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DbBase.cs
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DbBase.cs
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using System;
using System.Data.Common;
using System.Configuration;
using System.Data;
using System.Diagnostics;
using CYQ.Data.SQL;
using System.Collections.Generic;
using CYQ.Data.Tool;
using System.Threading;
using System.Data.SqlTypes;
namespace CYQ.Data
{
/// <summary>
/// 数据库操作基类
/// </summary>
internal abstract class DbBase : IDisposable
{
// private static MDictionary<string, bool> _dbOperator = new MDictionary<string, bool>();//数据库是否更新中
/// <summary>
/// 记录SQL语句信息
/// </summary>
internal System.Text.StringBuilder debugInfo = new System.Text.StringBuilder();
/// <summary>
/// 是否允许进入写日志中模块
/// </summary>
internal bool isAllowInterWriteLog = true;
// internal bool isErrorOnExeCommand;
internal int recordsAffected = 0;//执行命令时所受影响的行数（-2为发生异常）。
internal bool isWriteLog = false;//默认不启用，由AppSetting中配置控制，出现是为不用配置文件，内部手动控制启用。
internal bool isUseUnsafeModeOnSqlite = false;
internal bool isOpenTrans = false;
internal DalType dalType = DalType.MsSql;
private bool isAllowResetConn = true;//如果执行了非查询之后，为了数据的一致性，不允许切换到Slave数据库链接
internal string tempSql = string.Empty;//附加信息，包括调试信息
internal string conn = string.Empty;//原生态传进来的链接
internal string providerName = string.Empty;//传进来的名称
/// <summary>
/// 数据库链接实体（创建的时候被赋值）;
/// </summary>
internal ConnObject connObject;
internal IsolationLevel tranLevel = IsolationLevel.ReadCommitted;
protected DbProviderFactory _fac = null;
protected DbConnection _con = null;
protected DbCommand _com;
internal DbTransaction _tran;
private Stopwatch _watch;
/// <summary>
/// 获得链接的数据库名称
/// </summary>
public virtual string DataBase
{
get
{
if (!string.IsNullOrEmpty(_con.Database))
{
return _con.Database;
}
else
{
return System.IO.Path.GetFileNameWithoutExtension(_con.DataSource);
}
}
}
private string _Version = string.Empty;
/// <summary>
/// 数据库的版本号
/// </summary>
public string Version
{
get
{
if (string.IsNullOrEmpty(_Version))
{
switch (dalType)
{
case DalType.Txt:
_Version = "txt2.0";
break;
case DalType.Xml:
_Version = "xml2.0";
break;
default:
if (OpenCon(null))
{
_Version = _con.ServerVersion;
if (!isOpenTrans)//避免把事务给关闭了。
{
CloseCon();
}
}
break;
}
}
return _Version;
}
}
public DbConnection Con
{
get
{
return _con;
}
}
public DbCommand Com
{
get
{
return _com;
}
}
private bool _IsAllowRecordSql = true;
/// <summary>
/// 是否允许记录SQL语句 (内部操作会关掉此值为False）
/// </summary>
internal bool IsAllowRecordSql
{
get
{
return (AppConfig.Debug.OpenDebugInfo || AppConfig.Debug.SqlFilter > -1) && _IsAllowRecordSql;
}
set
{
_IsAllowRecordSql = value;
}
}
public DbBase(ConnObject co)
{
this.connObject = co;
this.conn = co.Master.Conn;
this.providerName = co.Master.ProviderName;
dalType = co.Master.ConnDalType;
_fac = GetFactory(providerName);
_con = _fac.CreateConnection();
_con.ConnectionString = DalCreate.FormatConn(dalType, conn);
_com = _con.CreateCommand();
if (_com != null)//Txt| Xml 时返回Null
{
_com.Connection = _con;
_com.CommandTimeout = AppConfig.DB.CommandTimeout;
}
if (IsAllowRecordSql)//开启秒表计算
{
_watch = new Stopwatch();
}
//if (AppConfig.DB.LockOnDbExe && dalType == DalType.Access)
//{
// string dbName = DataBase;
// if (!_dbOperator.ContainsKey(dbName))
// {
// try
// {
// _dbOperator.Add(dbName, false);
// }
// catch
// {
// }
// }
//}
//_com.CommandTimeout = 1;
}
protected virtual DbProviderFactory GetFactory(string providerName)
{
return DbProviderFactories.GetFactory(providerName);
}
#region 数据库链接切换相关逻辑
/// <summary>
/// 切换数据库（修改数据库链接）
/// </summary>
/// <param name="dbName"></param>
/// <returns></returns>
internal DbResetResult ChangeDatabase(string dbName)
{
if (_con.State == ConnectionState.Closed)//事务中。。不允许切换
{
try
{
if (IsExistsDbNameWithCache(dbName))//新的数据库不存在。。不允许切换
{
conn = GetNewConn(dbName);
_con.ConnectionString = DalCreate.FormatConn(dalType, conn);
connObject = DalCreate.GetConnObject(dbName + "Conn");
connObject.Master.Conn = conn;
return DbResetResult.Yes;
}
else
{
return DbResetResult.No_DBNoExists;
}
}
catch (Exception err)
{
Log.WriteLogToTxt(err);
}
}
return DbResetResult.No_Transationing;
}
//检测并切换数据库链接。
internal DbResetResult ChangeDatabaseWithCheck(string dbTableName)//----------
{
if (IsOwnerOtherDb(dbTableName))//数据库名称变化了。
{
string dbName = dbTableName.Split('.')[0];
return ChangeDatabase(dbName);
}
return DbResetResult.No_SaveDbName;
}
internal DbBase ResetDbBase(string dbTableName)
{
if (IsOwnerOtherDb(dbTableName))//是其它数据库名称。
{
string dbName = dbTableName.Split('.')[0];
if (_con.State != ConnectionState.Closed)//事务中。。创建新链接切换
{
return DalCreate.CreateDal(GetNewConn(dbName));
}
}
return this;
}
/// <summary>
/// 是否数据库名称变化了
/// </summary>
/// <param name="dbTableName"></param>
/// <returns></returns>
private bool IsOwnerOtherDb(string dbTableName)
{
int index = dbTableName.IndexOf('.');//DBName.TableName
if (index > 0 && !dbTableName.Contains(" ")) //排除视图语句
{
string dbName = dbTableName.Split('.')[0];
if (string.Compare(DataBase, dbName, StringComparison.OrdinalIgnoreCase) != 0 && conn.IndexOf(DataBase) == conn.LastIndexOf(DataBase))
{
return true;
}
}
return false;
}
protected string GetNewConn(string dbName)
{
string newConn = AppConfig.GetConn(dbName + "Conn");
if (!string.IsNullOrEmpty(newConn))
{
return newConn;
}
return conn.Replace(DataBase, dbName);
}
static MDictionary<string, bool> dbList = new MDictionary<string, bool>(3);
private bool IsExistsDbNameWithCache(string dbName)
{
try
{
string key = dalType.ToString() + "." + dbName;
if (dbList.ContainsKey(key))
{
return dbList[key];
}
bool result = IsExistsDbName(dbName);
dbList.Add(key, result);
return result;
}
catch
{
return true;
}
}
protected abstract bool IsExistsDbName(string dbName);
#endregion
private int returnValue = -1;
/// <summary>
/// 存储过程返回值。
/// </summary>
public int ReturnValue
{
get
{
if (returnValue == -1 && _com != null && _com.Parameters != null && _com.Parameters.Count > 0)
{
int.TryParse(Convert.ToString(_com.Parameters[_com.Parameters.Count - 1].Value), out returnValue);
}
return returnValue;
}
set
{
returnValue = value;
}
}
/// <summary>
/// 存储过程OutPut输出参数值。
/// 如果只有一个输出，则为值；
/// 如果有多个输出，则为Dictionary。
/// </summary>
public object OutPutValue
{
get
{
if (_com != null && _com.Parameters != null && _com.Parameters.Count > 0)
{
Dictionary<string, object> opValues = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
object outPutValue = null;
foreach (DbParameter para in _com.Parameters)
{
if (para.Direction == ParameterDirection.Output)
{
opValues.Add(para.ParameterName, para.Value);
outPutValue = para.Value;
}
}
if (opValues.Count < 2)
{
opValues = null;
return outPutValue;
}
return opValues;
}
return null;
}
}
public virtual char Pre
{
get
{
return '@';
}
}
#region 执行
/// <summary>
/// 并发操作检测
/// </summary>
/// <returns></returns>
//private bool CheckIsConcurrent()
//{
// int waitTimes = 500;//5秒
// while (_dbOperator.ContainsKey(DataBase) && _dbOperator[DataBase] && waitTimes > -1)
// {
// waitTimes--;
// System.Threading.Thread.Sleep(10);
// if (waitTimes == 0)
// {
// return true;
// }
// }
// return false;
//}
private DbDataReader ExeDataReaderSQL(string cmdText, bool isProc)
{
DbDataReader sdr = null;
ConnBean coSlave = null;
if (!isOpenTrans && _IsAllowRecordSql)
{
coSlave = connObject.GetSlave();
}
if (OpenCon(coSlave))
{
try
{
sdr = _com.ExecuteReader(isOpenTrans ? CommandBehavior.KeyInfo : CommandBehavior.CloseConnection | CommandBehavior.KeyInfo);
if (sdr != null)
{
recordsAffected = sdr.RecordsAffected;
}
}
catch (DbException err)
{
string msg = "ExeDataReader():" + err.Message;
debugInfo.Append(msg + AppConst.BR);
recordsAffected = -2;
WriteError(msg + (isProc ? "" : AppConst.BR + GetParaInfo(cmdText)));
}
//finally
//{
// if (coSlave != null)
// {
// ChangeConn(connObject.Master);//恢复链接。
// }
//}
}
return sdr;
}
public DbDataReader ExeDataReader(string cmdText, bool isProc)
{
SetCommandText(cmdText, isProc);
DbDataReader sdr = null;
//if (_dbOperator.ContainsKey(DataBase))
//{
// if (!CheckIsConcurrent())
// {
// // dbOperator[DataBase] = true;
// sdr = ExeDataReaderSQL(cmdText, isProc);
// // dbOperator[DataBase] = false;
// }
//}
//else
//{
sdr = ExeDataReaderSQL(cmdText, isProc);
//}
WriteTime();
return sdr;
}
private int ExeNonQuerySQL(string cmdText, bool isProc)
{
if (OpenCon())
{
try
{
if (isUseUnsafeModeOnSqlite && !isProc && dalType == DalType.SQLite && !isOpenTrans)
{
_com.CommandText = "PRAGMA synchronous=Off;" + _com.CommandText;
}
//rowCount = 1;
recordsAffected = _com.ExecuteNonQuery();
}
catch (DbException err)
{
string msg = "ExeNonQuery():" + err.Message;
debugInfo.Append(msg + AppConst.BR);
recordsAffected = -2;
WriteError(msg + (isProc ? "" : AppConst.BR + GetParaInfo(cmdText)));
}
finally
{
if (!isOpenTrans)
{
CloseCon();
}
}
}
return recordsAffected;
}
public int ExeNonQuery(string cmdText, bool isProc)
{
SetCommandText(cmdText, isProc);
int rowCount = 0;
//if (_dbOperator.ContainsKey(DataBase))
//{
// if (!CheckIsConcurrent())
// {
// _dbOperator[DataBase] = true;
// rowCount = ExeNonQuerySQL(cmdText, isProc);
// _dbOperator[DataBase] = false;
// }
//}
//else
//{
rowCount = ExeNonQuerySQL(cmdText, isProc);
//}
WriteTime();
return rowCount;
}
private object ExeScalarSQL(string cmdText, bool isProc)
{
object returnValue = null;
ConnBean coSlave = null;
//mssql 有 insert into ...select 操作。
if (!isOpenTrans && _IsAllowRecordSql && !cmdText.ToLower().TrimStart().StartsWith("insert "))
{
coSlave = connObject.GetSlave();
}
if (OpenCon(coSlave))
{
try
{
returnValue = _com.ExecuteScalar();
recordsAffected = returnValue == null ? 0 : 1;
}
catch (DbException err)
{
string msg = "ExeScalar():" + err.Message;
debugInfo.Append(msg + AppConst.BR);
recordsAffected = -2;
WriteError(msg + (isProc ? "" : AppConst.BR + GetParaInfo(cmdText)));
}
finally
{
if (!isOpenTrans)
{
CloseCon();
}
}
}
return returnValue;
}
public object ExeScalar(string cmdText, bool isProc)
{
SetCommandText(cmdText, isProc);
object returnValue = null;
//if (_dbOperator.ContainsKey(DataBase))
//{
// if (!CheckIsConcurrent())
// {
// returnValue = ExeScalarSQL(cmdText, isProc);
// }
//}
//else
//{
returnValue = ExeScalarSQL(cmdText, isProc);
//}
WriteTime();
return returnValue;
}
/*
private DataTable ExeDataTableSQL(string cmdText, bool isProc)
{
DbDataAdapter sdr = _fac.CreateDataAdapter();
sdr.SelectCommand = _com;
DataTable dataTable = null;
if (OpenCon())
{
try
{
dataTable = new DataTable();
recordsAffected = sdr.Fill(dataTable);
}
catch (DbException err)
{
recordsAffected = -2;
WriteError("ExeDataTable():" + err.Message + (isProc ? "" : AppConst.BR + GetParaInfo(cmdText)));
}
finally
{
sdr.Dispose();
if (!isOpenTrans)
{
CloseCon();
}
}
}
return dataTable;
}
public DataTable ExeDataTable(string cmdText, bool isProc)
{
SetCommandText(cmdText, isProc);
DataTable dataTable = null;
//if (_dbOperator.ContainsKey(DataBase))
//{
// if (!CheckIsConcurrent())
// {
// dataTable = ExeDataTableSQL(cmdText, isProc);
// }
//}
//else
//{
dataTable = ExeDataTableSQL(cmdText, isProc);
//}
WriteTime();
return dataTable;
}
*/
#endregion
public bool AddParameters(string parameterName, object value)
{
return AddParameters(parameterName, value, DbType.String, -1, ParameterDirection.Input);
}
public virtual bool AddParameters(string parameterName, object value, DbType dbType, int size, ParameterDirection direction)
{
if (dalType == DalType.Oracle)
{
parameterName = parameterName.Replace(":", "").Replace("@", "");
if (dbType == DbType.String && size > 4000)
{
AddCustomePara(parameterName, size == int.MaxValue ? ParaType.CLOB : ParaType.NCLOB, value, null);
return true;
}
}
else
{
parameterName = parameterName.Substring(0, 1) == Pre.ToString() ? parameterName : Pre + parameterName;
}
if (Com.Parameters.Contains(parameterName))//已经存在，不添加
{
return false;
}
DbParameter para = _fac.CreateParameter();
para.ParameterName = parameterName;
para.Value = value == null ? DBNull.Value : value;
if (dbType == DbType.Time)// && dalType != DalType.MySql
{
para.DbType = DbType.String;
}
else
{
if (dbType == DbType.DateTime && value != null)
{
string time = Convert.ToString(value);
if (dalType == DalType.MsSql && time == DateTime.MinValue.ToString())
{
para.Value = SqlDateTime.MinValue;
}
else if (dalType == DalType.MySql && (time == SqlDateTime.MinValue.ToString() || time == DateTime.MinValue.ToString()))
{
para.Value = DateTime.MinValue;
}
}
para.DbType = dbType;
}
if (dbType == DbType.Binary && dalType == DalType.MySql)//mysql不能设定长度，否则会报索引超出了数组界限错误。
{
para.Size = -1;
}
else if (dbType != DbType.Binary && size > -1)
{
if (size != para.Size)
{
para.Size = size;
}
}
para.Direction = direction;
Com.Parameters.Add(para);
return true;
}
internal virtual void AddCustomePara(string paraName, ParaType paraType, object value, string typeName)
{
}
//internal virtual void AddCustomePara(string paraName, ParaType paraType, object value)
//{
//}
//public abstract DbParameter GetNewParameter();
public void ClearParameters()
{
if (_com != null && _com.Parameters != null)
{
_com.Parameters.Clear();
}
}
public abstract void AddReturnPara();
private void SetCommandText(string commandText, bool isProc)
{
_com.CommandText = isProc ? commandText : SqlFormat.Compatible(commandText, dalType, false);
if (!isProc && dalType == DalType.SQLite && _com.CommandText.Contains("charindex"))
{
_com.CommandText += " COLLATE NOCASE";//忽略大小写
}
_com.CommandType = isProc ? CommandType.StoredProcedure : CommandType.Text;
if (isProc)
{
if (commandText.Contains("SelectBase") && !_com.Parameters.Contains("ReturnValue"))
{
AddReturnPara();
//检测是否存在分页存储过程，若不存在，则创建。
Tool.DBTool.CreateSelectBaseProc(dalType, conn);//内部分检测是否已创建过。
}
}
else
{
//取消多余的参数，新加的小贴心，过滤掉用户不小心写多的参数。
if (_com != null && _com.Parameters != null && _com.Parameters.Count > 0)
{
bool needToReplace = (dalType == DalType.Oracle || dalType == DalType.MySql) && _com.CommandText.Contains("@");
string paraName;
for (int i = 0; i < _com.Parameters.Count; i++)
{
paraName = _com.Parameters[i].ParameterName.TrimStart(Pre);//默认自带前缀的，取消再判断
if (needToReplace && _com.CommandText.IndexOf("@" + paraName) > -1)
{
//兼容多数据库的参数（虽然提供了=:?"为兼容语法，但还是贴心的再处理一下）
switch (dalType)
{
case DalType.Oracle:
case DalType.MySql:
_com.CommandText = _com.CommandText.Replace("@" + paraName, Pre + paraName);
break;
}
}
if (_com.CommandText.IndexOf(Pre + paraName, StringComparison.OrdinalIgnoreCase) == -1)
{
_com.Parameters.RemoveAt(i);
i--;
}
}
}
}
//else
//{
// string checkText = commandText.ToLower();
// //int index=
// //if (checkText.IndexOf("table") > -1 && (checkText.IndexOf("delete") > -1 || checkText.IndexOf("drop") > -1 || checkText.IndexOf("truncate") > -1))
// //{
// // Log.WriteLog(commandText);
// //}
//}
if (IsAllowRecordSql)
{
tempSql = GetParaInfo(_com.CommandText) + AppConst.BR + "execute time is: ";
}
}
private string GetParaInfo(string commandText)
{
string paraInfo = dalType + "." + DataBase + ".SQL: " + AppConst.BR + commandText;
foreach (DbParameter item in _com.Parameters)
{
paraInfo += AppConst.BR + "Para: " + item.ParameterName + "-> " + (item.Value == DBNull.Value ? "DBNull.Value" : item.Value);
}
return paraInfo;
}
/// <summary>
/// 记录执行时间
/// </summary>
private void WriteTime()
{
if (IsAllowRecordSql && _watch != null)
{
_watch.Stop();
double ms = _watch.Elapsed.TotalMilliseconds;
tempSql += ms + " (ms)" + AppConst.HR;
if (AppConfig.Debug.OpenDebugInfo)
{
debugInfo.Append(tempSql);
if (AppDebug.IsRecording && ms >= AppConfig.Debug.InfoFilter)
{
AppDebug.Add(tempSql);
}
}
if (AppConfig.Debug.SqlFilter >= 0 && ms >= AppConfig.Debug.SqlFilter)
{
Log.WriteLogToTxt(tempSql, "SqlFilter_");
}
_watch.Reset();
tempSql = null;
}
}
#region IDisposable 成员
public void Dispose()
{
if (_con != null)
{
CloseCon();
_con = null;
}
if (_com != null)
{
_com = null;
}
if (_watch != null)
{
_watch = null;
}
}
internal bool TestConn()
{
Thread thread = new Thread(TestOpen);
thread.IsBackground = true;
thread.Priority = ThreadPriority.Highest;
thread.Start();
int sleepTimes = 0;
while (!isOpenOK)
{
sleepTimes += 30;
if (sleepTimes > 3000)
{
thread.Abort();
break;
}
Thread.Sleep(30);
}
return isOpenOK;
}
private bool isOpenOK;
private void TestOpen()
{
try
{
if (_con.State == ConnectionState.Closed)
{
_con.Open();
_Version = _con.ServerVersion;//顺带设置版本号。
_con.Close();
}
isOpenOK = true;
}
catch (Exception err)
{
isOpenOK = false;
debugInfo.Append(err.Message);
}
}
internal bool OpenCon()
{
bool result = OpenCon(connObject.Master);
if (_IsAllowRecordSql)
{
connObject.SetNotAllowSlave();
isAllowResetConn = false;
}
return result;
}
/// <summary>
/// 切换链接
/// </summary>
/// <param name="cb"></param>
private void ResetConn(ConnBean cb)
{
if (_con != null && _con.State != ConnectionState.Open && conn != cb.Conn && _IsAllowRecordSql)
{
conn = cb.Conn;//切换。
_con.ConnectionString = DalCreate.FormatConn(dalType, conn);
}
}
internal bool OpenCon(ConnBean cb)
{
try
{
if (!isOpenTrans && cb != null && isAllowResetConn && connObject.IsAllowSlave())
{
ResetConn(cb);
}
Open();
if (IsAllowRecordSql)
{
_watch.Start();
}
return true;
}
catch (DbException err)
{
if (cb == null && connObject.BackUp != null)
{
connObject.InterChange();
return OpenCon(connObject.BackUp);
//if (OpenConBak())
//{
// return true;
//}
}
else
{
WriteError("OpenCon():" + err.Message);
}
}
return false;
}
private void Open()
{
if (_con.State == ConnectionState.Closed)
{
if (dalType == DalType.Sybase)
{
_com.Connection = _con;//重新赋值（Sybase每次Close后命令的Con都丢失）
}
_con.Open();
}
if (isOpenTrans)
{
if (_tran == null)
{
_tran = _con.BeginTransaction(tranLevel);
_com.Transaction = _tran;
}
else if (_tran.Connection == null)
{
//ADO.NET Bug：在 guid='123' 时不抛异常，但自动关闭链接，不关闭对象，会引发后续的业务不在事务中。
Dispose();
Error.Throw("Transation：Last execute command has syntax error：" + debugInfo.ToString());
}
}
}
/*
private bool OpenConBak()
{
try
{
if (connObject.ProviderName == connObject.ProviderNameBak)//同种数据库链接。
{
conn = connObject.ConnBak;//切换到备用。
_con.ConnectionString = conn;//切换到备用。
Open();
//交换主从链接
connObject.ExchangeConn();
if (IsAllowRecordSql)
{
_watch.Start();
}
return true;
}
else
{
connObject.ExchangeConn();//不同种，切换链接后，本次操作直接抛异常
}
}
catch (DbException err)
{
WriteError("OpenConBak():" + err.Message);
}
return false;
}
*/
internal void CloseCon()
{
try
{
if (_con.State != ConnectionState.Closed)
{
if (_tran != null)
{
isOpenTrans = false;
if (_tran.Connection != null)
{
_tran.Commit();
}
_tran = null;
}
_con.Close();
}
}
catch (DbException err)
{
WriteError("CloseCon():" + err.Message);
}
}
public bool EndTransaction()
{
isOpenTrans = false;
if (_tran != null)
{
try
{
if (_tran.Connection == null)
{
return false;//上一个执行语句发生了异常（特殊情况在ExeReader guid='xxx' 但不抛异常)
}
_tran.Commit();
}
catch (Exception err)
{
RollBack();
WriteError("EndTransaction():" + err.Message);
return false;
}
finally
{
_tran = null;
CloseCon();
}
}
return true;
}
/// <summary>
/// 事务（有则）回滚
/// </summary>
/// <returns></returns>
public bool RollBack()
{
if (_tran != null)
{
try
{
if (_tran.Connection != null)
{
_tran.Rollback();
}
}
catch (Exception)
{
return false;
}
finally
{
_tran = null;//以便重启事务，避免无法二次回滚。
}
}
return true;
}
internal delegate void OnException(string msg);
internal event OnException OnExceptionEvent;
internal bool IsOnExceptionEventNull
{
get
{
return OnExceptionEvent == null;
}