暂时只有三个Helper,分别是MySqlHelper/OracleHelper/SQLHelper(MSSqlServer).
暂时只有三个Helper,分别是MySqlHelper/OracleHelper/SQLHelper(MSSqlServer).MySQLHelper是取自mysql-connector-net-5.0.8.1的(dev.mysql.com有下载),其余两个取自.NET Pet Shop 4.0,简单将它们放到一个命名空间内了.这里下载

SqlHelper
1
namespace Alacky.DBUtility
{
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3
/**//// <summary>
4
/// The SqlHelper class is intended to encapsulate high performance,
5
/// scalable best practices for common uses of SqlClient.
6
/// </summary>
7
public abstract class SqlHelper
{
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// Hashtable to store cached parameters
10
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
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/**//// <summary>
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/// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string
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/// using the provided parameters.
15
/// </summary>
16
/// <remarks>
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/// e.g.:
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/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
19
/// </remarks>
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/// <param name="connectionString">a valid connection string for a SqlConnection</param>
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/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
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/// <param name="commandText">the stored procedure name or T-SQL command</param>
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/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
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/// <returns>an int representing the number of rows affected by the command</returns>
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public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
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SqlCommand cmd = new SqlCommand();
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using (SqlConnection conn = new SqlConnection(connectionString))
{
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PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
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int val = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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return val;
34
}
35
}
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/**//// <summary>
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/// Execute a SqlCommand (that returns no resultset) against an existing database connection
39
/// using the provided parameters.
40
/// </summary>
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/// <remarks>
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/// e.g.:
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/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
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/// </remarks>
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/// <param name="conn">an existing database connection</param>
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/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
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/// <param name="commandText">the stored procedure name or T-SQL command</param>
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/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
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/// <returns>an int representing the number of rows affected by the command</returns>
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public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
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SqlCommand cmd = new SqlCommand();
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PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
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int val = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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return val;
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}
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/**//// <summary>
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/// Execute a SqlCommand (that returns no resultset) using an existing SQL Transaction
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/// using the provided parameters.
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/// </summary>
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/// <remarks>
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/// e.g.:
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/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
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/// </remarks>
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/// <param name="trans">an existing sql transaction</param>
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/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
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/// <param name="commandText">the stored procedure name or T-SQL command</param>
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/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
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/// <returns>an int representing the number of rows affected by the command</returns>
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public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
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SqlCommand cmd = new SqlCommand();
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PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
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int val = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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return val;
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}
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/**//// <summary>
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/// Execute a SqlCommand that returns a resultset against the database specified in the connection string
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/// using the provided parameters.
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/// </summary>
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/// <remarks>
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/// e.g.:
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/// SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
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/// </remarks>
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/// <param name="connectionString">a valid connection string for a SqlConnection</param>
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/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
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/// <param name="commandText">the stored procedure name or T-SQL command</param>
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/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
93
/// <returns>A SqlDataReader containing the results</returns>
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public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
95
SqlCommand cmd = new SqlCommand();
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SqlConnection conn = new SqlConnection(connectionString);
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// we use a try/catch here because if the method throws an exception we want to
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// close the connection throw code, because no datareader will exist, hence the
100
// commandBehaviour.CloseConnection will not work
101
try
{
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PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
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SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
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cmd.Parameters.Clear();
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return rdr;
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}
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catch
{
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conn.Close();
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throw;
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}
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}
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/**//// <summary>
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/// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string
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/// using the provided parameters.
116
/// </summary>
117
/// <remarks>
118
/// e.g.:
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/// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
120
/// </remarks>
121
/// <param name="connectionString">a valid connection string for a SqlConnection</param>
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/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
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/// <param name="commandText">the stored procedure name or T-SQL command</param>
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/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
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/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
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public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
127
SqlCommand cmd = new SqlCommand();
128
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using (SqlConnection connection = new SqlConnection(connectionString))
{
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PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
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object val = cmd.ExecuteScalar();
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cmd.Parameters.Clear();
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return val;
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}
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}
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/**//// <summary>
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/// Execute a SqlCommand that returns the first column of the first record against an existing database connection
139
/// using the provided parameters.
140
/// </summary>
141
/// <remarks>
142
/// e.g.:
143
/// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
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/// </remarks>
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/// <param name="conn">an existing database connection</param>
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/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
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/// <param name="commandText">the stored procedure name or T-SQL command</param>
148
/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
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/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
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public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
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SqlCommand cmd = new SqlCommand();
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PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
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object val = cmd.ExecuteScalar();
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cmd.Parameters.Clear();
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return val;
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}
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/**//// <summary>
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/// add parameter array to the cache
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/// </summary>
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/// <param name="cacheKey">Key to the parameter cache</param>
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/// <param name="cmdParms">an array of SqlParamters to be cached</param>
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public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
{
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parmCache[cacheKey] = commandParameters;
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}
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/**//// <summary>
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/// Retrieve cached parameters
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/// </summary>
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/// <param name="cacheKey">key used to lookup parameters</param>
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/// <returns>Cached SqlParamters array</returns>
174
public static SqlParameter[] GetCachedParameters(string cacheKey)
{
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SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
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if (cachedParms == null)
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return null;
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SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];
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for (int i = 0, j = cachedParms.Length; i < j; i++)
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clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();
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return clonedParms;
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}
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/**//// <summary>
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/// Prepare a command for execution
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/// </summary>
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/// <param name="cmd">SqlCommand object</param>
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/// <param name="conn">SqlConnection object</param>
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/// <param name="trans">SqlTransaction object</param>
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/// <param name="cmdType">Cmd type e.g. stored procedure or text</param>
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/// <param name="cmdText">Command text, e.g. Select * from Products</param>
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/// <param name="cmdParms">SqlParameters to use in the command</param>
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private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
{
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if (conn.State != ConnectionState.Open)
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conn.Open();
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cmd.Connection = conn;
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cmd.CommandText = cmdText;
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if (trans != null)
206
cmd.Transaction = trans;
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cmd.CommandType = cmdType;
209
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if (cmdParms != null)
{
211
foreach (SqlParameter parm in cmdParms)
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cmd.Parameters.Add(parm);
213
}
214
}
215
}
216
}

OracleHelper
1
using System;
2
using System.Configuration;
3
using System.Data;
4
using System.Data.OracleClient;
5
using System.Collections;
6
7
namespace Alacky.DBUtility
{
8
9
/**//// <summary>
10
/// A helper class used to execute queries against an Oracle database
11
/// </summary>
12
public abstract class OracleHelper
{
13
14
//Create a hashtable for the parameter cached
15
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
16
17
/**//// <summary>
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/// Execute a database query which does not include a select
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/// </summary>
20
/// <param name="connString">Connection string to database</param>
21
/// <param name="cmdType">Command type either stored procedure or SQL</param>
22
/// <param name="cmdText">Acutall SQL Command</param>
23
/// <param name="commandParameters">Parameters to bind to the command</param>
24
/// <returns></returns>
25
public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
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// Create a new Oracle command
27
OracleCommand cmd = new OracleCommand();
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//Create a connection
30
using (OracleConnection connection = new OracleConnection(connectionString))
{
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//Prepare the command
33
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
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//Execute the command
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int val = cmd.ExecuteNonQuery();
37
cmd.Parameters.Clear();
38
return val;
39
}
40
}
41
42
/**//// <summary>
43
/// Execute an OracleCommand (that returns no resultset) against an existing database transaction
44
/// using the provided parameters.
45
/// </summary>
46
/// <remarks>
47
/// e.g.:
48
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
49
/// </remarks>
50
/// <param name="trans">an existing database transaction</param>
51
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
52
/// <param name="commandText">the stored procedure name or PL/SQL command</param>
53
/// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
54
/// <returns>an int representing the number of rows affected by the command</returns>
55
public static int ExecuteNonQuery(OracleTransaction trans, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
56
OracleCommand cmd = new OracleCommand();
57
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
58
int val = cmd.ExecuteNonQuery();
59
cmd.Parameters.Clear();
60
return val;
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}
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63
/**//// <summary>
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/// Execute an OracleCommand (that returns no resultset) against an existing database connection
65
/// using the provided parameters.
66
/// </summary>
67
/// <remarks>
68
/// e.g.:
69
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
70
/// </remarks>
71
/// <param name="conn">an existing database connection</param>
72
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
73
/// <param name="commandText">the stored procedure name or PL/SQL command</param>
74
/// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
75
/// <returns>an int representing the number of rows affected by the command</returns>
76
public static int ExecuteNonQuery(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
77
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OracleCommand cmd = new OracleCommand();
79
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PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
81
int val = cmd.ExecuteNonQuery();
82
cmd.Parameters.Clear();
83
return val;
84
}
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/**//// <summary>
87
/// Execute a select query that will return a result set
88
/// </summary>
89
/// <param name="connString">Connection string</param>
90
//// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
91
/// <param name="commandText">the stored procedure name or PL/SQL command</param>
92
/// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
93
/// <returns></returns>
94
public static OracleDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
95
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//Create the command and connection
97
OracleCommand cmd = new OracleCommand();
98
OracleConnection conn = new OracleConnection(connectionString);
99
100
try
{
101
//Prepare the command to execute
102
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
103
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//Execute the query, stating that the connection should close when the resulting datareader has been read
105
OracleDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
106
cmd.Parameters.Clear();
107
return rdr;
108
109
}
110
catch
{
111
112
//If an error occurs close the connection as the reader will not be used and we expect it to close the connection
113
conn.Close();
114
throw;
115
}
116
}
117
118
/**//// <summary>
119
/// Execute an OracleCommand that returns the first column of the first record against the database specified in the connection string
120
/// using the provided parameters.
121
/// </summary>
122
/// <remarks>
123
/// e.g.:
124
/// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
125
/// </remarks>
126
/// <param name="connectionString">a valid connection string for a SqlConnection</param>
127
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
128
/// <param name="commandText">the stored procedure name or PL/SQL command</param>
129
/// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
130
/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
131
public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
132
OracleCommand cmd = new OracleCommand();
133
134
using (OracleConnection conn = new OracleConnection(connectionString))
{
135
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
136
object val = cmd.ExecuteScalar();
137
cmd.Parameters.Clear();
138
return val;
139
}
140
}
141
142
/**//// <summary>
143
/// Execute a OracleCommand (that returns a 1x1 resultset) against the specified SqlTransaction
144
/// using the provided parameters.
145
/// </summary>
146
/// <param name="transaction">A valid SqlTransaction</param>
147
/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
148
/// <param name="commandText">The stored procedure name or PL/SQL command</param>
149
/// <param name="commandParameters">An array of OracleParamters used to execute the command</param>
150
/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
151
public static object ExecuteScalar(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
{
152
if(transaction == null)
153
throw new ArgumentNullException("transaction");
154
if(transaction != null && transaction.Connection == null)
155
throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
156
157
// Create a command and prepare it for execution
158
OracleCommand cmd = new OracleCommand();
159
160
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
161
162
// Execute the command & return the results
163
object retval = cmd.ExecuteScalar();
164
165
// Detach the SqlParameters from the command object, so they can be used again
166
cmd.Parameters.Clear();
167
return retval;
168
}
169
170
/**//// <summary>
171
/// Execute an OracleCommand that returns the first column of the first record against an existing database connection
172
/// using the provided parameters.
173
/// </summary>
174
/// <remarks>
175
/// e.g.:
176
/// Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
177
/// </remarks>
178
/// <param name="conn">an existing database connection</param>
179
/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
180
/// <param name="commandText">the stored procedure name or PL/SQL command</param>
181
/// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
182
/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
183
public static object ExecuteScalar(OracleConnection connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
184
OracleCommand cmd = new OracleCommand();
185
186
PrepareCommand(cmd, connectionString, null, cmdType, cmdText, commandParameters);
187
object val = cmd.ExecuteScalar();
188
cmd.Parameters.Clear();
189
return val;
190
}
191
192
/**//// <summary>
193
/// Add a set of parameters to the cached
194
/// </summary>
195
/// <param name="cacheKey">Key value to look up the parameters</param>
196
/// <param name="commandParameters">Actual parameters to cached</param>
197
public static void CacheParameters(string cacheKey, params OracleParameter[] commandParameters)
{
198
parmCache[cacheKey] = commandParameters;
199
}
200
201
/**//// <summary>
202
/// Fetch parameters from the cache
203
/// </summary>
204
/// <param name="cacheKey">Key to look up the parameters</param>
205
/// <returns></returns>
206
public static OracleParameter[] GetCachedParameters(string cacheKey)
{
207
OracleParameter[] cachedParms = (OracleParameter[])parmCache[cacheKey];
208
209
if (cachedParms == null)
210
return null;
211
212
// If the parameters are in the cache
213
OracleParameter[] clonedParms = new OracleParameter[cachedParms.Length];
214
215
// return a copy of the parameters
216
for (int i = 0, j = cachedParms.Length; i < j; i++)
217
clonedParms[i] = (OracleParameter)((ICloneable)cachedParms[i]).Clone();
218
219
return clonedParms;
220
}
221
222
/**//// <summary>
223
/// Internal function to prepare a command for execution by the database
224
/// </summary>
225
/// <param name="cmd">Existing command object</param>
226
/// <param name="conn">Database connection object</param>
227
/// <param name="trans">Optional transaction object</param>
228
/// <param name="cmdType">Command type, e.g. stored procedure</param>
229
/// <param name="cmdText">Command test</param>
230
/// <param name="commandParameters">Parameters for the command</param>
231
private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, CommandType cmdType, string cmdText, OracleParameter[] commandParameters)
{
232
233
//Open the connection if required
234
if (conn.State != ConnectionState.Open)
235
conn.Open();
236
237
//Set up the command
238
cmd.Connection = conn;
239
cmd.CommandText = cmdText;
240
cmd.CommandType = cmdType;
241
242
//Bind it to the transaction if it exists
243
if (trans != null)
244
cmd.Transaction = trans;
245
246
// Bind the parameters passed in
247
if (commandParameters != null)
{
248
foreach (OracleParameter parm in commandParameters)
249
cmd.Parameters.Add(parm);
250
}
251
}
252
253
/**//// <summary>
254
/// Converter to use boolean data type with Oracle
255
/// </summary>
256
/// <param name="value">Value to convert</param>
257
/// <returns></returns>
258
public static string OraBit(bool value)
{
259
if(value)
260
return "Y";
261
else
262
return "N";
263
}
264
265
/**//// <summary>
266
/// Converter to use boolean data type with Oracle
267
/// </summary>
268
/// <param name="value">Value to convert</param>
269
/// <returns></returns>
270
public static bool OraBool(string value)
{
271
if(value.Equals("Y"))
272
return true;
273
else
274
return false;
275
}
276
}
277
}
278

MySQLHelper
1
using System;
2
using System.Configuration;
3
using System.Data;
4
using MySql.Data.MySqlClient;
5
using MySql.Data.Types;
6
using System.Collections;
7
8
namespace Alacky.DBUtility
9

{
10
public abstract class MySQLHelper
11
{
12
public static DataRow ExecuteDataRow(string connectionString, string commandText, params MySqlParameter[] parms)
13
{
14
return MySql.Data.MySqlClient.MySqlHelper.ExecuteDataRow(connectionString, commandText, parms);
15
}
16
public static DataSet ExecuteDataset(MySqlConnection connection, string commandText)
17
{
18
return MySql.Data.MySqlClient.MySqlHelper.ExecuteDataset(connection, commandText);
19
}
20
public static DataSet ExecuteDataset(string connectionString, string commandText)
21
{
22
return MySql.Data.MySqlClient.MySqlHelper.ExecuteDataset(connectionString, commandText);
23
}
24
public static DataSet ExecuteDataset(MySqlConnection connection, string commandText, params MySqlParameter[] commandParameters)
25
{
26
return MySql.Data.MySqlClient.MySqlHelper.ExecuteDataset(connection, commandText, commandParameters);
27
}
28
public static DataSet ExecuteDataset(string connectionString, string commandText, params MySqlParameter[] commandParameters)
29
{
30
return MySql.Data.MySqlClient.MySqlHelper.ExecuteDataset(connectionString, commandText, commandParameters);
31
}
32
public static int ExecuteNonQuery(MySqlConnection connection, string commandText, params MySqlParameter[] commandParameters)
33
{
34
return MySql.Data.MySqlClient.MySqlHelper.ExecuteNonQuery(connection, commandText, commandParameters);
35
}
36
public static int ExecuteNonQuery(string connectionString, string commandText, params MySqlParameter[] parms)
37
{
38
return MySql.Data.MySqlClient.MySqlHelper.ExecuteNonQuery(connectionString, commandText, parms);
39
}
40
public static MySqlDataReader ExecuteReader(string connectionString, string commandText)
41
{
42
return MySql.Data.MySqlClient.MySqlHelper.ExecuteReader(connectionString, commandText);
43
}
44
public static MySqlDataReader ExecuteReader(string connectionString, string commandText, params MySqlParameter[] commandParameters)
45
{
46
return MySql.Data.MySqlClient.MySqlHelper.ExecuteReader(connectionString, commandText, commandParameters);
47
}
48
public static object ExecuteScalar(MySqlConnection connection, string commandText)
49
{
50
return MySql.Data.MySqlClient.MySqlHelper.ExecuteScalar(connection, commandText);
51
}
52
public static object ExecuteScalar(string connectionString, string commandText)
53
{
54
return MySql.Data.MySqlClient.MySqlHelper.ExecuteScalar(connectionString, commandText);
55
}
56
public static object ExecuteScalar(MySqlConnection connection, string commandText, params MySqlParameter[] commandParameters)
57
{
58
return MySql.Data.MySqlClient.MySqlHelper.ExecuteScalar(connection, commandText, commandParameters);
59
}
60
public static object ExecuteScalar(string connectionString, string commandText, params MySqlParameter[] commandParameters)
61
{
62
return MySql.Data.MySqlClient.MySqlHelper.ExecuteScalar(connectionString, commandText, commandParameters);
63
}
64
public static void UpdateDataSet(string connectionString, string commandText, DataSet ds, string tablename)
65
{
66
MySql.Data.MySqlClient.MySqlHelper.UpdateDataSet(connectionString, commandText, ds, tablename);
67
}
68
}
69
}
70