.NET/C#/Oracle数据库操作类实例代码，.net
.NET/C#/Oracle数据库操作类实例代码
using System;
using System.Data;
using System.Collections.Generic;
using System.Configuration;
using System.Data.OracleClient;
using System.Text;
using System.IO;
/// <summary>
/// Oracle数据库操作类
/// </summary>
internal static class OracleHelper
{
//数据库连接字符串
private readonly static string connstr = ConfigurationManager.ConnectionStrings["ConnectionStrings"].ConnectionString;
/// <summary>
/// 执行数据库查询操作,返回受影响的行数
/// </summary>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前查询操作影响的数据行数</returns>
internal static int ExecuteNonQuery(string cmdText, params OracleParameter[] commandParameters)
{
OracleCommand command = new OracleCommand();
OracleConnection connection = new OracleConnection(connstr);
int result = 0;
try
{
PrepareCommand(command, connection, null,CommandType.Text, cmdText, commandParameters);
result = command.ExecuteNonQuery();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库事务查询操作,返回受影响的行数
/// </summary>
/// <param name="transaction">数据库事务对象</param>
/// <param name="cmdType">Command类型</param>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前事务查询操作影响的数据行数</returns>
internal static int ExecuteNonQuery(OracleTransaction transaction, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
OracleCommand command = new OracleCommand();
OracleConnection connection = transaction.Connection;
int result = 0;
try
{
PrepareCommand(command, connection, transaction, cmdType, cmdText, commandParameters);
result = command.ExecuteNonQuery();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
transaction.Dispose();
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库查询操作,返回受影响的行数
/// </summary>
/// <param name="connection">Oracle数据库连接对象</param>
/// <param name="cmdType">Command类型</param>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前查询操作影响的数据行数</returns>
internal static int ExecuteNonQuery(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
if (connection == null) throw new ArgumentNullException("当前数据库连接不存在");
OracleCommand command = new OracleCommand();
int result = 0;
try
{
PrepareCommand(command, connection, null, cmdType, cmdText, commandParameters);
result = command.ExecuteNonQuery();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库查询操作,返回OracleDataReader类型的内存结果集
/// </summary>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前查询操作返回的OracleDataReader类型的内存结果集</returns>
internal static OracleDataReader ExecuteReader(string cmdText, params OracleParameter[] commandParameters)
{
OracleCommand command = new OracleCommand();
OracleConnection connection = new OracleConnection(connstr);
OracleDataReader reader = null;
try
{
PrepareCommand(command, connection, null,CommandType.Text, cmdText, commandParameters);
reader = command.ExecuteReader(CommandBehavior.CloseConnection);
command.Parameters.Clear();
return reader;
}
catch
{
command.Dispose();
connection.Close();
throw;
}
}
/// <summary>
/// 执行数据库查询操作,返回DataSet类型的结果集
/// </summary>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前查询操作返回的DataSet类型的结果集</returns>
internal static DataSet ExecuteDataSet(string cmdText, params OracleParameter[] commandParameters)
{
OracleCommand command = new OracleCommand();
OracleConnection connection = new OracleConnection(connstr);
DataSet dataset = null;
try
{
PrepareCommand(command, connection, null,CommandType.Text, cmdText, commandParameters);
OracleDataAdapter adapter = new OracleDataAdapter();
adapter.SelectCommand = command;
dataset = new DataSet();
adapter.Fill(dataset);
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
return dataset;
}
/// <summary>
/// 执行数据库查询操作,返回DataTable类型的结果集
/// </summary>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前查询操作返回的DataTable类型的结果集</returns>
internal static DataTable ExecuteDataTable(string cmdText, params OracleParameter[] commandParameters)
{
OracleCommand command = new OracleCommand();
OracleConnection connection = new OracleConnection(connstr);
DataTable table = null;
try
{
PrepareCommand(command, connection, null,CommandType.Text, cmdText, commandParameters);
OracleDataAdapter adapter = new OracleDataAdapter();
adapter.SelectCommand = command;
table = new DataTable();
adapter.Fill(table);
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
return table;
}
/// <summary>
/// 执行数据库查询操作,返回结果集中位于第一行第一列的Object类型的值
/// </summary>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前查询操作返回的结果集中位于第一行第一列的Object类型的值</returns>
internal static object ExecuteScalar(string cmdText, params OracleParameter[] commandParameters)
{
OracleCommand command = new OracleCommand();
OracleConnection connection = new OracleConnection(connstr);
object result = null;
try
{
PrepareCommand(command, connection, null,CommandType.Text, cmdText, commandParameters);
result = command.ExecuteScalar();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库事务查询操作,返回结果集中位于第一行第一列的Object类型的值
/// </summary>
/// <param name="transaction">一个已存在的数据库事务对象</param>
/// <param name="commandType">命令类型</param>
/// <param name="commandText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前事务查询操作返回的结果集中位于第一行第一列的Object类型的值</returns>
internal static object ExecuteScalar(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
{
if (transaction == null) throw new ArgumentNullException("当前数据库事务不存在");
OracleConnection connection = transaction.Connection;
if (connection == null) throw new ArgumentException("当前事务所在的数据库连接不存在");
OracleCommand command = new OracleCommand();
object result = null;
try
{
PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters);
result = command.ExecuteScalar();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
transaction.Dispose();
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库查询操作,返回结果集中位于第一行第一列的Object类型的值
/// </summary>
/// <param name="connection">数据库连接对象</param>
/// <param name="cmdType">Command类型</param>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
/// <returns>当前查询操作返回的结果集中位于第一行第一列的Object类型的值</returns>
internal static object ExecuteScalar(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
{
if (connection == null) throw new ArgumentException("当前数据库连接不存在");
OracleCommand command = new OracleCommand();
object result = null;
try
{
PrepareCommand(command, connection, null, cmdType, cmdText, commandParameters);
result = command.ExecuteScalar();
command.Parameters.Clear();
}
catch
{
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
return result;
}
/// <summary>
/// 执行数据库命令前的准备工作
/// </summary>
/// <param name="command">Command对象</param>
/// <param name="connection">数据库连接对象</param>
/// <param name="trans">事务对象</param>
/// <param name="cmdType">Command类型</param>
/// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
/// <param name="commandParameters">命令参数集合</param>
private static void PrepareCommand(OracleCommand command, OracleConnection connection, OracleTransaction trans, CommandType cmdType, string cmdText, OracleParameter[] commandParameters)
{
if (connection.State != ConnectionState.Open) connection.Open();
command.Connection = connection;
command.CommandText = cmdText;
command.CommandType = cmdType;
if (trans != null) command.Transaction = trans;
if (commandParameters != null)
{
foreach (OracleParameter parm in commandParameters)
command.Parameters.Add(parm);
}
}
/// <summary>
/// 将.NET日期时间类型转化为Oracle兼容的日期时间格式字符串
/// </summary>
/// <param name="date">.NET日期时间类型对象</param>
/// <returns>Oracle兼容的日期时间格式字符串（如该字符串：TO_DATE('2007-12-1','YYYY-MM-DD')）</returns>
internal static string GetOracleDateFormat(DateTime date)
{
return "TO_DATE('" + date.ToString("yyyy-M-dd") + "','YYYY-MM-DD')";
}
/// <summary>
/// 将.NET日期时间类型转化为Oracle兼容的日期格式字符串
/// </summary>
/// <param name="date">.NET日期时间类型对象</param>
/// <param name="format">Oracle日期时间类型格式化限定符</param>
/// <returns>Oracle兼容的日期时间格式字符串（如该字符串：TO_DATE('2007-12-1','YYYY-MM-DD')）</returns>
internal static string GetOracleDateFormat(DateTime date, string format)
{
if (format == null || format.Trim() == "") format = "YYYY-MM-DD";
return "TO_DATE('" + date.ToString("yyyy-M-dd") + "','" + format + "')";
}
/// <summary>
/// 将指定的关键字处理为模糊查询时的合法参数值
/// </summary>
/// <param name="source">待处理的查询关键字</param>
/// <returns>过滤后的查询关键字</returns>
internal static string HandleLikeKey(string source)
{
if (source == null || source.Trim() == "") return null;
source = source.Replace("[", "[]]");
source = source.Replace("_", "[_]");
source = source.Replace("%", "[%]");
return ("%" + source + "%");
}
/// <summary>
/// 将文本内容写入到数据库的CLOB字段中（不可用：报连接被关闭的异常）
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="table">数据库表名称</param>
/// <param name="where">指定的WHERE条件语句</param>
/// <param name="clobField">CLOB字段的名称</param>
/// <param name="content">要写入的文本内容</param>
internal static void WriteCLOB(string table, string where, string clobField, string content)
{
if (String.IsNullOrEmpty(connstr) || String.IsNullOrEmpty(table) || String.IsNullOrEmpty(clobField)) return;
using (OracleConnection connection = new OracleConnection(connstr))
{
OracleCommand command = null;
try
{
connection.Open();
command = connection.CreateCommand();
command.CommandText = "SELECT " + clobField + " FROM " + table + " WHERE " + where + " FOR UPDATE";
OracleDataReader reader = command.ExecuteReader();
if (reader != null && reader.HasRows)
{
reader.Read();
command.Transaction = command.Connection.BeginTransaction();
OracleLob lob = reader.GetOracleLob(0);
byte[] buffer = Encoding.Unicode.GetBytes(content);
if (lob != OracleLob.Null) lob.Erase();
lob.Write(buffer, 0, ((buffer.Length % 2 == 0) ? buffer.Length : (buffer.Length - 1)));
command.Transaction.Commit();
reader.Close();
}
}
catch
{
command.Transaction.Rollback();
throw;
}
finally
{
command.Dispose();
connection.Close();
connection.Dispose();
}
}
}
/// <summary>
/// 从数据库中读取CLOB字段的内容并进行输出
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="table">数据库表名称</param>
/// <param name="where">指定的WHERE条件语句</param>
/// <param name="clobField">CLOB字段的名称</param>
/// <param name="output">保存内容输出的字符串变量</param>
internal static void ReadCLOB(string connectionString, string table, string where, string clobField, ref string output)
{
if (String.IsNullOrEmpty(connectionString) || String.IsNullOrEmpty(table) || String.IsNullOrEmpty(clobField)) return;
using (OracleConnection connection = new OracleConnection(connectionString))
{
OracleCommand command = null;
StreamReader stream = null;
try
{
connection.Open();
command = connection.CreateCommand();
command.CommandText = "SELECT " + clobField + " FROM " + table + " WHERE " + where;
OracleDataReader reader = command.ExecuteReader();
if (reader != null && reader.HasRows)
{
reader.Read();
command.Transaction = command.Connection.BeginTransaction();
OracleLob lob = reader.GetOracleLob(0);
if (lob != OracleLob.Null)
{
stream = new StreamReader(lob, Encoding.Unicode);
output = stream.ReadToEnd().Trim();
command.Transaction.Commit();
reader.Close();
}
}
}
catch
{
command.Transaction.Rollback();
throw;
}
finally
{
stream.Close();
command.Dispose();
connection.Close();
connection.Dispose();
}
}
}
}
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