }
            catch (Exception ex) { ErrorInfo = new Exception("Cannot execute non-query.", ex); }
        }
        public virtual List<string> ExecuteColumnNamesReader(string command, List<DBParameter> Params, out Exception ErrorInfo)
        {
            ErrorInfo = null;
            try
            {
                List<string> ColumnNames = new List<string>();
                DBDataAdapter da = new DBDataAdapter();
                command = this.SafeSqlLiteral(command);
                DBCommand sqlComm = new DBCommand();
                sqlComm.CommandText = command;
                sqlComm.Connection = connection;
                foreach (DBParameter p in Params) { sqlComm.Parameters.Add(p); }
                da.SelectCommand = sqlComm;
                DataTable dt = new DataTable();
                da.Fill(dt);
                DataRow row = dt.Rows[0];
                for (int ordinal = 0; ordinal < dt.Columns.Count; ordinal++)
                {
                    string value = row[ordinal].ToString();
                    string column_name = dt.Columns[ordinal].ColumnName;
                    ColumnNames.Add(column_name);
                }
                return ColumnNames;
            }
            catch (Exception ex) { ErrorInfo = new Exception("Cannot get column names from reader.", ex); }
            return new List<string>();
        }

        #endregion

        #region IDisposable Members
        public virtual void Dispose()
        {
            try
            {
                Exception ErrorInfo;
                CloseConnection(out ErrorInfo);
            }
            catch
            {
            }
        }
        #endregion
    }
}
1	william	84	using System;
2			using System.Collections.Generic;
3			using System.Text;
4			using System.Data.SqlClient;
5			using System.Data.Common;
6			using System.Data;
7
8			namespace AnywhereTS.DBSupport
9			{
10			public interface IDBConnector<DBParameter, DBCommand, DBConnection, DBDataAdapter> : IDisposable
11			where DBParameter : DbParameter, new()
12			where DBCommand : DbCommand, new()
13			where DBConnection : DbConnection, new()
14			where DBDataAdapter : DbDataAdapter, new()
15			{
16			bool ConnectionIsOpen { get; }
17			void CreateConnection(out Exception ErrorInfo);
18			void OpenConnection(out Exception ErrorInfo);
19			void CloseConnection(out Exception ErrorInfo);
20
21			DbDataReader ExecuteQuery(string command, List<DBParameter> Params, out Exception ErrorInfo);
22			void ExecuteNonQuery(string command, List<DBParameter> Params, out Exception ErrorInfo);
23			List<string> ExecuteColumnNamesReader(string command, List<DBParameter> Params, out Exception ErrorInfo);
24			}
25			public abstract class DBConnector<DBParameter, DBCommand, DBConnection, DBDataAdapter> :
26			IDBConnector<DBParameter, DBCommand, DBConnection, DBDataAdapter>
27			where DBParameter : DbParameter, new()
28			where DBCommand : DbCommand, new()
29			where DBConnection : DbConnection, new()
30			where DBDataAdapter : DbDataAdapter, new()
31			{
32			protected DBConnection connection;
33			private static string Server = "";
34			private static string Database = "";
35			private string SafeSqlLiteral(string inputSQL) { return inputSQL.Replace("'", "''"); }
36			#region IDBConnector members
37			private bool _ConnectionIsOpen;
38			public virtual bool ConnectionIsOpen { get { return _ConnectionIsOpen; } protected set { _ConnectionIsOpen = value; } }
39			public virtual void CreateConnection(out Exception ErrorInfo)
40			{
41			ErrorInfo = null;
42			try
43			{
44			string connetionString = null;
45			connetionString = string.Format("Data Source={0};Initial Catalog={1};Integrated Security=SSPI", Server, Database);
46			connection = new DBConnection();
47			connection.ConnectionString = connetionString;
48			}
49			//catch (SqlException ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo;}
50			catch (Exception ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo; }
51			}
52			public virtual void OpenConnection(out Exception ErrorInfo)
53			{
54			ErrorInfo = null;
55			try
56			{
57			//this.CloseConnection(out ErrorInfo);
58			connection.Open();
59			this.ConnectionIsOpen = true;
60			}
61			//catch (SqlException ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo;}
62			catch (Exception ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo; }
63			}
64			public virtual void CloseConnection(out Exception ErrorInfo)
65			{
66			ErrorInfo = null;
67			try
68			{
69			if (this.ConnectionIsOpen)
70			connection.Close();
71			}
72			//catch (SqlException ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo;}
73			catch (Exception ex) { Console.WriteLine(ex.ToString()); ErrorInfo = ex; throw ErrorInfo; }
74			}
75
76			public virtual DbDataReader ExecuteQuery(string command, List<DBParameter> Params, out Exception ErrorInfo)
77			{
78			ErrorInfo = null;
79			if (!this.ConnectionIsOpen) { ErrorInfo = new Exception("Cannot execute query.", new Exception("A connection to the database has not, yet, been established.")); }
80			try
81			{
82			command = this.SafeSqlLiteral(command);
83			DBCommand sqlComm = new DBCommand();
84			sqlComm.CommandText = command;
85			sqlComm.Connection = connection;
86			foreach (DBParameter p in Params) { sqlComm.Parameters.Add(p); }
87			DbDataReader r = sqlComm.ExecuteReader();
88			return r;
89			}
90			catch (Exception ex) { ErrorInfo = new Exception("Cannot execute query.", ex); }
91			return null;
92			}
93			public virtual void ExecuteNonQuery(string command, List<DBParameter> Params, out Exception ErrorInfo)
94			{
95			ErrorInfo = null;
96			if (!this.ConnectionIsOpen) { ErrorInfo = new Exception("Cannot execute non-query.", new Exception("A connection to the database has not, yet, been established.")); }
97			try
98			{
99			command = this.SafeSqlLiteral(command);
100			DBCommand sqlComm = new DBCommand();
101			sqlComm.CommandText = command;
102			sqlComm.Connection = connection;
103			foreach (DBParameter p in Params) { sqlComm.Parameters.Add(p); }
104			sqlComm.ExecuteNonQuery();
105			}
106			catch (Exception ex) { ErrorInfo = new Exception("Cannot execute non-query.", ex); }
107			}
108			public virtual List<string> ExecuteColumnNamesReader(string command, List<DBParameter> Params, out Exception ErrorInfo)
109			{
110			ErrorInfo = null;
111			try
112			{
113			List<string> ColumnNames = new List<string>();
114			DBDataAdapter da = new DBDataAdapter();
115			command = this.SafeSqlLiteral(command);
116			DBCommand sqlComm = new DBCommand();
117			sqlComm.CommandText = command;
118			sqlComm.Connection = connection;
119			foreach (DBParameter p in Params) { sqlComm.Parameters.Add(p); }
120			da.SelectCommand = sqlComm;
121			DataTable dt = new DataTable();
122			da.Fill(dt);
123			DataRow row = dt.Rows[0];
124			for (int ordinal = 0; ordinal < dt.Columns.Count; ordinal++)
125			{
126			string value = row[ordinal].ToString();
127			string column_name = dt.Columns[ordinal].ColumnName;
128			ColumnNames.Add(column_name);
129			}
130			return ColumnNames;
131			}
132			catch (Exception ex) { ErrorInfo = new Exception("Cannot get column names from reader.", ex); }
133			return new List<string>();
134			}
135
136			#endregion
137
138			#region IDisposable Members
139			public virtual void Dispose()
140			{
141			try
142			{
143			Exception ErrorInfo;
144			CloseConnection(out ErrorInfo);
145			}
146			catch
147			{
148			}
149			}
150			#endregion
151			}
152			}