MDEV-788 mysqlimport should support the ability to disable foreign keys

client/mysqlimport.c

@@ -48,8 +48,8 @@ static char *add_load_option(char *ptr,const char *object,
 			     const char *statement);
 
 static my_bool	verbose=0,lock_tables=0,ignore_errors=0,opt_delete=0,
-		replace=0,silent=0,ignore=0,opt_compress=0,
-                opt_low_priority= 0, tty_password= 0;
+                replace, silent, ignore, ignore_foreign_keys,
+                opt_compress, opt_low_priority, tty_password;
 static my_bool debug_info_flag= 0, debug_check_flag= 0;
 static uint opt_use_threads=0, opt_local_file=0, my_end_arg= 0;
 static char	*opt_password=0, *current_user=0,
@@ -123,6 +123,10 @@ static struct my_option my_long_options[] =
    &current_host, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"ignore", 'i', "If duplicate unique key was found, keep old row.",
    &ignore, &ignore, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
+  {"ignore-foreign-keys", 'k',
+    "Disable foreign key checks while importing the data.",
+    &ignore_foreign_keys, &ignore_foreign_keys, 0, GET_BOOL, NO_ARG,
+    0, 0, 0, 0, 0, 0},
   {"ignore-lines", OPT_IGN_LINES, "Ignore first n lines of data infile.",
    &opt_ignore_lines, &opt_ignore_lines, 0, GET_LL,
    REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
@@ -487,6 +491,9 @@ static MYSQL *db_connect(char *host, char *database,
     ignore_errors=0;
     db_error(mysql);
   }
+  if (ignore_foreign_keys)
+    mysql_query(mysql, "set foreign_key_checks= 0;");
+
   return mysql;
 }
 

mysql-test/r/mysqldump.result

@@ -5610,3 +5610,21 @@ DROP FUNCTION f;
 #
 DROP VIEW v1;
 DROP FUNCTION f;
+#
+# MDEV-788 New option to ignore foreign key contraints in mysqlimport
+#
+create table t1 (
+id int primary key
+) engine=InnoDB;
+create table t2 (
+t1_id int,
+CONSTRAINT fk
+FOREIGN KEY (t1_id) REFERENCES t1 (id)
+) ENGINE = InnoDB;
+select count(*) from t2;
+count(*)
+1
+select count(*) from t2;
+count(*)
+2
+drop tables t2, t1;

mysql-test/t/mysqldump.test

@@ -2484,6 +2484,7 @@ DROP TABLE t1;
 DROP TABLE t2;
 DROP DATABASE db_20772273;
 USE test;
+--remove_file $MYSQLTEST_VARDIR/tmp/t2.txt
 
 --echo #
 --echo # Bug #25717383: MYSQLDUMP MAY EXECUTE ANY ARBITRARY QUERY
@@ -2649,3 +2650,31 @@ DROP FUNCTION f;
 --echo #
 DROP VIEW v1;
 DROP FUNCTION f;
+
+--echo #
+--echo # MDEV-788 New option to ignore foreign key contraints in mysqlimport
+--echo #
+create table t1 (
+  id int primary key
+) engine=InnoDB;
+
+create table t2 (
+  t1_id int,
+  CONSTRAINT fk
+    FOREIGN KEY (t1_id) REFERENCES t1 (id)
+) ENGINE = InnoDB;
+
+--write_file $MYSQLTEST_VARDIR/tmp/t2.txt
+0
+EOF
+
+--error 1
+--exec $MYSQL_IMPORT --silent test $MYSQLTEST_VARDIR/tmp/t2.txt
+--exec $MYSQL_IMPORT --silent -k test $MYSQLTEST_VARDIR/tmp/t2.txt
+select count(*) from t2;
+
+--exec $MYSQL_IMPORT --silent --ignore-foreign-keys test $MYSQLTEST_VARDIR/tmp/t2.txt
+select count(*) from t2;
+
+--remove_file $MYSQLTEST_VARDIR/tmp/t2.txt
+drop tables t2, t1;