【发布时间】：2019-08-08 20:29:45
【问题描述】：
我正在使用以下 SQL 查询从数据库中获取一些数据。我使用的 DBMS 是 H2，一个本地 java 实现。尽管我可以使用 H2 工具检索所述数据，但当我在 JAVA 中将其用作 PreparedStatement 时，它会给我以下错误：
"; 预期 ")"; SQL 语句：...
SELECT * FROM (
SELECT temp.*, ROW_NUMBER() OVER (PARTITION BY horseid ORDER BY updated desc) as num
FROM(
select horseid, name, breed, min_speed, max_speed, updated from horsehistory
UNION
select id, name, breed, min_speed, max_speed, updated from horse
) as temp
WHERE updated<? AND horseid in ?
)
WHERE num = 1;
我尝试过使用换行符、带行分隔符的字符串生成器无济于事。
StringBuilder sb= new StringBuilder();
appendString(sb, "SELECT * FROM (");
appendString(sb, "SELECT temp.*, ROW_NUMBER() OVER (PARTITION BY horseid ORDER BY updated desc) AS num");
appendString(sb, "FROM(");
appendString(sb, "SELECT horseid, name, breed, min_speed, max_speed, updated FROM horsehistory");
appendString(sb, "UNION");
appendString(sb, "SELECT id, name, breed, min_speed, max_speed, updated FROM horse");
appendString(sb, ") AS temp");
appendString(sb, "WHERE updated < ? AND horseid IN ?");
appendString(sb, ")");
appendString(sb, "WHERE num = 1;");
String sql=sb.toString();
appendString 函数只是将换行符附加到字符串。我在准备好的语句中使用它
我做错了什么？
编辑： 这是有问题的完整错误
Syntax error in SQL statement "SELECT * FROM ( SELECT TEMP.*, ROW_NUMBER() OVER (PARTITION[*] BY HORSEID ORDER BY UPDATED DESC) AS NUM FROM ( SELECT HORSEID, NAME, BREED, MIN_SPEED, MAX_SPEED, UPDATED FROM HORSEHISTORY UNION SELECT ID, NAME, BREED, MIN_SPEED, MAX_SPEED, UPDATED FROM HORSE ) AS TEMP WHERE UPDATED < ? AND HORSEID IN (?) ) WHERE NUM = 1 "; expected ")";
在 PARTITION 之后有一个 [*]。这是否意味着那里发生了错误？
【问题讨论】：
-
在最后删除
;会发生什么？ -
追加时排除空格。例如。
... AS num"); appendString(sb, "FROM(");变为"AS numFROM(" -
@Lino 同样的错误...
-
@xtratic appendString 函数负责处理它：
private void appendString(StringBuilder sb, String val){ sb.append(val + System.lineSeparator()); } -
打印您的
sql字符串并查看。
标签： java sql jdbc prepared-statement h2