Question

我正在使用rails 3，我需要在我的一个迁移中执行原始sql，我需要使用预准备语句来执行它，因为它是避免由于单个，语句等引起的问题的最佳方法。有没有办法可以在一个prepare语句中执行多个sql语句。我正在使用PostgreSQL作为我的数据库

这是我尝试的代码

  CONN = ActiveRecord::Base.connection.raw_connection  
  sql = %Q[
            INSERT INTO table1 
              (
                name,
                email,
                phone,
                created_at,
                updated_at
               ) 
              VALUES 
              (
                $1, 
                $2, 
                $3,
                current_timestamp, 
                current_timestamp
              );
            UPDATE table2 
              SET column_1 = $1
              WHERE id = $4;
            UPDATE contacts SET 
              column_2 = $2
              WHERE id = $4
          ]

  CONN.prepare('insert_and_update', sql)
  CONN.exe_prepared('insert_and_update', [
      name,
      email,
      phone,
      customer.id
    ])

但我收到错误

 cannot insert multiple commands into a prepared statement

Answer 1

将其变为单个命令：

with i as (
    insert into table1 (
        name,
        email,
        phone,
        created_at,
        updated_at
    ) values (
        $1, 
        $2, 
        $3,
        current_timestamp, 
        current_timestamp
), u as (
    update table2 
    set column_1 = $1
    where id = $4
)
update contacts 
set column_2 = $2
where id = $4
;

将多个命令插入准备好的语句轨道中

1 个答案: