除了建立连接外,我在使用clojure.contrib.sql做任何事情时都遇到麻烦.

我有一个在localhost：3306上运行的mysqld,数据库名为clj_db.
密码为“ clj_pass”的用户“ clj_user” @“ localhost”可以访问该数据库.

当尝试“从clj_table中选择*”时,我得到一个“ com.MysqL.jdbc.exceptions.MySQLSyntaxErrorException：您的sql语法有误；请查看与您的MysqL服务器版本相对应的手册,以获取在’附近使用正确的语法” ????????????????’在第1行”.

我究竟做错了什么？

clj_db.clj_table

CREATE TABLE `clj_table` (
  `col_one` int(11) NOT NULL,`col_two` int(11) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

MysqL_test.clj

(ns test.MysqL
    (:use clojure.contrib.sql)
)

(def db-settings
    {:classname "com.MysqL.jdbc.Driver"
    :subprotocol "MysqL"
    :subname "//localhost:3306/clj_db"
    :user "clj_user"
    :password "clj_pass"})

(with-connection db-settings
    (with-query-results rs ["select * from clj_table"]
        (dorun (map #(println (:col_one :col_two %)) rs))
    ))

输出量

Exception in thread "main" com.MysqL.jdbc.exceptions.MysqLSyntaxErrorException: You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near '????????????????' at line 1 (MysqL_test.clj:0)
   at clojure.lang.Compiler.eval(Compiler.java:4658)
   at clojure.lang.Compiler.load(Compiler.java:4972)
   at clojure.lang.Compiler.loadFile(Compiler.java:4939)
   at clojure.main$load_script__7405.invoke(main.clj:213)
   at clojure.main$script_opt__7442.invoke(main.clj:265)
   at clojure.main$main__7466.doInvoke(main.clj:346)
   at clojure.lang.RestFn.invoke(RestFn.java:441)
   at clojure.lang.Var.invoke(Var.java:367)
   at clojure.lang.AFn.applyToHelper(AFn.java:179)
   at clojure.lang.Var.applyTo(Var.java:476)
   at clojure.main.main(main.java:37)
Caused by: com.MysqL.jdbc.exceptions.MysqLSyntaxErrorException: You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near '????????????????' at line 1
   at com.MysqL.jdbc.sqlError.createsqlException(sqlError.java:1048)
   at com.MysqL.jdbc.MysqLIO.checkErrorPacket(MysqLIO.java:3563)
   at com.MysqL.jdbc.MysqLIO.checkErrorPacket(MysqLIO.java:3495)
   at com.MysqL.jdbc.MysqLIO.sendCommand(MysqLIO.java:1959)
   at com.MysqL.jdbc.MysqLIO.sqlQueryDirect(MysqLIO.java:2113)
   at com.MysqL.jdbc.ConnectionImpl.execsql(ConnectionImpl.java:2687)
   at com.MysqL.jdbc.ConnectionImpl.configureClientCharacterSet(ConnectionImpl.java:1859)
   at com.MysqL.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3593)
   at com.MysqL.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2199)
   at com.MysqL.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:784)
   at com.MysqL.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:350)
   at com.MysqL.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:284)
   at java.sql.DriverManager.getConnection(libgcj.so.10)
   at clojure.contrib.sql.internal$get_connection__218.invoke(internal.clj:85)
   at clojure.contrib.sql.internal$with_connection_STAR___226.invoke(internal.clj:102)
   at test.MysqL$eval__386.invoke(MysqL_test.clj:12)
   at clojure.lang.Compiler.eval(Compiler.java:4642)
   ...10 more