Oracle功能麻烦

时间:2012-01-26 12:37:18

标签: oracle plsql

这是fu功能:

create or replace
FUNCTION pk_max_value(t_name VARCHAR) RETURN NUMBER
is
  rws number;
  pk_column_name varchar(300);
  sql_text VARCHAR(2048);
BEGIN

  sql_text := 'SELECT cols.column_name ' || 
          'FROM all_constraints cons, all_cons_columns cols ' ||
          'WHERE cols.table_name = ' || t_name ||
          ' AND cons.constraint_type = ' || 'chr(39) P chr(39) ' ||
          'AND cons.constraint_name = cols.constraint_name ' ||
          'AND cons.owner = cols.owner ' || 
          'ORDER BY cols.table_name, cols.position;';
  execute immediate sql_text into pk_column_name;

  sql_text := 'SELECT MAX(' || pk_column_name || ')  FROM ' || t_name;
  EXECUTE IMMEDIATE sql_text INTO rws;
  RETURN rws;
END;

当我执行此操作时,Oracle给了我一个答案:

  

SQL命令未正确结束。

有人可以告诉我,我的摔倒了吗?

1 个答案:

答案 0 :(得分:3)

首先,sql_text不应以;

结尾

应该是:

sql_text := 'SELECT cols.column_name  
      FROM all_constraints cons, all_cons_columns cols 
      WHERE cols.table_name = '''||t_name||''' 
       AND cons.constraint_type = ''P''
       AND cons.constraint_name = cols.constraint_name 
      AND cons.owner = cols.owner  
      ORDER BY cols.table_name, cols.position';

Obs:当PK类型不是NUMBER时,此函数将失败。

Obs2:t_name应该是大写的......