【发布时间】：2016-09-29 20:24:18
【问题描述】：
如下所示，使用带有 int 和 char 的“cast”可以正常工作， 但分别使用 bigint 和 varchar 的相同命令不会。
这是 mysql 中的一个已知问题吗？ 我在使用 jooq 时遇到了这个问题 - 下面有更多详细信息。
如果在 mysql 或 jooq 中有解决方法，那就太好了。 谢谢！
版本
$ mysql --version
mysql Ver 15.1 Distrib 5.5.39-MariaDB, for debian-linux-gnu (x86_64) using readline 5.1
SQL 命令 这两个工作正常
MariaDB [puresw]> select cast(100 as int);
+------------------+
| cast(100 as int) |
+------------------+
| 100 |
+------------------+
1 row in set (0.01 sec)
MariaDB [puresw]> select cast('abc' as char(32));
+-------------------------+
| cast('abc' as char(32)) |
+-------------------------+
| abc |
+-------------------------+
1 row in set (0.00 sec)
这两个没有
MariaDB [puresw]> select cast(100 as bigint);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'bigint)' at line 1
MariaDB [puresw]> select cast('abc' as varchar(32));
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'varchar(32))' at line 1
jooq生成的SQL查询引起的问题
Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'bigint), cast(0 as int), cast('ABC' as varchar), cast('Purity' as varchar), cast' at line 1
Query is:
sql : 'insert into software_version (task_id, controller, group_id, name, version, status) values (cast(? as bigint), cast(? as int), cast(? as varchar), cast(? as varchar), cast(? as varchar), cast(? as varchar))', parameters : [100,0,'ABC','Purity','4.5.2','Available']
at org.mariadb.jdbc.internal.SQLExceptionMapper.get(SQLExceptionMapper.java:138) ~[mariadb-java-client-1.1.9.jar:?]
at org.mariadb.jdbc.internal.SQLExceptionMapper.throwException(SQLExceptionMapper.java:106) ~[mariadb-java-client-1.1.9.jar:?]
at org.mariadb.jdbc.MySQLStatement.executeQueryEpilog(MySQLStatement.java:268) ~[mariadb-java-client-1.1.9.jar:?]
at org.mariadb.jdbc.MySQLStatement.execute(MySQLStatement.java:296) ~[mariadb-java-client-1.1.9.jar:?]
at org.mariadb.jdbc.MySQLStatement.executeUpdate(MySQLStatement.java:364) ~[mariadb-java-client-1.1.9.jar:?]
at org.mariadb.jdbc.MySQLPreparedStatement.executeUpdate(MySQLPreparedStatement.java:148) ~[mariadb-java-client-1.1.9.jar:?]
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105) ~[commons-dbcp-1.4.jar:1.4]
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105) ~[commons-dbcp-1.4.jar:1.4]
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:916) ~[spring-jdbc-4.1.7.RELEASE.jar:4.1.7.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:909) ~[spring-jdbc-4.1.7.RELEASE.jar:4.1.7.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:644) ~[spring-jdbc-4.1.7.RELEASE.jar:4.1.7.RELEASE]
... 43 more
【问题讨论】：
-
cast 不支持所有类型 dev.mysql.com/doc/refman/5.7/en/… 以我的经验，在许多情况下转换为“int”就是转换为“bigint”（根据 odbc 结果）。
-
你是如何构建你的 jOOQ 查询的？你确定你使用了合适的
SQLDialect吗？如果一切配置正确，jOOQ 就可以为 MySQL 和 MariaDB 提供此功能... -
感谢您的回复。请在下面查看我的回复。 mysql 中断看起来不正确 - 看起来像一个错误。