/// <summary>
/// 执行查询语句
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="parameters">查询参数</param>
/// <param name="hints">指令扩展属性</param>
/// <param name="operationType">操作类型，读写分离，默认从master库读取</param>
/// <returns>IDataReader</returns>
/// <exception cref="DalException">数据访问框架异常</exception>
public IList <IDataReader> SelectDataReader(String sql, StatementParameterCollection parameters, IDictionary hints, OperationType operationType)
{
if (!IsShardEnabled)
{
Statement statement = SqlBuilder.GetSqlStatement(LogicDbName, ShardingStrategy, sql, parameters, hints, operationType).Single();
AddSqlToExtendParams(statement, hints);
try
{
var reader = DatabaseBridge.Instance.ExecuteReader(statement);
return(new List <IDataReader> {
reader
});
}
finally
{
RunTimeDetail runTimeDetail = new RunTimeDetail
{
DbName = statement.DbName,
Duration = statement.Duration,
Server = statement.HostName
};
if (hints != null)
{
hints.Add(DALExtStatementConstant.EXCUTE_TIME, new List <RunTimeDetail> {
runTimeDetail
});
}
}
}
else
{
var statements = ShardingUtil.GetShardStatement(LogicDbName, ShardingStrategy, parameters, hints, newHints => ShardingUtil.GetQueryStatement(LogicDbName, sql, ShardingStrategy, parameters, newHints, operationType), SqlStatementType.SELECT);
try
{
var reader = ShardingExecutor.GetShardingDataReaderList(statements);
return(reader);
}
finally
{
var runTimeList = new List <RunTimeDetail>();
foreach (var statement in statements)
{
RunTimeDetail runTimeDetail = new RunTimeDetail
{
DbName = statement.DbName,
Duration = statement.Duration,
Server = statement.HostName
};
runTimeList.Add(runTimeDetail);
}
if (hints != null)
{
hints.Add(DALExtStatementConstant.EXCUTE_TIME, runTimeList);
}
}
}
}
/// <summary>
/// 执行单返回值聚集查询指令
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="parameters">查询参数</param>
/// <param name="hints">指令参数：如timeout</param>
/// <param name="operationType">操作类型，读写分离，默认从master库读取</param>
/// <returns>object</returns>
/// <exception cref="DalException">数据访问框架异常</exception>
public Object ExecScalar(String sql, StatementParameterCollection parameters, IDictionary hints, OperationType operationType)
{
Object result = null;
if (!IsShardEnabled)
{
Statement statement = SqlBuilder.GetScalarStatement(LogicDbName, ShardingStrategy, sql, parameters, hints, operationType).Single();
AddSqlToExtendParams(statement, hints);
try
{
result = DatabaseBridge.Instance.ExecuteScalar(statement);
return(result);
}
finally
{
RunTimeDetail runTimeDetail = new RunTimeDetail
{
DbName = statement.DbName,
Duration = statement.Duration,
Server = statement.HostName
};
if (hints != null)
{
hints.Add(DALExtStatementConstant.EXCUTE_TIME, new List <RunTimeDetail> {
runTimeDetail
});
}
}
}
else
{
var statements = ShardingUtil.GetShardStatement(LogicDbName, ShardingStrategy, parameters, hints,
newHints => SqlBuilder.GetScalarStatement(LogicDbName, ShardingStrategy, sql, parameters, newHints, operationType), SqlStatementType.SELECT);
try
{
var temp = ShardingExecutor.ExecuteShardingScalar(statements);
if (temp.Count == 1)
{
result = temp[0];
return(result);
}
else
{
throw new DalException("ExecScalar exception:more than one shard.");
}
}
finally
{
var runTimeList = new List <RunTimeDetail>();
foreach (var statement in statements)
{
RunTimeDetail runTimeDetail = new RunTimeDetail
{
DbName = statement.DbName,
Duration = statement.Duration,
Server = statement.HostName
};
runTimeList.Add(runTimeDetail);
}
if (hints != null)
{
hints.Add(DALExtStatementConstant.EXCUTE_TIME, runTimeList);
}
}
}
}
