Question

如何在oracle中截断所有用户表？我有表约束的问题。

Answer 1

declare

begin

for c1 in (select table_name, constraint_name from user_constraints) loop
    begin
        execute immediate ('alter table '||c1.table_name||' disable constraint '||c1.constraint_name);
    end;
end loop;

for t1 in (select table_name from user_tables) loop
    begin
        execute immediate ('truncate table '||t1.table_name);
    end;
end loop;

for c2 in (select table_name, constraint_name from user_constraints) loop
    begin
        execute immediate ('alter table '||c2.table_name||' enable constraint '||c2.constraint_name);
    end;
end loop;

end;
/

Answer 2

改进了上述脚本，以防您无法删除约束，因为存在依赖关系（以依赖于此约束的外键形式 - ORA-02297。）并通过打印全部（禁用，截断和启用））陈述。

static IEnumerable<QueryResult> GetData(SqlCommand command)
{
    using (var reader = command.ExecuteReader())
    {
        int index = 0;
        do
        {
            while (reader.Read())
            {
                IDictionary<string, object> expando = new ExpandoObject();
                for (int i = 0; i < reader.FieldCount; i++)
                    expando.Add(reader.GetName(i), reader.GetValue(i));
                yield return new QueryResult(index, expando);
            }
            index++;
        }
        while (reader.NextResult());
    }
}

Answer 3

如果您有上述脚本失败的特殊约束，请进行改进：

set serveroutput on;

declare

begin

for c1 in (select y.table_name, y.constraint_name from user_constraints y, user_tables x where x.table_name = y.table_name) loop
    begin
        dbms_output.put_line('alter table '||c1.table_name||' disable constraint '||c1.constraint_name || ';');
        execute immediate  ('alter table '||c1.table_name||' disable constraint '||c1.constraint_name);
    end;
end loop;

for t1 in (select table_name from user_tables) loop
    begin
        execute immediate ('truncate table '||t1.table_name);
    end;
end loop;

for c2 in (select table_name, constraint_name from user_constraints) loop
    begin
        execute immediate ('alter table '||c2.table_name||' enable constraint '||c2.constraint_name);
    end;
end loop;

end;
/

Answer 4

无需变量

begin
  for r in (select table_name from user_tables) loop
    execute immediate 'truncate table ' || r.table_name;
  end loop;
end;

此致 ķ

Answer 5

您可以输出，然后执行您喜欢的那个：

set serveroutput on;

begin

for r in (select table_name from user_tables) loop

    dbms_output.put_line('truncate table ' || r.table_name);

  end loop;

end;

如何截断所有用户表？

5 个答案: