declare r record; begin OLD.id := OLD.id+1; NEW.id := NEW.id+1; select 1 as id into r; raise notice '%, old.id:%. new.id:%', TG_NAME, OLD.id, NEW.id; return r; end; language plpgsql; CREATE FUNCTION postgres=#
这里的transformTopLevelStmt、transformStmt、transformSelectStmt、transformTargetList、transformTargetList、transformExpr、transformExprRecurse、transformFuncCall都是进行转化的,而ParseFuncOrColumn函数的功能是详细寻找函数,而make_const是对参数进行处理的。 以下图来详细说明ParseFuncOrColumn的工作原理: (1)ParseFuncOr...
column? --- t 数组相关函数 array_dims - 返回array的维度,返回文本类型 array_lower - 返回数组某一维度的下界 array_upper - 返回数组某一维度的上界 array_length - 返回数组某一维度的长 cardinality - 返回数组的元素个数,统计所有维度 mydb=# SELECT array_dims(schedule) FROM sal_emp; array_dim...
PostgreSQL 10 pg_read_all_settings pg_read_all_stats pg_stat_scan_tables pg_monitor PostgreSQL9.6只有一个系统角色: pg_signal_backend PostgreSQL 11 版本的psql中增加了命令\gdesc可以查看执行结果的数据类型:osdba=# select * from test01 \gdesc Column | Type ---+--- id | integer id2 | integ...
groups:product:products:"where id = {1}"reviews:"where product_id = {1}"coupons:"where product_id = {1} order by created_at desc limit 10"stores:"where id in (select store_id from products where id = {1})" And run: pgsync product:123 ...
def executeTable(self,tablename,count):#print tablenamesql1="SELECT * FROM %s"%tablenameprint(sql1) mscursor=self.msconn.cursor() mscursor.execute(sql1) table=mscursor.fetchall()if(table is None or len(table)<=0): mscursor.close()returnlst_result=self.initColumn(table)#print "column...
{NodeTagtype;RangeVar*relation;/* the relation to copy */Node*query;/* the query (SELECT or DML statement with* RETURNING) to copy, as a raw parse tree */List*attlist;/* List of column names (as Strings), or NIL* for all columns */boolis_from;/* TO or FROM */boolis_program...
INSERTINTOdest (col)SELECTfoo+barFROMsrc; Here, dest and src must be table names, and col must be a column of dest, but foo and bar might reasonably be either variables of the function or columns of src. By default, PL/pgSQL will report an error if a name in a SQL statement could...
SELECT * INTO myrec FROM emp WHERE empname = myname; IF NOT FOUND THEN RAISE EXCEPTION 'employee % not found', myname; END IF; If the STRICT option is specified, the query must return exactly one row or a run-time error will be reported, either NO_DATA_FOUND (no rows) or TOO...
SELECT 1 AS column1, 'one' AS column2 UNION ALL SELECT 2, 'two' UNION ALL SELECT 3, 'three'; 1. 2. 3. 4. 5. More usually, VALUES is used within a larger SQL command. The most common use is in INSERT: INSERT INTO films (code, title, did, date_prod, kind) ...