将 0000-00-00 00:00:00 日期时间从 mysql 插入到 postgresql答案

【问题标题】：Insert 0000-00-00 00:00:00 datetime from mysql to postgresql将 0000-00-00 00:00:00 日期时间从 mysql 插入到 postgresql
【发布时间】：2015-10-26 11:25:27
【问题描述】：

我正在尝试从 mysql 数据库转到 postgresql 数据库。我用这个查询创建了一个脚本

 if ($result->num_rows > 0) {
     while($row = $result->fetch_assoc()) { 

     $psql = "INSERT INTO subscriptions_sub (sub_id,cust_id,tarrif_id,des,datetime_created,datetime_modified,credit,credit_limit,status,date_start,date_end,backoffice_userref,backoffice_deleted,backoffice_createdon,backoffice_createdby, backoffice_updatedon,backoffice_updatedby,backoffice_administration,backoffice_readonly,backoffice_order,backoffice_dummy)
    VALUES('" .(int) $row["sub_id"] . "','" . (int) $row["cust_id"] . "','" . (int) $row["tarrif_id"] . "','" . $row["des"] . "','" . $row["datetime_created"] . "','" . $row["datetime_modified"] . "','" . $row["credit"] . "','" . $row["credit_limit"] . "','" . $row["status"] . "','" . $row["date_start"] . "','" . $row["date_end"] . "','" . $row["backoffice_userref"] . "','" . $row["backoffice_deleted"] . "','" . $row["backoffice_createdon"] . "','" . $row["backoffice_createdby"] . "','" . $row["backoffice_updatedon"] . "','" . (int) $row["backoffice_updatedby"] . "','" . (int) $row["backoffice_administration"] . "','" . $row["backoffice_readonly"] . "','" . (int)$row["backoffice_order"] . "','" . $row["backoffice_dummy"] . "');
    ";
    print_r($row);

    $ret = pg_query($db, $psql);
    if(!$ret){
        echo pg_last_error($db);
    } else {
        echo "Records created succesfully\n";
    }

}

这是我的订阅。sub

 _columns = {
    'sub_id': fields.integer('Subscription ID', size=10),
    'cust_id': fields.many2one('res.partner','customer_id', 'Customer ID'),
    'tarrif_id': fields.integer('Tariefplan ID', size=10, required=True),
    'des': fields.char('Description', size=64),
    'datetime_created': fields.datetime('Created', default='0'),
    'datetime_modified': fields.datetime('Modified', default='0'),
    'credit': fields.float('Credit', digits=(10,4)),
    'credit_limit': fields.float('Credit limit', digits=(10,4)),
    'status': fields.selection([('active','Active'),('inactive','Inactive'),('ended','Ended'),('deleted','Deleted'),('disabled','Disabled')], 'Status', default='active', required=True),
    'date_start': fields.date('Date start'),
    'date_end': fields.date('Date end'),
    'backoffice_userref': fields.integer('Backoffice_userref', size=10),
    'backoffice_deleted': fields.boolean('Backoffice_deleted', size=1, default='0', required=True),
    'backoffice_createdon': fields.datetime('Backoffice_createdon', default='0'),
    'backoffice_createdby': fields.integer('Backoffice_createdby', size=10, default='0', required=True),
    'backoffice_updatedon': fields.datetime('Backoffice_updatedon', default='0'),
    'backoffice_updatedby': fields.integer('Backoffice_updatedby', size=10, default='0', required=True),
    'backoffice_administration': fields.integer('Backoffice_administration', size=10, default='1', required=True),
    'backoffice_readonly': fields.boolean('Backoffice_readonly', size=1, default='0', required=True),
    'backoffice_order': fields.integer('Backoffice_order', size=20, default='-1', required=True),
    'backoffice_dummy': fields.boolean('Backoffice_dummy', size=1, default='0', required=True),
    #'qty_available': fields.related('customer_id','subscription_id',type='char', relation="partner.res", string="subscription", store=True)
}

例如：datetime_created 字段在 mysql 数据库中的值为 '0000-00-00 00:00:00'，类型为 TIMESTAMP。
当我执行我的脚本时显示错误：

错误：日期/时间字段值超出范围：“0000-00-00 00:00:00”。

是否可以将日期时间从mysql转换为postgresql？

【问题讨论】：

传递 NULL 而不是 0000-00-00 00:00:00，AFAIK PostgreSQL 不接受 0000-00-00 00:00:00 作为时间戳字段的默认值/空值

标签： php mysql postgresql datetime

【解决方案1】：

create table mytbl1 (dte timestamp);

insert into mytbl1 values (now());
--Query returned successfully: one row affected

insert into mytbl1 values ('0000-00-00 00:00:00');
--ERROR:  date/time field value out of range: "0000-00-00 00:00:00"

因为PostgreSQL不接受0或0000-00-00 00:00:00，所以你可以像下面这样使用NULLIF()函数

insert into mytbl1 
values(NULLIF('0000-00-00 00:00:00','0000-00-00 00:00:00')::timestamp);

所以你应该根据这个安排插入语句

insert into subscriptions_sub(datetime_created) 
values (NULLIF(your_field_name,'0000-00-00 00:00:00')::timestamp)

【讨论】：