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fix long column data fetching #490

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fix long column data fetching #490

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1 change: 1 addition & 0 deletions src/odbc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,7 @@ typedef struct StatementData {
SQLUINTEGER fetch_size;
SQLULEN rows_fetched;
bool result_set_end_reached = false;
bool has_long_data = false;

bool fetch_array = false;

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5 changes: 4 additions & 1 deletion src/odbc_connection.cpp
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Expand Up @@ -3430,7 +3430,7 @@ fetch_and_store(StatementData* data, bool set_position, bool* alloc_error) {
// iterate through all of the rows fetched (but not the fetch size)
for (size_t row_index = 0; row_index < data->rows_fetched; row_index++) {
if (set_position && data->get_data_supports.block &&
data->fetch_size > 1) {
data->fetch_size > 1 && data->has_long_data) {
// In case the result set contains columns that contain LONG data
// types, use SQLSetPos to set the row we are transferring bound data
// from, and use SQLGetData in the same loop.
Expand Down Expand Up @@ -3460,6 +3460,9 @@ fetch_and_store(StatementData* data, bool set_position, bool* alloc_error) {
// SQLBindCol, and therefore there is no data to move from a buffer.
// Instead, call SQLGetData, and adjust buffer size accordingly
if (data->columns[column_index]->is_long_data) {
// Set the statement data as having long data
data->has_long_data = true;

SQLPOINTER target_buffer;
SQLLEN buffer_size =
data->query_options.initial_long_data_buffer_size;
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