今天使用Access通过 mysql-connector-odbc 连接到mysql ,却发现无法显示一个字段Desc的内容

经过研究发现，原来Desc是mysql的保留字 关键字，所以出错

要在这个字段前后加上撇号（单引号）

select 'Desc'  from table;

但即使加上了，但用ado记录集提取时还是取不到

必须 要使用别名

select 'Desc' as MyDesc from table;

然后在ADO中使用 rs("MyDesc") 就可以了

相关文章：

我们知道通常的SQL查询语句是这么写的：

复制代码 代码如下:

select col from table;

这当然没问题，但如果字段名是“from”呢？

复制代码 代码如下:

select from from table;

若真的这么写，必然出错，当字段名与MySQL保留字冲突时，可以用字符“`”将字段名括起来：

复制代码 代码如下:

select `from` from table;

总结

刚发现我原先设计的数据库表里有两个字段都用了保留字（add，comment）。在insert和update的时候出错。记得sql server里好像是用[]括起来就ok了。于是试了一下，事实证明这在mySql里行不通。上网简单搜了一下发现都是说用中括号。后来又想到MySql Administrator生成的sql语句好像会把表名什么都用单引号括起来。试了一下，还是行不通。但复制生成的那个符号发现可以。确定那个符号不是单引号。一看才发现时撇号（` 就是数字1前面那个键上的）。到此问题解决。总结一下就是一句话：

在Mysql中，当表名或字段名乃至数据库名和保留字冲突时，在sql语句里可以用撇号（`）括起来。

Table 10.2 Keywords and Reserved Words in MySQL 5.7

ACCESSIBLE (R)

ACCOUNT[a]

ACTION

ADD (R)

AFTER

AGAINST

AGGREGATE

ALGORITHM

ALL (R)

ALTER (R)

ALWAYS[b]

ANALYSE

ANALYZE (R)

AND (R)

ANY

AS (R)

ASC (R)

ASCII

ASENSITIVE (R)

AT

AUTOEXTEND_SIZE

AUTO_INCREMENT

AVG

AVG_ROW_LENGTH

BACKUP

BEFORE (R)

BEGIN

BETWEEN (R)

BIGINT (R)

BINARY (R)

BINLOG

BIT

BLOB (R)

BLOCK

BOOL

BOOLEAN

BOTH (R)

BTREE

BY (R)

BYTE

CACHE

CALL (R)

CASCADE (R)

CASCADED

CASE (R)

CATALOG_NAME

CHAIN

CHANGE (R)

CHANGED

CHANNEL[c]

CHAR (R)

CHARACTER (R)

CHARSET

CHECK (R)

CHECKSUM

CIPHER

CLASS_ORIGIN

CLIENT

CLOSE

COALESCE

CODE

COLLATE (R)

COLLATION

COLUMN (R)

COLUMNS

COLUMN_FORMAT

COLUMN_NAME

COMMENT

COMMIT

COMMITTED

COMPACT

COMPLETION

COMPRESSED

COMPRESSION[d]

CONCURRENT

CONDITION (R)

CONNECTION

CONSISTENT

CONSTRAINT (R)

CONSTRAINT_CATALOG

CONSTRAINT_NAME

CONSTRAINT_SCHEMA

CONTAINS

CONTEXT

CONTINUE (R)

CONVERT (R)

CPU

CREATE (R)

CROSS (R)

CUBE

CURRENT

CURRENT_DATE (R)

CURRENT_TIME (R)

CURRENT_TIMESTAMP (R)

CURRENT_USER (R)

CURSOR (R)

CURSOR_NAME

DATA

DATABASE (R)

DATABASES (R)

DATAFILE

DATE

DATETIME

DAY

DAY_HOUR (R)

DAY_MICROSECOND (R)

DAY_MINUTE (R)

DAY_SECOND (R)

DEALLOCATE

DEC (R)

DECIMAL (R)

DECLARE (R)

DEFAULT (R)

DEFAULT_AUTH

DEFINER

DELAYED (R)

DELAY_KEY_WRITE

DELETE (R)

DESC (R)

DESCRIBE (R)

DES_KEY_FILE

DETERMINISTIC (R)

DIAGNOSTICS

DIRECTORY

DISABLE

DISCARD

DISK

DISTINCT (R)

DISTINCTROW (R)

DIV (R)

DO

DOUBLE (R)

DROP (R)

DUAL (R)

DUMPFILE

DUPLICATE

DYNAMIC

EACH (R)

ELSE (R)

ELSEIF (R)

ENABLE

ENCLOSED (R)

ENCRYPTION[e]

END

ENDS

ENGINE

ENGINES

ENUM

ERROR

ERRORS

ESCAPE

ESCAPED (R)

EVENT

EVENTS

EVERY

EXCHANGE

EXECUTE

EXISTS (R)

EXIT (R)

EXPANSION

EXPIRE

EXPLAIN (R)

EXPORT

EXTENDED

EXTENT_SIZE

FALSE (R)

FAST

FAULTS

FETCH (R)

FIELDS

FILE

FILE_BLOCK_SIZE[f]

FILTER[g]

FIRST

FIXED

FLOAT (R)

FLOAT4 (R)

FLOAT8 (R)

FLUSH

FOLLOWS[h]

FOR (R)

FORCE (R)

FOREIGN (R)

FORMAT

FOUND

FROM (R)

FULL

FULLTEXT (R)

FUNCTION

GENERAL

GENERATED[i] (R)

GEOMETRY

GEOMETRYCOLLECTION

GET (R)

GET_FORMAT

GLOBAL

GRANT (R)

GRANTS

GROUP (R)

GROUP_REPLICATION[j]

HANDLER

HASH

HAVING (R)

HELP

HIGH_PRIORITY (R)

HOST

HOSTS

HOUR

HOUR_MICROSECOND (R)

HOUR_MINUTE (R)

HOUR_SECOND (R)

IDENTIFIED

IF (R)

IGNORE (R)

IGNORE_SERVER_IDS

IMPORT

IN (R)

INDEX (R)

INDEXES

INFILE (R)

INITIAL_SIZE

INNER (R)

INOUT (R)

INSENSITIVE (R)

INSERT (R)

INSERT_METHOD

INSTALL

INSTANCE[k]

INT (R)

INT1 (R)

INT2 (R)

INT3 (R)

INT4 (R)

INT8 (R)

INTEGER (R)

INTERVAL (R)

INTO (R)

INVOKER

IO

IO_AFTER_GTIDS (R)

IO_BEFORE_GTIDS (R)

IO_THREAD

IPC

IS (R)

ISOLATION

ISSUER

ITERATE (R)

JOIN (R)

JSON[l]

KEY (R)

KEYS (R)

KEY_BLOCK_SIZE

KILL (R)

LANGUAGE

LAST

LEADING (R)

LEAVE (R)

LEAVES

LEFT (R)

LESS

LEVEL

LIKE (R)

LIMIT (R)

LINEAR (R)

LINES (R)

LINESTRING

LIST

LOAD (R)

LOCAL

LOCALTIME (R)

LOCALTIMESTAMP (R)

LOCK (R)

LOCKS

LOGFILE

LOGS

LONG (R)

LONGBLOB (R)

LONGTEXT (R)

LOOP (R)

LOW_PRIORITY (R)

MASTER

MASTER_AUTO_POSITION

MASTER_BIND (R)

MASTER_CONNECT_RETRY

MASTER_DELAY

MASTER_HEARTBEAT_PERIOD

MASTER_HOST

MASTER_LOG_FILE

MASTER_LOG_POS

MASTER_PASSWORD

MASTER_PORT

MASTER_RETRY_COUNT

MASTER_SERVER_ID

MASTER_SSL

MASTER_SSL_CA

MASTER_SSL_CAPATH

MASTER_SSL_CERT

MASTER_SSL_CIPHER

MASTER_SSL_CRL

MASTER_SSL_CRLPATH

MASTER_SSL_KEY

MASTER_SSL_VERIFY_SERVER_CERT (R)

MASTER_TLS_VERSION[m]

MASTER_USER

MATCH (R)

MAXVALUE (R)

MAX_CONNECTIONS_PER_HOUR

MAX_QUERIES_PER_HOUR

MAX_ROWS

MAX_SIZE

MAX_STATEMENT_TIME[n]

MAX_UPDATES_PER_HOUR

MAX_USER_CONNECTIONS

MEDIUM

MEDIUMBLOB (R)

MEDIUMINT (R)

MEDIUMTEXT (R)

MEMORY

MERGE

MESSAGE_TEXT

MICROSECOND

MIDDLEINT (R)

MIGRATE

MINUTE

MINUTE_MICROSECOND (R)

MINUTE_SECOND (R)

MIN_ROWS

MOD (R)

MODE

MODIFIES (R)

MODIFY

MONTH

MULTILINESTRING

MULTIPOINT

MULTIPOLYGON

MUTEX

MYSQL_ERRNO

NAME

NAMES

NATIONAL

NATURAL (R)

NCHAR

NDB

NDBCLUSTER

NEVER[o]

NEW

NEXT

NO

NODEGROUP

NONBLOCKING[p]

NONE

NOT (R)

NO_WAIT

NO_WRITE_TO_BINLOG (R)

NULL (R)

NUMBER

NUMERIC (R)

NVARCHAR

OFFSET

OLD_PASSWORD[q]

ON (R)

ONE

ONLY

OPEN

OPTIMIZE (R)

OPTIMIZER_COSTS[r] (R)

OPTION (R)

OPTIONALLY (R)

OPTIONS

OR (R)

ORDER (R)

OUT (R)

OUTER (R)

OUTFILE (R)

OWNER

PACK_KEYS

PAGE

PARSER

PARSE_GCOL_EXPR[s]

PARTIAL

PARTITION (R)

PARTITIONING

PARTITIONS

PASSWORD

PHASE

PLUGIN

PLUGINS

PLUGIN_DIR

POINT

POLYGON

PORT

PRECEDES[t]

PRECISION (R)

PREPARE

PRESERVE

PREV

PRIMARY (R)

PRIVILEGES

PROCEDURE (R)

PROCESSLIST

PROFILE

PROFILES

PROXY

PURGE (R)

QUARTER

QUERY

QUICK

RANGE (R)

READ (R)

READS (R)

READ_ONLY

READ_WRITE (R)

REAL (R)

REBUILD

RECOVER

REDOFILE

REDO_BUFFER_SIZE

REDUNDANT

REFERENCES (R)

REGEXP (R)

RELAY

RELAYLOG

RELAY_LOG_FILE

RELAY_LOG_POS

RELAY_THREAD

RELEASE (R)

RELOAD

REMOVE

RENAME (R)

REORGANIZE

REPAIR

REPEAT (R)

REPEATABLE

REPLACE (R)

REPLICATE_DO_DB[u]

REPLICATE_DO_TABLE[v]

REPLICATE_IGNORE_DB[w]

REPLICATE_IGNORE_TABLE[x]

REPLICATE_REWRITE_DB[y]

REPLICATE_WILD_DO_TABLE[z]

REPLICATE_WILD_IGNORE_TABLE[aa]

REPLICATION

REQUIRE (R)

RESET

RESIGNAL (R)

RESTORE

RESTRICT (R)

RESUME

RETURN (R)

RETURNED_SQLSTATE

RETURNS

REVERSE

REVOKE (R)

RIGHT (R)

RLIKE (R)

ROLLBACK

ROLLUP

ROTATE[ab]

ROUTINE

ROW

ROWS

ROW_COUNT

ROW_FORMAT

RTREE

SAVEPOINT

SCHEDULE

SCHEMA (R)

SCHEMAS (R)

SCHEMA_NAME

SECOND

SECOND_MICROSECOND (R)

SECURITY

SELECT (R)

SENSITIVE (R)

SEPARATOR (R)

SERIAL

SERIALIZABLE

SERVER

SESSION

SET (R)

SHARE

SHOW (R)

SHUTDOWN

SIGNAL (R)

SIGNED

SIMPLE

SLAVE

SLOW

SMALLINT (R)

SNAPSHOT

SOCKET

SOME

SONAME

SOUNDS

SOURCE

SPATIAL (R)

SPECIFIC (R)

SQL (R)

SQLEXCEPTION (R)

SQLSTATE (R)

SQLWARNING (R)

SQL_AFTER_GTIDS

SQL_AFTER_MTS_GAPS

SQL_BEFORE_GTIDS

SQL_BIG_RESULT (R)

SQL_BUFFER_RESULT

SQL_CACHE

SQL_CALC_FOUND_ROWS (R)

SQL_NO_CACHE

SQL_SMALL_RESULT (R)

SQL_THREAD

SQL_TSI_DAY

SQL_TSI_HOUR

SQL_TSI_MINUTE

SQL_TSI_MONTH

SQL_TSI_QUARTER

SQL_TSI_SECOND

SQL_TSI_WEEK

SQL_TSI_YEAR

SSL (R)

STACKED

START

STARTING (R)

STARTS

STATS_AUTO_RECALC

STATS_PERSISTENT

STATS_SAMPLE_PAGES

STATUS

STOP

STORAGE

STORED[ac] (R)

STRAIGHT_JOIN (R)

STRING

SUBCLASS_ORIGIN

SUBJECT

SUBPARTITION

SUBPARTITIONS

SUPER

SUSPEND

SWAPS

SWITCHES

TABLE (R)

TABLES

TABLESPACE

TABLE_CHECKSUM

TABLE_NAME

TEMPORARY

TEMPTABLE

TERMINATED (R)

TEXT

THAN

THEN (R)

TIME

TIMESTAMP

TIMESTAMPADD

TIMESTAMPDIFF

TINYBLOB (R)

TINYINT (R)

TINYTEXT (R)

TO (R)

TRAILING (R)

TRANSACTION

TRIGGER (R)

TRIGGERS

TRUE (R)

TRUNCATE

TYPE

TYPES

UNCOMMITTED

UNDEFINED

UNDO (R)

UNDOFILE

UNDO_BUFFER_SIZE

UNICODE

UNINSTALL

UNION (R)

UNIQUE (R)

UNKNOWN

UNLOCK (R)

UNSIGNED (R)

UNTIL

UPDATE (R)

UPGRADE

USAGE (R)

USE (R)

USER

USER_RESOURCES

USE_FRM

USING (R)

UTC_DATE (R)

UTC_TIME (R)

UTC_TIMESTAMP (R)

VALIDATION[ad]

VALUE

VALUES (R)

VARBINARY (R)

VARCHAR (R)

VARCHARACTER (R)

VARIABLES

VARYING (R)

VIEW

VIRTUAL[ae] (R)

WAIT

WARNINGS

WEEK

WEIGHT_STRING

WHEN (R)

WHERE (R)

WHILE (R)

WITH (R)

WITHOUT[af]

WORK

WRAPPER

WRITE (R)

X509

XA

XID[ag]

XML

XOR (R)

YEAR

YEAR_MONTH (R)

ZEROFILL (R)

[a] ACCOUNT: added in 5.7.6 (nonreserved) [b] ALWAYS: added in 5.7.6 (nonreserved) [c] CHANNEL: added in 5.7.6 (nonreserved) [d] COMPRESSION: added in 5.7.8 (nonreserved) [e] ENCRYPTION: added in 5.7.11 (nonreserved) [f] FILE_BLOCK_SIZE: added in 5.7.6 (nonreserved) [g] FILTER: added in 5.7.3 (nonreserved) [h] FOLLOWS: added in 5.7.2 (nonreserved) [i] GENERATED: added in 5.7.6 (reserved) [j] GROUP_REPLICATION: added in 5.7.6 (nonreserved) [k] INSTANCE: added in 5.7.11 (nonreserved) [l] JSON: added in 5.7.8 (nonreserved) [m] MASTER_TLS_VERSION: added in 5.7.10 (nonreserved) [n] MAX_STATEMENT_TIME: added in 5.7.4 (nonreserved); removed in 5.7.8 [o] NEVER: added in 5.7.4 (nonreserved) [p] NONBLOCKING: removed in 5.7.6 [q] OLD_PASSWORD: removed in 5.7.5 [r] OPTIMIZER_COSTS: added in 5.7.5 (reserved) [s] PARSE_GCOL_EXPR: added in 5.7.6 (reserved); became nonreserved in 5.7.8 [t] PRECEDES: added in 5.7.2 (nonreserved) [u] REPLICATE_DO_DB: added in 5.7.3 (nonreserved) [v] REPLICATE_DO_TABLE: added in 5.7.3 (nonreserved) [w] REPLICATE_IGNORE_DB: added in 5.7.3 (nonreserved) [x] REPLICATE_IGNORE_TABLE: added in 5.7.3 (nonreserved) [y] REPLICATE_REWRITE_DB: added in 5.7.3 (nonreserved) [z] REPLICATE_WILD_DO_TABLE: added in 5.7.3 (nonreserved) [aa] REPLICATE_WILD_IGNORE_TABLE: added in 5.7.3 (nonreserved) [ab] ROTATE: added in 5.7.11 (nonreserved) [ac] STORED: added in 5.7.6 (reserved) [ad] VALIDATION: added in 5.7.5 (nonreserved) [ae] VIRTUAL: added in 5.7.6 (reserved) [af] WITHOUT: added in 5.7.5 (nonreserved) [ag] XID: added in 5.7.5 (nonreserved)

The following table shows the keywords and reserved words that are added in MySQL 5.7. Reserved keywords are marked with (R).

Table 10.3 Keywords and Reserved Words Added in MySQL 5.7 Compared to MySQL 5.6

ACCOUNT	ALWAYS	CHANNEL
COMPRESSION	ENCRYPTION	FILE_BLOCK_SIZE
FILTER	FOLLOWS	GENERATED (R)
GROUP_REPLICATION	INSTANCE	JSON
MASTER_TLS_VERSION	NEVER	OPTIMIZER_COSTS (R)
PARSE_GCOL_EXPR	PRECEDES	REPLICATE_DO_DB
REPLICATE_DO_TABLE	REPLICATE_IGNORE_DB	REPLICATE_IGNORE_TABLE
REPLICATE_REWRITE_DB	REPLICATE_WILD_DO_TABLE	REPLICATE_WILD_IGNORE_TABLE
ROTATE	STACKED	STORED (R)
VALIDATION	VIRTUAL (R)	WITHOUT
XID

The following table shows the keywords and reserved words that are removed in MySQL 5.7. Reserved keywords are marked with (R).

Table 10.4 Keywords and Reserved Words Removed in MySQL 5.7 Compared to MySQL 5.6

OLD_PASSWORD