/// <summary>
/// 封装了对应的SqlMap的方法，异步分批执行查询并返回数据库表
/// </summary>
/// <param name="statementName">语句名</param>
/// <param name="parameterObject">参数名</param>
/// <param name="skipResults"></param>
/// <param name="maxResults"></param>
/// <param name="postProcessTempDataHandler"></param>
/// <param name="tempDataArrivalHandler"></param>
/// <returns></returns>
protected void AsynExecuteQueryForDataTable(string statementName,
object parameterObject,
int skipResults,
int maxResults,
PostProcessTempDataHandler postProcessTempDataHandler,
TempDataArrivalHandler tempDataArrivalHandler)
{
ISqlMapper sqlMap = GetLocalSqlMap();
SafeDataReader dr = null;
try
{
if (needDirtyRead && ContainsDirtyReadStatement())
{
SetDirtyRead();
}
dr = ExecuteDataReader(statementName, parameterObject);
//using (SafeDataReader dr = ExecuteDataReader(statementName, parameterObject))
{
//输出表
DataTable resultTable = null;
int[,] indexMapping = null;
// skip results
for (int i = 0; i < skipResults; i++)
{
if (!dr.Read())
{
break;
}
}
int resultsFetched = 0;
while ((maxResults == NO_MAXIMUM_RESULTS || resultsFetched < maxResults) &&
dr.Read())
{
//while (dr.Read())
if (resultTable == null)
{
resultTable = CreateSchemaTable(dr, out indexMapping);
}
#region 填充数据
DataRow dataRow = (resultTable).NewRow();
int count = dr.FieldCount;
for (int i = 0; i < count; i++)
{
if (indexMapping[1, i] != -1)
{
dataRow[indexMapping[1, i]] = dr[indexMapping[0, i]] ?? DBNull.Value;
}
}
(resultTable).Rows.Add(dataRow);
#endregion
//临时数据送出
if (resultTable.Rows.Count > TMPRESULT_SIZE)
{
//数据后处理
if (postProcessTempDataHandler != null)
{
postProcessTempDataHandler(resultTable);
}
tempDataArrivalHandler(resultTable);
resultTable = CreateSchemaTable(dr, out indexMapping);
}
resultsFetched++;
}
if (resultTable == null)
{
DataTable dataColumn = dr.GetSchemaTable();
if (dataColumn != null)
{
resultTable = new DataTable("statementName");
for (int i = 0; i < dataColumn.Rows.Count; i++)
{
resultTable.Columns.Add(dataColumn.Rows[i]["ColumnName"].ToString(),
(Type)dataColumn.Rows[i]["DataType"]);
}
}
}
//数据后处理
if (postProcessTempDataHandler != null)
{
postProcessTempDataHandler(resultTable);
}
//最后数据送出
tempDataArrivalHandler(resultTable);
//FireTempDataArrival(resultTable);
}
}
catch (Exception e)
{
Trace.Write(e.Message + "\n" + e.StackTrace);
throw new IBatisNetException(
"Error executing query '" + statementName + "' for object. Cause: " + e.Message, e);
}
finally
{
if (dr != null)
{
dr.Dispose();
}
}
}
/// <summary>
/// 封装了对应的SqlMap的方法，异步分批执行查询并返回数据库表
/// </summary>
/// <param name="statementName">语句名</param>
/// <param name="parameterObject">参数名</param>
/// <param name="postProcessTempDataHandler"></param>
/// <param name="tempDataArrivalHandler"></param>
/// <returns></returns>
protected void AsynExecuteQueryForDataTable(string statementName,
object parameterObject,
PostProcessTempDataHandler postProcessTempDataHandler,
TempDataArrivalHandler tempDataArrivalHandler)
{
//强制最大值返回(为了兼容以前的代码，后续要改)
if (ForceMaxResults)
{
AsynExecuteQueryForDataTable(statementName, parameterObject,
-1, MAXRESULTS,
postProcessTempDataHandler, tempDataArrivalHandler);
}
else //正常执行
{
ISqlMapper sqlMap = GetLocalSqlMap();
SafeDataReader dr = null;
try
{
if (needDirtyRead && ContainsDirtyReadStatement())
{
SetDirtyRead();
}
dr = ExecuteDataReader(statementName, parameterObject);
//using (SafeDataReader dr = ExecuteDataReader(statementName, parameterObject))
{
//输出表
DataTable resultTable = null;
int[,] indexMapping = null;
while (dr.Read())
{
if (resultTable == null)
{
resultTable = CreateSchemaTable(dr, out indexMapping);
}
#region 填充数据
DataRow dataRow = resultTable.NewRow();
int count = dr.FieldCount;
for (int i = 0; i < count; i++)
{
if (indexMapping[1, i] != -1)
{
dataRow[indexMapping[1, i]] = dr[indexMapping[0, i]] ?? DBNull.Value;
}
}
resultTable.Rows.Add(dataRow);
#endregion
//临时数据送出
if (resultTable.Rows.Count > TMPRESULT_SIZE)
{
//数据后处理
if (postProcessTempDataHandler != null)
{
postProcessTempDataHandler(resultTable);
}
tempDataArrivalHandler(resultTable);
resultTable = CreateSchemaTable(dr, out indexMapping);
}
}
//数据后处理
if (postProcessTempDataHandler != null)
{
postProcessTempDataHandler(resultTable);
}
//最后数据送出
tempDataArrivalHandler(resultTable);
//FireTempDataArrival(resultTable);
}
}
catch (Exception e)
{
Trace.Write(e.Message + "\n" + e.StackTrace);
throw new IBatisNetException(
"Error executing query '" + statementName + "' for object. Cause: " + e.Message, e);
}
finally
{
if (dr != null)
{
dr.Dispose();
}
}
}
}
