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hank=> select * from tb2;
c1 | c2 | c3
----+-------+----------------------------
1 | hank | 2018-02-06 10:08:00.787503
2 | dazui | 2018-02-06 10:08:08.542481
3 | wahah | 2018-02-06 10:08:15.468527
4 | aaaaa | 2018-02-06 10:18:39.289523
SQL文本如下
cat hank.sql
select * from tb2 where c2=:name and c3>=:time;
通过psql查看
psql -v name="'hank'" -v time="'2018-02-06 10:08:00'" -f hank.sql
c1 | c2 | c3
----+------+----------------------------
1 | hank | 2018-02-06 10:08:00.787503
或者
psql -v name="'hank'" -v time="'2018-02-06 10:08:00'" -c 'i hank.sql'
c1 | c2 | c3
----+------+----------------------------
1 | hank | 2018-02-06 10:08:00.787503
效果一样
2.set使用变量
hank=> set name hank
hank=> set time '2018-02-06 10:09:00'
hank=> select * from tb2 where c2=:'name' and c3>=:'time';
c1 | c2 | c3
----+------+----------------------------
1 | hank | 2018-02-06 10:08:00.787503
3.通过定义参数实现
设置一个session级别的参数，通过current_setting取值
hank=> set session "asasd.time" to "2018-02-06 10:09:00";
SET
hank=> select * from tb2 where c3 >= current_setting('asasd.time')::timestamp;
c1 | c2 | c3
----+-------+----------------------------
4 | aaaaa | 2018-02-06 10:18:39.289523
(1 row)
补充：postgresql存储函数/存储过程用sql语句来给变量赋值
--定义变量
a numeric;
方式一：
1select sqla into a from table1 where b = '1' ; --这是sql语句赋值
方式二：
sql1:= 'select a from table1 where b = ' '1' ' ';
execute sql1 into a; --这是执行存储函数赋值 （编辑：宣城站长网）
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