表名和列名这样的标识符应该传给函数quote_ident,普通字符串常量应该传给函quote_literal,例如: EXECUTE 'UPDATE tbl SET ' || quote_ident(colname) || ' = ' || quote_literal(newvalue) || ' WHERE key = ' || quote_literal(keyvalue); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 4.5 ...
1.在标准的PLSQL中定义变量是不能用VARIABLE关键字的,此关键字只在SQLPLUS执行环境中有效, 可使用PRINT语句输出变量内容。 2.在PLSQL中使用这种变量时,前面加”:”, 以示区分。 DBMS_OUTPUT.PUT_LINE()介绍 在接下来的实验中,经常需要在调试程序时输出中间变量的值 DECLARE v_sal NUMBER(9,2) := &p_annua...
SELECT INTO — 从一个查询的结果中定义一个新表 SET — 改变运行时参数 SET CONSTRAINTS — 设置当前事务的约束检查模式 SET ROLE — set the current user identifier of the current session SET SESSION AUTHORIZATION — 为当前会话设置会话用户标识符和当前用户标识符 SET TRANSACTION — 设置当前事务的特性 SH...
CREATE[ORREPLACE]FUNCTIONname([[argmode][argname]argtype[{DEFAULT|=}default_expr][,...]])[RETURNSrettype|RETURNSTABLE(column_name column_type[,...])]{LANGUAGElang_name|TRANSFORM{FORTYPEtype_name}[,...]|WINDOW|IMMUTABLE|STABLE|VOLATILE|[NOT]LEAKPROOF|CALLEDONNULLINPUT|RETURNSNULLONNULLINPUT|...
(RangeFunction); n->lateral = false; n->ordinality = $6; n->is_rowsfrom = true; n->functions = $4; /* alias and coldeflist are set by table_ref production */ $$ = (Node *) n; } ; rowsfrom_item: func_expr_windowless opt_col_def_list { $$ = list_make2($1, $2); ...
$2' INTO c USING checked_user, checked_date; EXECUTE format('SELECT count(*) FROM %I ' 'WHERE inserted_by = $1 AND inserted <= $2', tabname) INTO c USING checked_user, checked_date; EXECUTE format('UPDATE tbl SET %I = %L ' 'WHERE key = %L', colname, newvalue, keyvalue)...
DO $body$ DECLARE SIZES_VALUE varchar(1000); MEASUREMENT_TEMPLATE RECORD; BEGIN FOR MEASUREMENT_TEMPLATE IN (SELECT ID FROM CNT_MEASUREMENT_TEMPLATE WHERE DOMAIN_ID IN ('/','RD1','RD2') AND IS_LATEST = TRUE AND (SIZES IS NULL OR SIZES = '')) LOOP --- split sizes value from CNT_...
DO$$DECLAREiinteger:=3;BEGINCASEWHENiBETWEEN0AND10THENRAISENOTICE'value is between zero and ten';WHENiBETWEEN11AND20THENRAISENOTICE'value is between eleven and twenty';ELSERAISENOTICE'other value';ENDCASE;END$$; 搜索CASE 表达式可以构造任意复杂的判断逻辑,实现 IF 语句的各种功能。
/* * End of Handle declaration */ /* * Declare local variables, */ text *username = (text *) "parallels"; text *passwd = (text *) ""; /* * Oracle Instant Client Connection String */ text *server = (text *) "//localhost:5432/postgres"; /* * Initialize and Allocate handles *...
RETURN with an expression terminates the function and returns the value of expression to the caller. This form is used for PL/pgSQL functions that do not return a set. In a function that returns a scalar type, the expression’s result will automatically be cast into the ...