static Sys_var_charptr Sys_remote_bak_host(
    "inception_remote_backup_host", "the host of remote backup.",
    READ_ONLY GLOBAL_VAR(remote_backup_host), CMD_LINE(REQUIRED_ARG),
    IN_FS_CHARSET, DEFAULT("localhost"));

static Sys_var_uint Sys_remote_bak_port(
    "inception_remote_backup_port",
    "Port number to use for remote backup.",
    READ_ONLY GLOBAL_VAR(remote_backup_port), CMD_LINE(REQUIRED_ARG),
    VALID_RANGE(0, UINT_MAX32), DEFAULT(0), BLOCK_SIZE(1));

......................

static Sys_var_charptr Sys_inception_support_charset(
    "inception_support_charset",
    "check charset when create table or alter, set multi charset use comma to concat",
    GLOBAL_VAR(inception_support_charset),
    CMD_LINE(REQUIRED_ARG), IN_FS_CHARSET, DEFAULT("utf8mb4"),
    NO_MUTEX_GUARD, NOT_IN_BINLOG,
    ON_CHECK(check_charset));

static Sys_var_mybool Sys_inception_check_table_comment(
    "inception_check_table_comment",
    "check comment when create table",
    GLOBAL_VAR(inception_check_table_comment),
    CMD_LINE(OPT_ARG), DEFAULT(TRUE));

  1 int
  2 mysql_check_inception_variables(
  3     THD * thd
  4 )
  5 {
  6     switch(thd->get_stmt_da()->sql_errno())
  7     {
  8     case ER_WITH_INSERT_FIELD:
  9         if (inception_check_insert_field)
 10             return true;
 11         else 
 12             return false;
 13         break;
 14 
 15     case ER_NO_WHERE_CONDITION:
 16         if (inception_check_dml_where)
 17             return true;
 18         else 
 19             return false;
 20         break;
 21 
 22     case ER_WITH_LIMIT_CONDITION:
 23         if (inception_check_dml_limit)
 24             return true;
 25         else 
 26             return false;
 27         break;
 28 
 29     case ER_WITH_ORDERBY_CONDITION:
 30         if (inception_check_dml_orderby)
 31             return true;
 32         else 
 33             return false;
 34         break;
 35 
 36     case ER_SELECT_ONLY_STAR:
 37         if (inception_enable_select_star)
 38             return false;
 39         break;
 40 
 41     case ER_ORDERY_BY_RAND:
 42         if (inception_enable_orderby_rand)
 43             return false;
 44         break;
 45 
 46     case ER_NOT_ALLOWED_NULLABLE:
 47         if (inception_enable_nullable)
 48             return false;
 49         break;
 50 
 51     case ER_FOREIGN_KEY:
 52         if (inception_enable_foreign_key)
 53             return false;
 54         break;
 55 
 56     case ER_USE_TEXT_OR_BLOB:
 57         if (inception_enable_blob_type)
 58             return false;
 59         break;
 60 
 61     case ER_TABLE_MUST_INNODB:
 62         if (inception_enable_not_innodb)
 63             return false;
 64         break;
 65 
 66 
 67     case ER_TABLE_MUST_HAVE_COMMENT:
 68         if (inception_check_table_comment)
 69             return true;
 70         else 
 71             return false;
 72         break;
 73 
 74     case ER_COLUMN_HAVE_NO_COMMENT:
 75         if (inception_check_column_comment)
 76             return true;
 77         else 
 78             return false;
 79         break;
 80 
 81     case ER_TABLE_MUST_HAVE_PK:
 82         if (inception_check_primary_key)
 83             return true;
 84         else 
 85             return false;
 86         break;
 87 
 88     case ER_PARTITION_NOT_ALLOWED:
 89         if (inception_enable_partition_table)
 90             return false;
 91         break;
 92 
 93     case ER_USE_ENUM:
 94     case ER_INVALID_DATA_TYPE:
 95         if (inception_enable_enum_set_bit)
 96             return false;
 97         break;
 98 
 99     case ER_INDEX_NAME_IDX_PREFIX:
100     case ER_INDEX_NAME_UNIQ_PREFIX:
101         if (inception_check_index_prefix)
102             return true;
103         else 
104             return false;
105         break;
106 
107     case ER_AUTOINC_UNSIGNED:
108         if (inception_enable_autoincrement_unsigned)
109             return true;
110         else 
111             return false;
112         break;
113 
114     case ER_INC_INIT_ERR:
115         if (inception_check_autoincrement_init_value)
116             return true;
117         else 
118             return false;
119         break;
120     case ER_INVALID_IDENT:
121         if (inception_check_identifier)
122             return true;
123         else 
124             return false;
125         break;
126 
127     case ER_SET_DATA_TYPE_INT_BIGINT:
128         if (inception_check_autoincrement_datatype)
129             return true;
130         else 
131             return false;
132         break;
133 
134     case ER_TIMESTAMP_DEFAULT:
135         if (inception_check_timestamp_default)
136             return true;
137         else 
138             return false;
139         break;
140 
141     case ER_CHARSET_ON_COLUMN:
142         if (inception_enable_column_charset)
143             return false;
144         break;
145 
146     case ER_IDENT_USE_KEYWORD:
147         if (inception_enable_identifer_keyword)
148             return false;
149         break;
150 
151     case ER_AUTO_INCR_ID_WARNING:
152         if (inception_check_autoincrement_name)
153             return true;
154         else 
155             return false;
156         break;
157 
158     case ER_ALTER_TABLE_ONCE:
159         if (inception_merge_alter_table)
160             return true;
161         else 
162             return false;
163         break;
164 
165     case ER_WITH_DEFAULT_ADD_COLUMN:
166         if (inception_check_column_default_value)
167             return true;
168         else 
169             return false;
170         break;
171 
172     default:
173         return true;
174     }
175 
176     return true;
177 }