对PLSQL中的每个表执行 [英] Execute For Each Table in PLSQL

问题描述

我想要所有表中符合特定名称条件的记录数.这是我建立的SQL

I want to the the number of records in all tables that match a specific name criteria. Here is the SQL I built

Declare SQLStatement VARCHAR (8000) :='';
BEGIN
  SELECT 'SELECT COUNT (*) FROM ' || Table_Name || ';'
  INTO SQLStatement
  FROM All_Tables
  WHERE 1=1
    AND UPPER (Table_Name) LIKE UPPER ('MSRS%');

  IF SQLStatement <> '' THEN
    EXECUTE IMMEDIATE SQLStatement;
  END IF;
END;
/

但是出现以下错误:

Error at line 1
ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at line 3
Script Terminated on line 1.

我如何修改它以便它可以在所有匹配的表中运行?

How do I modify this so that it runs for all matching tables?

更新:

根据收到的答案，我尝试了以下操作，但在DBMS_OUTPUT中什么都没得到

Based on an answer received, I tried the following but I do not get anything in the DBMS_OUTPUT

declare 
  cnt number;
begin
  for r in (select table_name from all_tables) loop
    dbms_output.put_line('select count(*) from CDR.' || r.table_name);
  end loop;
end;
/

推荐答案

declare 
  cnt number;
begin
  for r in (select owner, table_name from all_tables
             where upper(table_name) like ('%MSRS%')) loop

    execute immediate 'select count(*) from "'
            || r.owner || '"."'
            || r.table_name || '"'
            into cnt;

    dbms_output.put_line(r.owner || '.' || r.table_name || ': ' || cnt);
  end loop;
end;
/

如果您要从 all_tables 中进行选择，则不能指望获得从表名中进行选择所必需的授予.因此，您应该检查是否出现 ORA-00942:表或视图不存在错误.

If you're selecting from all_tables you cannot count on having been given the grants necessary to select from the table name. You should therefore check for the ORA-00942: table or view does not exist error thrown.

关于错误原因:之所以会出现此错误，是因为select语句返回的结果集包含多行(每个表一个)，并且您无法将这样的结果集分配给varchar2.

As to the cause for your error: You get this error because the select statement returns a result set with more than one row (one for each table) and you cannot assign such a result set to a varchar2.

在执行此块之前，请确保在 SET SERVEROUT ON 上启用dbms_output.

By the way, make sure you enable dbms_output with SET SERVEROUT ON before executing this block.

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