例子:select pg_client_encoding(); = "UTF8" 函数:quote_ident(string text)说明:Return the given string suitably quoted to be used as an identifier in an SQL statement string. Quotes are added only if necessary (i.e., if the string contains non-identifier characters or would be case-folded...
$$ language plpgsql; 2、存储过程的对象不可以直接用变量,要用 quote_ident(objVar) 3、$1 $2是 FUNCTION 参数的顺序,如1中的 $1 $2交换,USING 后面的不换 结果 :select max(myTableName) from myFeildname 4、注意:SQL语句中的大写全部会变成小写,要想大写存大,必须要用双引号。 总结: 1. 运行速度...
EXECUTE 'UPDATE tbl SET ' || quote_ident(columnname) || ' = ' || quote_literal(newvalue); 五、控制结构: 1. 函数返回: 1). RETURN expression 该表达式用于终止当前的函数,然后再将expression的值返回给调用者。如果返回简单类型,那么可以使用任何表达式,同时表达式的类型也将被自动 转换成函数的返回类...
select generate_series(cast(percentile_disc[1]*100 as integer),cast(percentile_disc[2]*100 as integer), 1)/100.0::numeric as ix -- 根据数值的最小和最大值生成序列值 from ( SELECT percentile_disc(ARRAY[0.005,0.995]) WITHIN GROUP (ORDER BY ' || quote_ident(current_col ) || ' ) --...
DO $$ DECLARE r RECORD; BEGIN FOR r IN (SELECT tablename FROM pg_tables WHERE schemaname = 'public') LOOP EXECUTE 'GRANT SELECT ON TABLE public.' || quote_ident(r.tablename) || ' TO myuser;'; END LOOP; END $$; 上面的代码块会遍历public模式下的所有表,并为每个表生成并执行一个...
create or replace function test_for_in() returns int as $$ DECLARE cddm record; BEGIN RAISE NOTICE 'reading jcb_cddm...'; FOR cddm IN SELECT * FROM jcb_cddm limit 5 LOOP RAISE NOTICE '场地代码为:%,场地名称为 %', cddm.dm, quote_ident(cddm.mc); END LOOP; return 1; END; $...
|| quote_ident(tabname) || ' WHERE inserted_by = $1 AND inserted <= $2' INTO c USING checked_user, checked_date; 一种更干净的方法是为表名或者列名使用format()的 %I规范(被新行分隔的字符串会被串接起来): EXECUTE format('SELECT count(*) FROM %I ' ...
OPEN curs1 FOR EXECUTE 'SELECT * FROM ' || quote_ident($1); 3). 打开一个绑定的游标 其声明形式为: OPENbound_cursor [ ( argument_values ) ]; 该形式仅适用于绑定的游标变量,只有当该变量在声明时包含接收参数,才能以传递参数的形式打开该游标,这些参数将被实际代入到游标声明的查询语句中,见如下示...
RAISE NOTICE'场地代码为:%,场地名称为 %',cddm.dm,quote_ident(cddm.mc); END LOOP; return1; END; $$ LANGUAGE plpgsql; 数组循环(FOREACH ) FOREACH语法结构如下: [<>]FOREACH target[SLICE number]INARRAY expression LOOP statements END LOOP[label]; ...