将时间戳类型与 pg_prepare 一起使用

Question

运行以下代码：

$preCallMatch = pg_prepare($dbcp, 'callMatch',
                            "SELECT duration 
                               FROM voip_calls 
                              WHERE system_id = $1 
                                AND call_start => $2                                   
                                AND call_start <= $3
                                AND destination = $4");

我收到以下错误：

Warning: pg_prepare(): Query failed: ERROR:  operator does not exist: timestamp without time zone => "unknown"
HINT:  No operator matches the given name and argument type(s). You may need to add explicit type casts. in /home/www/dinesh/UPSReconcileZeroSecondCalls.php on line 38

我尝试以这种方式转换 $2 但没有成功：

$preCallMatch = pg_prepare($dbcp, 'callMatch',
                            "SELECT duration 
                               FROM voip_calls 
                              WHERE system_id = $1 
                                AND call_start => CAST ( $2 AS TIMESTAMP )
                                AND call_start <= CAST ( $3 AS TIMESTAMP )
                                AND destination = $4");


Warning: pg_prepare(): Query failed: ERROR:  operator does not exist: timestamp without time zone => timestamp without time zone
HINT:  No operator matches the given name and argument type(s). You may need to add explicit type casts. in /home/www/dinesh/UPSReconcileZeroSecondCalls.php on line 38

voip_calls 表中的列类型：

call_start     | timestamp without time zone |
call_end       | timestamp without time zone | not null

关于我做错了什么的任何提示？请注意，PDO 或 MDPD 目前不是一个选项。

软件版本：

ii  php5                            5.2.6.dfsg.1-1+lenny3      server-side, HTML-embedded scripting languag
ii  libapache2-mod-php5             5.2.6.dfsg.1-1+lenny3      server-side, HTML-embedded scripting languag
ii  php5-pgsql                      5.2.6.dfsg.1-1+lenny3      PostgreSQL module for php5
ii  libpq5                          8.3.8-0lenny1              PostgreSQL C client library
postmaster (PostgreSQL) 8.1.4

Answer 1

可能是你的 =>导致问题的运算符 - 尝试使用 >= 代替。

另外作为提示，我发现编写 $2::timestamp 而不是 CAST($2 AS TIMESTAMP) 更容易 - 这是 PostgreSQL 特定的语法，但对我来说读起来更好（而且输入更少;-)）

Answer 2

原来是 <= 和 =>运营商。这样做效果很好：

$preCallMatch = pg_prepare($dbcp, 'callMatch',
                            "SELECT duration 
                               FROM voip_calls 
                              WHERE system_id = $1 
                                AND call_start BETWEEN $2 AND $3
                                AND destination = $4");