在PL/pgSQL(PostgreSQL的过程语言)中,RETURN QUERY语句用于从函数中返回一组行,这通常用在返回集合(即多个结果)的函数中。下面我将详细解释你的问题,并提供相应的修改建议。 1. 什么是setof函数? SETOF 函数是PostgreSQL中用于返回集合(即一组行)的函数。这些函数可以返回零行、一行或多行。当函数声明为返回SET...
RETURNQUERY query;RETURNQUERYEXECUTEcommand-string[USING expression [, ...]]; 4|24.1 RETURN QUERY命令 将一条查询的结果追加到一个函数的结果集中。 CREATEORREPLACEFUNCTIONgetAllFoo2()RETURNSSETOF fooAS$$DECLAREr foo%rowtype;BEGINRETURNQUERYSELECT*FROMfooWHEREfooid>0;END$$ LANGUAGE PLPGSQL; 4|34.2...
returnqueryselectroad_number,sum(frequency)fromheat_mapgroupbyroad_number;--这样可以sql :='select road_number, sum(frequency) from heat_map group by road_number';returnquery sql;--这样不行 参考资料: https://blog.csdn.net/victor_ww/article/details/44415895 postgresql自定义类型并返回数组 https:/...
PostgreSQL存储过程（4）-return语句1. return语句 有三个命令可以⽤来从函数中返回数据：RETURN RETURN NEXT RETURN QUERY 2. RETURN命令 语法：RETURN RETURN expression;如果没有使⽤表达式 RETURN命令⽤于告诉这个函数已经完成执⾏了。如果返回标量类型，那么可以使⽤任何表达式.要返回⼀个复合(⾏)数值，...
RETURNQUERYEXECUTESQL 不要这么用 executesqlinto out;returnout;返回多行多列 也有多种方式 1. 使用 return next 和 setof record ，需要 for 循环 CREATEORREPLACEFUNCTIONfuncname ( in_idinteger)RETURNSSETOF RECORDas $$DECLARE v_rec RECORD; BEGINforv_rec...
RETURNQUERYEXECUTESQL 不要这么用 executesqlinto out;returnout; 返回多行多列 也有多种方式 1. 使用 return next 和 setof record ,需要 for 循环 CREATEORREPLACEFUNCTIONfuncname ( in_idinteger)RETURNSSETOF RECORDas $$DECLARE v_rec RECORD; BEGINforv_recin( (selectid , namefromtest_result1where...
Is my code wrong ? Because I try to get some value in DB PostgreSQL but doesn't return errNotFound my err variable still The document you expected this should be explained Expected answer Please return error when record not found from my query. ...
This query was produced using PostgreSQL but, the method is implemented on ActiveRecord's abstract adapters. That means it'll be available for most, if not all, supported databases. Your particular adapter will utilize a CASE statement or a built-in function....
return 1 ?...return 0; 正确形式: return val ?...$message.warning('请选择查询类型') return } this.getRecord() }, getRecord(){} 简化后...: searchQuery() { return this.applyReason == null ?...推荐:js一行If … else … else if语句 1.3K30 你真的了解try{ return }finally{}中的...
The LAYERS table (sde_layers in SQL Server and PostgreSQL) does not exist.SE_FILE_IO_ERROR (-79)An error occurred when creating or writing to an output file.SE_BLOB_SIZE_TOO_LARGE (-80)An attempt was made to store a BLOB that exceeds the maximum allowable size of the ArcSDE server ...