using System;
using System.Configuration;
using System.Data;
using System.Collections;
using System.Collections.Generic;
using MySql.Data.MySqlClient;
namespace FangYar.DBUtility
{
///
/// A helper class used to execute queries against an Oracle database
///
public abstract class OracleHelper
{
// Read the connection strings from the configuration file
public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.AppSettings["OraConnString1"];
public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.AppSettings["OraConnString2"];
public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.AppSettings["OraConnString3"];
public static readonly string ConnectionStringProfile = ConfigurationManager.AppSettings["OraProfileConnString"];
public static readonly string ConnectionStringMembership = ConfigurationManager.AppSettings["OraMembershipConnString"];
//Create a hashtable for the parameter cached
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
///
/// Execute a database query which does not include a select
///
/// Connection string to database
/// Command type either stored procedure or SQL
/// Acutall SQL Command
/// Parameters to bind to the command
///
public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
{
// Create a new Oracle command
MySqlCommand cmd = new MySqlCommand();
//Create a connection
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
//Prepare the command
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
//Execute the command
int val = cmd.ExecuteNonQuery();
connection.Close();
cmd.Parameters.Clear();
return val;
}
}
///
/// 执行查询语句，返回DataSet
///
/// 查询语句
/// DataSet
public static DataSet Query(string connectionString, string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (connection.State != ConnectionState.Closed)
{
connection.Close();
}
}
return ds;
}
}
public static DataSet Query(string connectionString, string SQLString, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (connection.State != ConnectionState.Closed)
{
connection.Close();
}
}
return ds;
}
}
}
private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] 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 (MySqlParameter parameter in cmdParms)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
}
///
/// 执行一条计算查询结果语句，返回查询结果（object）。
///
/// 计算查询结果语句
/// 查询结果（object）
public static object GetSingle(string connectionString, string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (connection.State != ConnectionState.Closed)
{
connection.Close();
}
}
}
}
}
public static bool Exists(string connectionString,string strOracle)
{
object obj = OracleHelper.GetSingle(connectionString,strOracle);
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;
}
}
///
/// Execute an MySqlCommand (that returns no resultset) against an existing database transaction
/// using the provided parameters.
///
///
/// e.g.:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));
///
/// an existing database transaction
/// the CommandType (stored procedure, text, etc.)
/// the stored procedure name or PL/SQL command
/// an array of OracleParamters used to execute the command
/// an int representing the number of rows affected by the command
public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
///
/// Execute an MySqlCommand (that returns no resultset) against an existing database connection
/// using the provided parameters.
///
///
/// e.g.:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));
///
/// an existing database connection
/// the CommandType (stored procedure, text, etc.)
/// the stored procedure name or PL/SQL command
/// an array of OracleParamters used to execute the command
/// an int representing the number of rows affected by the command
public static int ExecuteNonQuery(MySqlConnection connection, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
///
/// Execute an MySqlCommand (that returns no resultset) against an existing database connection
/// using the provided parameters.
///
///
/// e.g.:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));
///
/// an existing database connection
/// the stored procedure name or PL/SQL command
/// an int representing the number of rows affected by the command
public static int ExecuteNonQuery(string connectionString, string cmdText)
{
MySqlCommand cmd = new MySqlCommand();
MySqlConnection connection = new MySqlConnection(connectionString);
PrepareCommand(cmd, connection, null, CommandType.Text, cmdText, null);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
///
/// Execute a select query that will return a result set
///
/// Connection string
//// the CommandType (stored procedure, text, etc.)
/// the stored procedure name or PL/SQL command
/// an array of OracleParamters used to execute the command
///
public static MySqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
{
MySqlCommand cmd = new MySqlCommand();
MySqlConnection conn = new MySqlConnection(connectionString);
try
{
//Prepare the command to execute
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
MySqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch
{
conn.Close();
throw;
}
}
///
/// Execute an MySqlCommand that returns the first column of the first record against the database specified in the connection string
/// using the provided parameters.
///
///
/// e.g.:
/// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));
///
/// a valid connection string for a SqlConnection
/// the CommandType (stored procedure, text, etc.)
/// the stored procedure name or PL/SQL command
/// an array of OracleParamters used to execute the command
/// An object that should be converted to the expected type using Convert.To{Type}
public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
{
MySqlCommand cmd = new MySqlCommand();
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
}
///
/// Execute a MySqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
/// using the provided parameters.
///
/// A valid SqlTransaction
/// The CommandType (stored procedure, text, etc.)
/// The stored procedure name or PL/SQL command
/// An array of OracleParamters used to execute the command
/// An object containing the value in the 1x1 resultset generated by the command
public static object ExecuteScalar(MySqlTransaction transaction, CommandType commandType, string commandText, params MySqlParameter[] commandParameters)
{
if (transaction == null)
throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null)
throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
// Create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
// Execute the command & return the results
object retval = cmd.ExecuteScalar();
// Detach the SqlParameters from the command object, so they can be used again
cmd.Parameters.Clear();
return retval;
}
///
/// Execute an MySqlCommand that returns the first column of the first record against an existing database connection
/// using the provided parameters.
///
///
/// e.g.:
/// Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));
///
/// an existing database connection
/// the CommandType (stored procedure, text, etc.)
/// the stored procedure name or PL/SQL command
/// an array of OracleParamters used to execute the command
/// An object that should be converted to the expected type using Convert.To{Type}
public static object ExecuteScalar(MySqlConnection connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connectionString, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
///
/// Add a set of parameters to the cached
///
/// Key value to look up the parameters
/// Actual parameters to cached
public static void CacheParameters(string cacheKey, params MySqlParameter[] commandParameters)
{
parmCache[cacheKey] = commandParameters;
}
///
/// Fetch parameters from the cache
///
/// Key to look up the parameters
///
public static MySqlParameter[] GetCachedParameters(string cacheKey)
{
MySqlParameter[] cachedParms = (MySqlParameter[])parmCache[cacheKey];
if (cachedParms == null)
return null;
// If the parameters are in the cache
MySqlParameter[] clonedParms = new MySqlParameter[cachedParms.Length];
// return a copy of the parameters
for (int i = 0, j = cachedParms.Length; i < j; i++)
clonedParms[i] = (MySqlParameter)((ICloneable)cachedParms[i]).Clone();
return clonedParms;
}
///
/// Internal function to prepare a command for execution by the database
///
/// Existing command object
/// Database connection object
/// Optional transaction object
/// Command type, e.g. stored procedure
/// Command test
/// Parameters for the command
private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, MySqlParameter[] commandParameters)
{
//Open the connection if required
if (conn.State != ConnectionState.Open)
conn.Open();
//Set up the command
cmd.Connection = conn;
cmd.CommandText = cmdText;
cmd.CommandType = cmdType;
//Bind it to the transaction if it exists
if (trans != null)
cmd.Transaction = trans;
// Bind the parameters passed in
if (commandParameters != null)
{
foreach (MySqlParameter parm in commandParameters)
cmd.Parameters.Add(parm);
}
}
///
/// Converter to use boolean data type with Oracle
///
/// Value to convert
///
public static string OraBit(bool value)
{
if (value)
return "Y";
else
return "N";
}
///
/// Converter to use boolean data type with Oracle
///
/// Value to convert
///
public static bool OraBool(string value)
{
if (value.Equals("Y"))
return true;
else
return false;
}
///
/// 执行多条SQL语句，实现数据库事务。
///
/// 多条SQL语句
public static bool ExecuteSqlTran(string conStr, List cmdList)
{
using (MySqlConnection conn = new MySqlConnection(conStr))
{
conn.Open();
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
MySqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
foreach (CommandInfo c in cmdList)
{
if (!String.IsNullOrEmpty(c.CommandText))
{
PrepareCommand(cmd, conn, tx, CommandType.Text, c.CommandText, (MySqlParameter[])c.Parameters);
if (c.EffentNextType == EffentNextType.WhenHaveContine || c.EffentNextType == EffentNextType.WhenNoHaveContine)
{
if (c.CommandText.ToLower().IndexOf("count(") == -1)
{
tx.Rollback();
throw new Exception("Oracle:违背要求" + c.CommandText + "必须符合select count(..的格式");
//return false;
}
object obj = cmd.ExecuteScalar();
bool isHave = false;
if (obj == null && obj == DBNull.Value)
{
isHave = false;
}
isHave = Convert.ToInt32(obj) > 0;
if (c.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
{
tx.Rollback();
throw new Exception("Oracle:违背要求" + c.CommandText + "返回值必须大于0");
//return false;
}
if (c.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
{
tx.Rollback();
throw new Exception("Oracle:违背要求" + c.CommandText + "返回值必须等于0");
//eturn false;
}
continue;
}
int res = cmd.ExecuteNonQuery();
if (c.EffentNextType == EffentNextType.ExcuteEffectRows && res == 0)
{
tx.Rollback();
throw new Exception("Oracle:违背要求" + c.CommandText + "必须有影像行");
// return false;
}
}
}
tx.Commit();
return true;
}
catch (Exception E)
{
tx.Rollback();
throw E;
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
}
}
}
}
///
/// 执行多条SQL语句，实现数据库事务。
///
/// 多条SQL语句
public static void ExecuteSqlTran(string conStr,List SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(conStr))
{
conn.Open();
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
MySqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
foreach (string sql in SQLStringList)
{
if (!String.IsNullOrEmpty(sql))
{
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch (Exception E)
{
tx.Rollback();
throw new Exception(E.Message);
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
}
}
}
}
}
}