308 lines
15 KiB
C#
308 lines
15 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Data;
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using System.Collections;
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using System.Data.OleDb;
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using System.ComponentModel;
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using System.Windows.Forms;
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namespace CRVM.Utility
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{
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/// <summary>
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/// 用于操作DB2数据库的类
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/// </summary>
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public class DB2DBUtility
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{
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private static DB2DBUtility dbInstance;
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//public static string db2ConnectionString = "Provider=IBMDADB2.DB2COPY1;Data Source=COLD2010;User ID=prdb;Location=10.25.26.202;pwd=prdbprdb";
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public static string connectionString = "Provider=IBMDADB2;";
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//OleDbCommand cmd;
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//OleDbConnection conn;
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private DB2DBUtility()
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{
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connectionString =connectionString+ SettingConnectionString();
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}
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public static DB2DBUtility Instance
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{
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get
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{
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if (dbInstance == null)
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dbInstance = new DB2DBUtility();
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return dbInstance;
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}
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}
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/// <summary>
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/// Make connection string for open database
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/// </summary>
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/// <returns>connection string</returns>
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private string SettingConnectionString()
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{
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//string path = Application.StartupPath + "\\app\\form\\hmisetting.xml";
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string dataconn = "";
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//const string dataConf = "数据库配置";
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//EntityConfigItem database = ConfigHelper.GetInstance(path).GetConfigItemData(dataConf, "database");
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//EntityConfigItem userid = ConfigHelper.GetInstance(path).GetConfigItemData(dataConf, "userid");
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//EntityConfigItem password = ConfigHelper.GetInstance(path).GetConfigItemData(dataConf, "password");
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//EntityConfigItem ip = ConfigHelper.GetInstance(path).GetConfigItemData(dataConf, "ip");
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//dataconn = "Data Source=" + database.Values + ";User ID=" + userid.Values + ";Location=" + ip.Values + ";pwd=" + password.Values;
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return dataconn;
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}
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private Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
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/// <summary>
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/// Execute a database query which does not include a select
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/// </summary>
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/// <param name="connString">Connection string to database</param>
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/// <param name="cmdType">Command type either stored procedure or SQL</param>
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/// <param name="cmdText">Acutall SQL Command</param>
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/// <param name="commandParameters">Parameters to bind to the command</param>
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/// <returns></returns>
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public int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
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{
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// Create a new Oracle command
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OleDbCommand cmd = new OleDbCommand();
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//Create a connection
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using (OleDbConnection connection = new OleDbConnection(connectionString))
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{
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//Prepare the command
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PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
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//Execute the command
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int val = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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try
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{
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connection.Close();
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}
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catch
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{ }
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return val;
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}
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}
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/// <summary>
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/// Execute an OracleCommand (that returns no resultset) against an existing database 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(trans, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
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/// </remarks>
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/// <param name="trans">an existing database 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 PL/SQL command</param>
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/// <param name="commandParameters">an array of OracleParamters 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 int ExecuteNonQuery(OleDbTransaction trans, CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
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{
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OleDbCommand cmd = new OleDbCommand();
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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 an OracleCommand (that returns no resultset) against an existing database connection
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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 OracleParameter(":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 PL/SQL command</param>
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/// <param name="commandParameters">an array of OracleParamters 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 int ExecuteNonQuery(OleDbConnection connection, CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
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{
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try
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{
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OleDbCommand cmd = new OleDbCommand();
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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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catch
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{
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throw;
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}
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finally
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{
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connection.Close();
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}
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}
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/// <summary>
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/// Execute a select query that will return a result set
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/// </summary>
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/// <param name="connString">Connection string</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 PL/SQL command</param>
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/// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
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/// <returns></returns>
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public OleDbDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
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{
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OleDbCommand cmd = new OleDbCommand();
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//Create the command and connection
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OleDbConnection conn = new OleDbConnection(connectionString);
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try
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{
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//Prepare the command to execute
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PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
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// PrepareCommand(cmd, oraconn, null, cmdType, cmdText, commandParameters);
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//Execute the query, stating that the connection should close when the resulting datareader has been read
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OleDbDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
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//OracleDataReader rdr = cmd.ExecuteReader(); //xcs,2009-07-27
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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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{
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conn.Close();
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//If an error occurs close the connection as the reader will not be used and we expect it to close the connection
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throw;
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}
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}
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/// <summary>
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/// Execute an OracleCommand 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.
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/// </summary>
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/// <remarks>
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/// e.g.:
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/// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":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 PL/SQL command</param>
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/// <param name="commandParameters">an array of OracleParamters 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 object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
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{
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OleDbCommand cmd = new OleDbCommand();
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using (OleDbConnection conn = new OleDbConnection(connectionString))
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{
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PrepareCommand(cmd, conn, 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 OracleCommand (that returns a 1x1 resultset) against the specified SqlTransaction
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/// using the provided parameters.
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/// </summary>
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/// <param name="transaction">A valid SqlTransaction</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 PL/SQL command</param>
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/// <param name="commandParameters">An array of OracleParamters used to execute the command</param>
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/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
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public object ExecuteScalar(OleDbTransaction transaction, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
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{
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if (transaction == null)
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throw new ArgumentNullException("transaction");
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if (transaction != null && transaction.Connection == null)
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throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
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// Create a command and prepare it for execution
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OleDbCommand cmd = new OleDbCommand();
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PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
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// Execute the command & return the results
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object retval = cmd.ExecuteScalar();
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// Detach the SqlParameters from the command object, so they can be used again
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cmd.Parameters.Clear();
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return retval;
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}
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/// <summary>
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/// Execute an OracleCommand that returns the first column of the first record against an existing database connection
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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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/// Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":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 PL/SQL command</param>
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/// <param name="commandParameters">an array of OracleParamters 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 object ExecuteScalar(OleDbConnection connectionString, CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
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{
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try
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{
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OleDbCommand cmd = new OleDbCommand();
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PrepareCommand(cmd, connectionString, 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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catch
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{
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//If an error occurs close the connection as the reader will not be used and we expect it to close the connection
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throw;
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}
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finally
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{
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connectionString.Close();
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}
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}
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/// <summary>
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/// Add a set of parameters to the cached
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/// </summary>
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/// <param name="cacheKey">Key value to look up the parameters</param>
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/// <param name="commandParameters">Actual parameters to cached</param>
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public void CacheParameters(string cacheKey, params OleDbParameter[] commandParameters)
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{
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parmCache[cacheKey] = commandParameters;
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}
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public OleDbParameter[] GetCachedParameters(string cacheKey)
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{
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OleDbParameter[] cachedParms = (OleDbParameter[])parmCache[cacheKey];
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if (cachedParms == null)
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return null;
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// If the parameters are in the cache
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OleDbParameter[] clonedParms = new OleDbParameter[cachedParms.Length];
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// return a copy of the parameters
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for (int i = 0, j = cachedParms.Length; i < j; i++)
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clonedParms[i] = (OleDbParameter)((ICloneable)cachedParms[i]).Clone();
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return clonedParms;
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}
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/// <summary>
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/// Internal function to prepare a command for execution by the database
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/// </summary>
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/// <param name="cmd">Existing command object</param>
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/// <param name="conn">Database connection object</param>
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/// <param name="trans">Optional transaction object</param>
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/// <param name="cmdType">Command type, e.g. stored procedure</param>
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/// <param name="cmdText">Command test</param>
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/// <param name="commandParameters">Parameters for the command</param>
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private void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, CommandType cmdType, string cmdText, OleDbParameter[] commandParameters)
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{
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//Open the connection if required
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if (conn == null)
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conn = new OleDbConnection(connectionString);
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if (conn.State != ConnectionState.Open)
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conn.Open();
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//Set up the command
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cmd.Connection = conn;
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cmd.CommandText = cmdText;
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cmd.CommandType = cmdType;
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//Bind it to the transaction if it exists
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if (trans != null)
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cmd.Transaction = trans;
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// Bind the parameters passed in
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if (commandParameters != null)
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{
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foreach (OleDbParameter parm in commandParameters)
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cmd.Parameters.Add(parm);
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}
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}
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}
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}
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