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MDEV-35953 mysql_stmt_errno() returns 0 after an error in mysql_stmt_execute()

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The goal of the fix for MDEV-34718 was to avoid
Diagnostics_area::reset_diagnostics_area() changing
DA_OK_BULK to DA_EMPTY for bulk operations.

But it was too indiscriminative and also didn't reset DA_ERROR
if the bulk operation was in progress. This was leaving Diagnostics_area
in the inconsistent state: the status was DA_ERROR, but sql_errno was 0.

Fix it to reset the DA_ERROR status as reset_diagnostics_area()
is supposed to do.
This commit is contained in:
Sergei Golubchik
2025-03-22 21:40:06 +01:00
parent 0b37c2e7a8
commit 56b19ac030
2 changed files with 61 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
sql/sql_error.cc
View File

@@ -318,18 +318,16 @@ Diagnostics_area::reset_diagnostics_area()
#endif
get_warning_info()->clear_error_condition();
set_is_sent(false);
/** Tiny reset in debug mode to see garbage right away */
if (!is_bulk_op())
/*
For BULK DML operations (e.g. UPDATE) the data member m_status
has the value DA_OK_BULK. Keep this value in order to handle
m_affected_rows, m_statement_warn_count in correct way. Else,
the number of rows and the number of warnings affected by
the last statement executed as part of a trigger fired by the dml
(e.g. UPDATE statement fires a trigger on AFTER UPDATE) would counts
rows modified by trigger's statement.
*/
m_status= DA_EMPTY;
/*
For BULK DML operations (e.g. UPDATE) the data member m_status
has the value DA_OK_BULK. Keep this value in order to handle
m_affected_rows, m_statement_warn_count in correct way. Else,
the number of rows and the number of warnings affected by
the last statement executed as part of a trigger fired by the dml
(e.g. UPDATE statement fires a trigger on AFTER UPDATE) would counts
rows modified by trigger's statement.
*/
m_status= is_bulk_op() ? DA_OK_BULK : DA_EMPTY;
DBUG_VOID_RETURN;
}

51
tests/mysql_client_test.c
View File

@@ -22886,8 +22886,58 @@ void test_mdev_10075()
DIE_UNLESS(rc == 1);
mysql_free_result(result);
mysql_query(mysql, "drop table t1");
}
static void test_mdev35953()
{
#ifndef EMBEDDED_LIBRARY
int rc;
MYSQL_STMT *stmt;
MYSQL_BIND bind[1];
int vals[]= {1, 2}, count= array_elements(vals);
MYSQL *con= mysql_client_init(NULL);
DIE_UNLESS(con);
if (!mysql_real_connect(con, opt_host, opt_user, opt_password, current_db,
opt_port, opt_unix_socket, 0))
{
fprintf(stderr, "Failed to connect to database: Error: %s\n",
mysql_error(con));
exit(1);
}
rc= mysql_query(mysql, "create table t1 (a int)");
myquery(rc);
stmt= mysql_stmt_init(con);
rc= mysql_stmt_prepare(stmt, "insert into t1 (a) values (?)", -1);
check_execute(stmt, rc);
memset(bind, 0, sizeof(bind));
bind[0].buffer_type = MYSQL_TYPE_LONG;
bind[0].buffer = vals;
mysql_stmt_attr_set(stmt, STMT_ATTR_ARRAY_SIZE, &count);
rc= mysql_stmt_bind_param(stmt, bind);
check_execute(stmt, rc);
rc= mysql_stmt_execute(stmt);
check_execute(stmt, rc);
rc= mysql_query(mysql, "alter table t1 add xx int");
myquery(rc);
rc= mysql_stmt_execute(stmt);
check_execute(stmt, rc);
mysql_stmt_close(stmt);
mysql_close(con);
mysql_query(mysql, "drop table t1");
#endif
}
static struct my_tests_st my_tests[]= {
{ "test_mdev_20516", test_mdev_20516 },
{ "test_mdev24827", test_mdev24827 },
@@ -23206,6 +23256,7 @@ static struct my_tests_st my_tests[]= {
{ "test_mdev_34958", test_mdev_34958 },
#endif
{ "test_mdev_10075", test_mdev_10075},
{ "test_mdev35953", test_mdev35953 },
{ 0, 0 }
};