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DalBase.cs
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DalBase.cs
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using System;
using System.Data.Common;
using System.Data;
using System.Diagnostics;
using CYQ.Data.SQL;
using System.Collections.Generic;
using CYQ.Data.Tool;
using System.Data.SqlTypes;
using System.Threading;
namespace CYQ.Data
{
/// <summary>
/// 数据库操作基类 （模板模式：Template Method）
/// 属性管理
/// </summary>
internal abstract partial class DalBase : IDisposable
{
#region 对外公开的属性
/// <summary>
/// 记录SQL语句信息
/// </summary>
public System.Text.StringBuilder DebugInfo = new System.Text.StringBuilder();
/// <summary>
/// 执行命令时所受影响的行数（-2为发生异常）。
/// </summary>
public int RecordsAffected = 0;
/// <summary>
/// 当前是否开启事务
/// </summary>
public bool IsOpenTrans = false;
/// <summary>
/// 原生态传进来的配置名（或链接）
/// </summary>
public string ConnName
{
get
{
return !ConnObj.Master.IsBackup ? ConnObj.Master.ConnName : ConnObj.BackUp.ConnName;
}
}
/// <summary>
/// 数据库主从备链接管理对象;
/// </summary>
public ConnObject ConnObj;
/// <summary>
/// 当前使用中的链接对象
/// </summary>
public ConnBean UsingConnBean;
/// <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 if (DataBaseType == DalType.Oracle)
{
// (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT = 1521)))(CONNECT_DATA =(Sid = Aries)))
int i = _con.DataSource.LastIndexOf('=') + 1;
return _con.DataSource.Substring(i).Trim(' ', ')');
}
else
{
return System.IO.Path.GetFileNameWithoutExtension(_con.DataSource);
}
}
}
private static MDictionary<string, string> _VersionCache = new MDictionary<string, string>();
private string _Version = string.Empty;
/// <summary>
/// 数据库的版本号
/// </summary>
public string Version
{
get
{
if (string.IsNullOrEmpty(_Version))
{
switch (DataBaseType)
{
case DalType.Txt:
_Version = "txt2.0";
break;
case DalType.Xml:
_Version = "xml2.0";
break;
default:
if (_VersionCache.ContainsKey(ConnName))
{
_Version = _VersionCache[ConnName];
}
else
{
if (IsOpenTrans && UsingConnBean.IsSlave)// && 事务操作时，如果在从库，切回主库
{
ResetConn(ConnObj.Master);
}
if (OpenCon(UsingConnBean, AllowConnLevel.MaterBackupSlave))//这里可能切换链接
{
_Version = _con.ServerVersion;
if (!_VersionCache.ContainsKey(ConnName))
{
_VersionCache.Set(ConnName, _Version);
}
if (!IsOpenTrans)//避免把事务给关闭了。
{
CloseCon();
}
}
}
break;
}
}
return _Version;
}
}
/// <summary>
/// 当前操作的数据库类型
/// </summary>
public DalType DataBaseType
{
get
{
return ConnObj.Master.ConnDalType;
}
}
#endregion
/// <summary>
/// 是否允许进入写日志中模块(默认true)
/// </summary>
public bool IsWriteLogOnError = true;
protected bool isUseUnsafeModeOnSqlite = false;
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
private string tempSql = string.Empty;//附加信息，包括调试信息
private IsolationLevel _TranLevel = IsolationLevel.ReadCommitted;
internal IsolationLevel TranLevel
{
get
{
if (_tran != null && _com != null && _com.Transaction != null)
{
return _com.Transaction.IsolationLevel;
}
return _TranLevel;
}
set
{
if (_tran != null && _com != null && _com.Transaction != null)
{
Error.Throw("IsolationLevel is readonly when transaction is begining!");
}
else
{
_TranLevel = value;
}
}
}
protected DbProviderFactory _fac = null;
protected DbConnection _con = null;
protected DbCommand _com;
internal DbTransaction _tran;
private Stopwatch _watch;
public DbConnection Con
{
get
{
return _con;
}
}
public DbCommand Com
{
get
{
return _com;
}
}
private bool _IsRecordDebugInfo = true;
/// <summary>
/// 是否允许记录SQL语句 (内部操作会关掉此值为False）
/// </summary>
public bool IsRecordDebugInfo
{
get
{
return (AppConfig.Debug.OpenDebugInfo || AppConfig.Debug.SqlFilter > -1) && _IsRecordDebugInfo;
}
set
{
_IsRecordDebugInfo = value;
}
}
public DalBase(ConnObject co)
{
this.ConnObj = co;
this.UsingConnBean = co.Master;
_fac = GetFactory();
_con = _fac.CreateConnection();
try
{
_con.ConnectionString = co.Master.ConnString;
}
catch (Exception err)
{
Error.Throw("check the connectionstring is be ok!" + AppConst.BR + "error:" + err.Message + AppConst.BR + ConnName);
}
_com = _con.CreateCommand();
if (_com != null)//Txt| Xml 时返回Null
{
_com.Connection = _con;
_com.CommandTimeout = AppConfig.DB.CommandTimeout;
}
if (IsRecordDebugInfo)//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 abstract DbProviderFactory GetFactory();
#region 拿表、视图、存储过程等元数据。
public virtual Dictionary<string, string> GetTables()
{
return GetSchemaDic(GetSchemaSql("U"));
}
public virtual Dictionary<string, string> GetViews()
{
return GetSchemaDic(GetSchemaSql("V"));
}
public virtual Dictionary<string, string> GetProcs()
{
return GetSchemaDic(GetSchemaSql("P"));
}
protected Dictionary<string, string> GetSchemaDic(string sql)
{
if (string.IsNullOrEmpty(sql))
{
return null;
}
Dictionary<string, string> dic = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
DbDataReader sdr = ExeDataReader(sql, false);
if (sdr != null)
{
string tableName = string.Empty;
while (sdr.Read())
{
tableName = Convert.ToString(sdr["TableName"]);
if (!dic.ContainsKey(tableName))
{
dic.Add(tableName, Convert.ToString(sdr["Description"]));
}
}
sdr.Close();
sdr = null;
}
return dic;
}
protected virtual string GetSchemaSql(string type)
{
return "";
}
#endregion
#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>
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
{
string newConnString = GetConnString(dbName);
_con.ConnectionString = newConnString;
ConnObj = ConnObject.Create(dbName + "Conn");
ConnObj.Master.ConnName = dbName + "Conn";
ConnObj.Master.ConnString = newConnString;
return DBResetResult.Yes;
}
else
{
return DBResetResult.No_DBNoExists;
}
}
catch (Exception err)
{
Log.Write(err, LogType.DataBase);
}
}
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 DalBase ResetDalBase(string dbTableName)
{
if (IsOwnerOtherDb(dbTableName))//是其它数据库名称。
{
if (_con.State != ConnectionState.Closed)//事务中。。创建新链接切换
{
string dbName = dbTableName.Split('.')[0];
return DalCreate.CreateDal(GetConnString(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 && ConnName.IndexOf(DataBase) == ConnName.LastIndexOf(DataBase))
{
return true;
}
}
return false;
}
protected string GetConnString(string dbName)
{
string newConn = AppConfig.GetConn(dbName + "Conn");
if (!string.IsNullOrEmpty(newConn))
{
return ConnBean.Create(newConn).ConnString;
}
return UsingConnBean.ConnString.Replace(DataBase, dbName);
}
static MDictionary<string, bool> dbList = new MDictionary<string, bool>(3);
private bool IsExistsDbNameWithCache(string dbName)
{
try
{
string key = DataBaseType.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)
{
for (int i = _com.Parameters.Count - 1; i >= 0; i--)
{
if (_com.Parameters[i].Direction == ParameterDirection.ReturnValue)
{
int.TryParse(Convert.ToString(_com.Parameters[i].Value), out returnValue);
break;
}
}
}
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 参数化管理
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 (DataBaseType == 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 (DataBaseType == DalType.MsSql && time == DateTime.MinValue.ToString())
{
para.Value = SqlDateTime.MinValue;
}
else if (DataBaseType == DalType.MySql && (time == SqlDateTime.MinValue.ToString() || time == DateTime.MinValue.ToString()))
{
para.Value = DateTime.MinValue;
}
}
para.DbType = dbType;
}
if (dbType == DbType.Binary && DataBaseType == DalType.MySql)//（mysql不能设定长度，否则会报索引超出了数组界限错误【已过时，旧版本的MySql.Data.dll不能指定长度】）。
{
if (value != null)
{
byte[] bytes = value as byte[];
para.Size = bytes.Length;//新版本的MySql.Data.dll 修正了长度指定（不指定就没数据进去），所以又要指定长度，Shit
}
else
{
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)
{
switch (paraType)
{
case ParaType.OutPut:
AddParameters(paraName, null, DbType.String, 2000, ParameterDirection.Output);
break;
case ParaType.InputOutput:
AddParameters(paraName, null, DbType.String, 2000, ParameterDirection.InputOutput);
break;
case ParaType.ReturnValue:
AddParameters(paraName, null, DbType.Int32, 32, ParameterDirection.ReturnValue);
break;
}
}
//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();
}
}
/// <summary>
/// 处理内置的MSSQL和Oracle两种存储过程分页
/// </summary>
protected virtual void AddReturnPara() { }
private void SetCommandText(string commandText, bool isProc)
{
if (OracleDal.clientType > 0)
{
Type t = _com.GetType();
System.Reflection.PropertyInfo pi = t.GetProperty("BindByName");
if (pi != null)
{
pi.SetValue(_com, true, null);
}
}
_com.CommandText = isProc ? commandText : SqlFormat.Compatible(commandText, DataBaseType, false);
if (!isProc && DataBaseType == DalType.SQLite && _com.CommandText.Contains("charindex"))
{
_com.CommandText += " COLLATE NOCASE";//忽略大小写
}
//else if (isProc && dalType == DalType.MySql)
//{
// _com.CommandText = "Call " + _com.CommandText;
//}
_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(DataBaseType, ConnName);//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 = (DataBaseType == DalType.Oracle || DataBaseType == 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 (DataBaseType)
{
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 (IsRecordDebugInfo)
{
tempSql = GetParaInfo(_com.CommandText) + AppConst.BR + "execute time is: ";
}
}
#endregion
#region 调试信息管理
private string GetParaInfo(string commandText)
{
string paraInfo = DataBaseType + "." + 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 (IsRecordDebugInfo && _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.Write(tempSql, LogType.Debug);
}
_watch.Reset();
tempSql = null;
}
}
#endregion
#region 事务管理
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;
}
#endregion
#region 异常处理
internal delegate void OnException(string msg);
internal event OnException OnExceptionEvent;
internal bool IsOnExceptionEventNull
{
get
{
return OnExceptionEvent == null;
}
}
/// <summary>
/// 输出错误（若事务中，回滚事务）
/// </summary>
/// <param name="err"></param>
internal void WriteError(string err)
{
err = DataBaseType + " Call Function::" + err;
if (_watch != null && _watch.IsRunning)
{
_watch.Stop();
_watch.Reset();
}
RollBack();
if (IsWriteLogOnError)
{
Log.Write(err + AppConst.BR + DebugInfo, LogType.DataBase);
}
if (OnExceptionEvent != null)
{
try
{
OnExceptionEvent(err);
}
catch
{
}
}
if (IsOpenTrans)
{
Dispose();//事务中发生语句语法错误，直接关掉资源，避免因后续代码继续执行。
}
}
#endregion
public void Dispose()
{
if (_con != null)
{
CloseCon();
_con = null;
}
if (_com != null)
{
_com = null;
}
if (_watch != null)
{
_watch = null;
}
}
}
/// <summary>
/// 执行管理
/// </summary>
internal abstract partial class DalBase
{
private DbDataReader ExeDataReaderSQL(string cmdText, bool isProc)
{
DbDataReader sdr = null;
ConnBean coSlave = null;
if (!IsOpenTrans)// && _IsAllowRecordSql
{
coSlave = ConnObj.GetSlave();
}
else if (UsingConnBean.IsSlave)// && 事务操作时，如果在从库，切回主库
{
ResetConn(ConnObj.Master);
}
if (OpenCon(coSlave, AllowConnLevel.MaterBackupSlave))
{
try
{
CommandBehavior cb = CommandBehavior.CloseConnection;
if (_IsRecordDebugInfo)//外部SQL，带表结构返回
{
cb = IsOpenTrans ? CommandBehavior.KeyInfo : CommandBehavior.CloseConnection | CommandBehavior.KeyInfo;
}
else if (IsOpenTrans)
{
cb = CommandBehavior.Default;//避免事务时第一次拿表结构链接被关闭。
}
sdr = _com.ExecuteReader(cb);
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)
{
RecordsAffected = -2;
if (IsOpenTrans && UsingConnBean.IsSlave)// && 事务操作时，如果在从库，切回主库
{
ResetConn(ConnObj.Master);
}
if (OpenCon())//这里也会切库了，同时设置了10秒切到主库。
{
try
{
if (UsingConnBean.ConnString != ConnObj.Master.ConnString)
{
// recordsAffected = -2;//从库不允许执行非查询操作。
string msg = "You can't do ExeNonQuerySQL() on Slave DataBase!";
DebugInfo.Append(msg + AppConst.BR);
WriteError(msg + (isProc ? "" : AppConst.BR + GetParaInfo(cmdText)));
}
else
{
if (isUseUnsafeModeOnSqlite && !isProc && DataBaseType == DalType.SQLite && !IsOpenTrans)
{
_com.CommandText = "PRAGMA synchronous=Off;" + _com.CommandText;
}
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。
bool isSelectSql = !IsOpenTrans && !cmdText.ToLower().TrimStart().StartsWith("insert ");//&& _IsAllowRecordSql
bool isOpenOK;
if (isSelectSql)
{
coSlave = ConnObj.GetSlave();
isOpenOK = OpenCon(coSlave, AllowConnLevel.MaterBackupSlave);
}
else
{
if (UsingConnBean.IsSlave) // 如果是在从库，切回主库。(insert ...select 操作)
{
ResetConn(ConnObj.Master);
}
isOpenOK = OpenCon();
}
if (isOpenOK)
{
try
{
if (!isSelectSql && UsingConnBean.ConnString != ConnObj.Master.ConnString)
{
RecordsAffected = -2;//从库不允许执行非查询操作。
string msg = "You can't do ExeScalarSQL(with transaction or insert) on Slave DataBase!";
DebugInfo.Append(msg + AppConst.BR);
WriteError(msg + (isProc ? "" : AppConst.BR + GetParaInfo(cmdText)));
}
else
{
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)));