Question

我是PostgreSQL的新手。我要转换或将此代码添加到存储过程。

2019-01-25 08:51:26,842 SEVERE [org.eclipse.birt.report.engine.api.impl.ReportEngine] (default task-34) An error happened while running the report. Cause:: java.lang.NullPointerException
at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder$QueryBuilderVisitor.addColumnBinding(ReportQueryBuilder.java:1561)
at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder$QueryBuilderVisitor.createSubQuery(ReportQueryBuilder.java:1452)
at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder$QueryBuilderVisitor.createQuery(ReportQueryBuilder.java:1398)
at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder$QueryBuilderVisitor.visitGridItem(ReportQueryBuilder.java:509)
at org.eclipse.birt.report.engine.ir.GridItemDesign.accept(GridItemDesign.java:142)
at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder.build(ReportQueryBuilder.java:256)
at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder.build(ReportQueryBuilder.java:226)
at org.eclipse.birt.report.engine.data.dte.AbstractDataEngine.prepare(AbstractDataEngine.java:180)
at org.eclipse.birt.report.engine.executor.ReportExecutor.execute(ReportExecutor.java:122)
at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportExecutor.execute(WrappedReportExecutor.java:60)
...

Answer 1

只需将其放入函数中即可

  public Tokens(String token){
    contents = token;
    if (isNumeric(token)){
        type = "NUM";
    }else if (isAlpha(token)){
        for (int i = 0; i < Main.keywords.size(); i++){
            if (token.equals(Main.keywords.get(i).trim())){
                type = "KEYWORD";
                break;
            }else if (i == Main.keywords.size() - 1){
                type = "ID";
                break;
            }
        }
    }
}

您可以像这样使用它：

create function generate_anagrams(p_word text)
  returns table(combo text, word text)
as
$$
WITH RECURSIVE t(i) AS (
  SELECT * 
  FROM unnest((select regexp_split_to_array(p_word,''))::char[])
), cte AS (
     SELECT i AS combo, i, 1 AS ct 
     FROM t 
   UNION ALL 
     SELECT cte.combo || t.i, t.i, ct + 1
     FROM cte, t
     WHERE ct <= 8
       AND position(t.i in cte.combo) = 0
) 
SELECT distinct cc.combo,ww.word 
FROM cte cc 
   inner join words ww ON ww.word=cc.combo 
WHERE length(combo)>1 
  AND ww.source_id in(1,2,19,21,24,26,33,34) 
ORDER BY cc.combo ASC
$$
language sql;

我如何将此代码转换为PostgreSQL存储过程？

1 个答案: