PL/SQL集合(使用自定义类型)
本节主要介绍Oracle PL/SQL集合的迁移语法。迁移语法决定了关键字/功能的迁移方式。
自定义类型(UDT)衍生于数据库支持的数据类型。
自定义数据类型基于内置数据类型和其他自定义数据类型,定义应用程序中数据的结构和行为。自定义类型便于用户使用PL/SQL集合。
UDT表
创建该类型的表,以跟踪用户定义类型的结构。表中不存储任何数据。
输入:CREATE TABLE TYPE
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CREATE <OR REPLACE> TYPE <schema.>inst_no_type IS TABLE OF VARCHAR2 (32767); |
输出
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CREATE TABLE<schema.>mig_inst_no_type ( typ_col VARCHAR2 (32767) ); |
UDT VArray
输入:CREATE VArray
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CREATE TYPE phone_list_typ_demo AS VARRAY(n) OF VARCHAR2(25); |
输出
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CREATE TABLE mig_pone_list_typ_demo ( typ_col VARCHAR2 (25) ); |
声明用户自定义类型
输入:声明用户自定义类型
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DECLARE v_SQL_txt_array inst_no_type <:= inst_no_type()>; BEGIN … |
输出
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DECLARE /* v_SQL_txt_array inst_no_type <:= inst_no_type()>; */ BEGIN EXECUTE IMMEDIATE 'DROP TABLE IF EXISTS v_SQL_txt_array; CREATE LOCAL TEMPORARY TABLE v_SQL_txt_array ON COMMIT PRESERVE ROWS AS SELECT *, CAST(NULL AS INT) AS typ_idx_col FROM mig_inst_no_type WHERE FALSE'; … |
UDT Count
输入:UDT,在FOR LOOP中使用COUNT
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BEGIN ... FOR i IN 1..v_jobnum_list.COUNT LOOP SELECT COUNT(*) INTO v_abc FROM ... WHERE ... AND nvl(t.batch_num, c_batchnum_null_num) = v_jobnum_list(i); ... END LOOP; ... |
输出
BEGIN ... FOR i IN 1..(SELECT COUNT(*) from v_jobnum_list) LOOP SELECT COUNT(*) INTO v_abc FROM ... WHERE ... AND nvl(t.batch_num, c_batchnum_null_num) = (SELECT typ_col FROM v_jobnum_list WHERE typ_idx_col = i); ... END LOOP; ...
UDT记录
记录类型用于创建记录,并且可以在任何PL/SQL块、子程序或包的声明部分中定义。
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Create or Replace Procedure test_proc AS TYPE t_log IS RECORD ( col1 int ,col2 emp.ename % type ) ; fr_wh_SQL t_log ; BEGIN fr_wh_SQL.col1 := 101 ; fr_wh_SQL.col2 := 'abcd' ; DBMS_OUTPUT.PUT_LINE ( fr_wh_SQL.col1 || ',' || fr_wh_SQL.col2 ) ; END test_proc; / |
输出
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Create or Replace Procedure test_proc AS /*TYPE t_log IS RECORD ( col1 int,col2 emp.ename%type );*/ fr_wh_SQL RECORD ; MIG_t_log_col1 int ; MIG_t_log_col2 emp.ename % type ; BEGIN select MIG_t_log_col1 as col1 ,MIG_t_log_col2 as col2 INTO FR_WH_SQL ; fr_wh_SQL.col1 := 101 ; fr_wh_SQL.col2 := 'abcd' ; DBMS_OUTPUT.PUT_LINE ( fr_wh_SQL.col1 || ',' || fr_wh_SQL.col2 ) ; END ; / |
增强用户自定义类型
DSC支持在特定数据类型和任何表字段中增强Oracle中使用的TABLE的PL/SQL类型。
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DECLARE type fr_wh_SQL_info_type is table of VARCHAR(10); fr_wh_SQL fr_wh_SQL_info_type [:= fr_wh_SQL_info_type()]; BEGIN … |
输出
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DECLARE /* type fr_wh_SQL_info_type is table of varchar(10); */ /* fr_wh_SQL fr_wh_SQL_info_type [:= fr_wh_SQL_info_type()]; */ BEGIN EXECUTE IMMEDIATE 'DROP TABLE IF EXISTS mig_fr_wh_SQL_info_type; CREATE LOCAL TEMPORARY TABLE mig_fr_wh_SQL_info_type ( typ_col VARCHAR (10) ) ON COMMIT PRESERVE ROWS' ; EXECUTE IMMEDIATE 'DROP TABLE IF EXISTS fr_wh_SQL; CREATE LOCAL TEMPORARY TABLE fr_wh_SQL ON COMMIT PRESERVE ROWS AS AS SELECT *, CAST(NULL AS INT) AS typ_idx_col FROM mig_fr_wh_SQL_info_type WHERE FALSE'; … |
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DECLARE type fr_wh_SQL_info_type is table of fr_wh_SQL_info.col1%type; fr_wh_SQL fr_wh_SQL_info_type [:= fr_wh_SQL_info_type()]; BEGIN … |
输出
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DECLARE /* type fr_wh_SQL_info_type is table of fr_wh_SQL_info.col1%type; */ /* fr_wh_SQL fr_wh_SQL_info_type [:= fr_wh_SQL_info_type()]; */ BEGIN EXECUTE IMMEDIATE 'DROP TABLE IF EXISTS mig_fr_wh_SQL_info_type; CREATE LOCAL TEMPORARY TABLE mig_fr_wh_SQL_info_type ON COMMIT PRESERVE ROWS AS SELECT col1 AS typ_col FROM fr_wh_SQL_info WHERE FALSE' ; EXECUTE IMMEDIATE 'DROP TABLE IF EXISTS fr_wh_SQL; CREATE LOCAL TEMPORARY TABLE fr_wh_SQL ON COMMIT PRESERVE ROWS AS AS SELECT *, CAST(NULL AS INT) AS typ_idx_col FROM mig_fr_wh_SQL_info_type WHERE FALSE'; … |
EXTEND
GaussDB(DWS)支持EXTEND关键字。
FUNCTION FUNC_EXTEND ( in_str IN VARCHAR2) RETURN ARRYTYPE AS v_count2 INTEGER; v_strlist arrytype; v_node VARCHAR2 (2000); BEGIN v_count2 := 0; v_strlist := arrytype (); FOR v_i IN 1 .. LENGTH (in_str) LOOP IF v_node IS NULL THEN v_node := ''; END IF; IF (v_count2 = 0) OR (v_count2 IS NULL) THEN EXIT; ELSE v_strlist.EXTEND (); v_strlist (v_i) := v_node; v_node := ''; END IF; END LOOP; RETURN v_strlist; END; /
输出
FUNCTION FUNC_EXTEND ( in_str IN VARCHAR2 ) RETURN ARRYTYPE AS v_count2 INTEGER ; v_strlist arrytype ; v_node VARCHAR2 ( 2000 ) ; BEGIN v_count2 := 0 ; v_strlist := arrytype ( ) ; FOR v_i IN 1.. LENGTH( in_str ) LOOP IF v_node IS NULL THEN v_node := '' ; END IF ; IF ( v_count2 = 0 ) OR( v_count2 IS NULL ) THEN EXIT ; ELSE v_strlist.EXTEND ( 1 ) ; v_strlist ( v_i ) := v_node ; v_node := '' ; END IF ; END LOOP ; RETURN v_strlist ; END ; /
RECORD
RECORD类型在包规范中声明但是实际作用于包体。
设置以下参数后,用户自定义数据类型将迁移为VARRY:
plSQLCollection=varray
输入:RECORD
CREATE OR REPLACE FUNCTION func1 (i1 INT) RETURN INT As TYPE r_rthpagat_list IS RECORD (--Record information about cross-border RMB business parameters (rthpagat) rthpagat_REQUESTID RMTS_REMITTANCE_PARAM.REQUESTID%TYPE ,rthpagat_PARAMTNAME RMTS_REMITTANCE_PARAM.PARAMTNAME%TYPE ,rthpagat_PARAMNUM RMTS_REMITTANCE_PARAM.PARAMNUM%TYPE ,rthpagat_PARAMSTAT RMTS_REMITTANCE_PARAM.PARAMSTAT%TYPE ,rthpagat_REQTELLERNO RMTS_REMITTANCE_PARAM.REQTELLERNO%TYPE ,rthpagat_REQUESTTIME RMTS_REMITTANCE_PARAM.REQUESTTIME%TYPE ,rthpagat_HOSTERRNO RMTS_REMITTANCE_PARAM.HOSTERRNO%TYPE ,rthpagat_HOSTERRMSG RMTS_REMITTANCE_PARAM.HOSTERRMSG%TYPE ,rthpagat_GATBANK RMTS_REMITTANCE_PARAM.VALUE1%TYPE ,rthpagat_GATEEBANK RMTS_REMITTANCE_PARAM.VALUE2%TYPE ,rthpagat_TELLER RMTS_REMITTANCE_PARAM.VALUE3%TYPE ,rthpagat_DATE RMTS_REMITTANCE_PARAM.VALUE4%TYPE ,rthpagat_BM_GATBANK RMTS_REMITTANCE_PARAM.VALUE5%TYPE ,rthpagat_BM_GATEEBANK RMTS_REMITTANCE_PARAM.VALUE6%TYPE ,rthpagat_BM_LMTEL RMTS_REMITTANCE_PARAM.VALUE7%TYPE ,rthpagat_BM_LMDAT RMTS_REMITTANCE_PARAM.VALUE8%TYPE ) ; v1 r_rthpagat_list; BEGIN END; /
输出
CREATE TYPE rmts_remitparammgmt_rthpagat.r_rthpagat_list AS (/* O_ERRMSG error description */ Rthpagat_REQUESTID rthpagat_REQUESTID RMTS_REMITTANCE_PARAM.REQUESTID%TYPE ,rthpagat_PARAMTNAME RMTS_REMITTANCE_PARAM.PARAMTNAME%TYPE ,rthpagat_PARAMNUM RMTS_REMITTANCE_PARAM.PARAMNUM%TYPE ,rthpagat_PARAMSTAT RMTS_REMITTANCE_PARAM.PARAMSTAT%TYPE ,rthpagat_REQTELLERNO RMTS_REMITTANCE_PARAM.REQTELLERNO%TYPE ,rthpagat_REQUESTTIME RMTS_REMITTANCE_PARAM.REQUESTTIME%TYPE ,rthpagat_HOSTERRNO RMTS_REMITTANCE_PARAM.HOSTERRNO%TYPE ,rthpagat_HOSTERRMSG RMTS_REMITTANCE_PARAM.HOSTERRMSG%TYPE ,rthpagat_GATBANK RMTS_REMITTANCE_PARAM.VALUE1%TYPE ,rthpagat_GATEEBANK RMTS_REMITTANCE_PARAM.VALUE2%TYPE ,rthpagat_TELLER RMTS_REMITTANCE_PARAM.VALUE3%TYPE ,rthpagat_DATE RMTS_REMITTANCE_PARAM.VALUE4%TYPE ,rthpagat_BM_GATBANK RMTS_REMITTANCE_PARAM.VALUE5%TYPE ,rthpagat_BM_GATEEBANK RMTS_REMITTANCE_PARAM.VALUE6%TYPE ,rthpagat_BM_LMTEL RMTS_REMITTANCE_PARAM.VALUE7%TYPE ,rthpagat_BM_LMDAT RMTS_REMITTANCE_PARAM.VALUE8%TYPE ) ; CREATE OR REPLACE FUNCTION func1 (i1 INT) RETURN INT AS v1 r_rthpagat_list; BEGIN END; /
TYPE命名约定
用户定义的类型允许定义数据类型,以模拟应用程序中数据的结构和行为。
输入
CREATE TYPE t_line AS ( product_line VARCHAR2 ( 30 ) ,product_amount NUMBER ) ; ;
输出
CREATE TYPE sad_dml_product_pkg.t_line AS ( product_line VARCHAR2 ( 30 ) ,product_amount NUMBER ) ;
输入
CREATE TYPE t_line AS ( product_line VARCHAR2 ( 30 ) ,product_amount NUMBER ) ;
输出
CREATE TYPE SAD.sad_dml_product_pkg#t_line AS ( product_line VARCHAR2 ( 30 ) ,product_amount NUMBER ) ;
- 对于第一个输出的pkg.t,如果配置文件中的“pkgSchemaNaming”设置为“true”,则PL RECORD迁移应将包名称作为模式名称以及类型名称。
- 对于第二个输出的pkg #t,假设TYPE属于sad_dml_product_pkg包:
若配置文件中的“pkgSchemaNaming”设置为false,PL RECORD迁移应将模式名称作为模式名称以及包名称+类型名称,以#分隔类型名称。
SUBTYPE
SUBTYPE语句中,PL/SQL允许您定义自己的子类型或预定义数据类型的别名,有时称为抽象数据类型。
输入
CREATE OR REPLACE PACKAGE "SAD"."BAS_SUBTYPE_PKG" IS SUBTYPE CURRENCY IS BAS_PRICE_LIST_T.CURRENCY%TYPE; END bas_subtype_pkg; / CREATE OR REPLACE PACKAGE BODY "SAD"."BAS_SUBTYPE_PKG" IS BEGIN NULL; END bas_subtype_pkg; / --******************************************************************** CREATE OR REPLACE PACKAGE BODY SAD.bas_lookup_misc_pkg IS FUNCTION get_currency(pi_price_type IN NUMBER) RETURN VARCHAR2 IS v_currency bas_subtype_pkg.currency; BEGIN g_func_name := 'get_currency'; FOR rec_currency IN (SELECT currency FROM sad_price_type_v WHERE price_type_code = pi_price_type) LOOP v_currency := rec_currency.currency; END LOOP; RETURN v_currency; END get_currency; END SAD.bas_lookup_misc_pkg; /
输出
CREATE OR REPLACE FUNCTION SAD.bas_lookup_misc_pk#get_currency(pi_price_type IN NUMBER) RETURN VARCHAR2 IS v_currency BAS_PRICE_LIST_T.CURRENCY%TYPE; BEGIN g_func_name := 'get_currency'; FOR rec_currency IN (SELECT currency FROM sad_price_type_v WHERE price_type_code = pi_price_type) LOOP v_currency := rec_currency.currency; END LOOP; RETURN v_currency; END ; /
由于GaussDB(DWS)不支持SUBTYPE,因此使用SUBTYPE变量时,需要将其替换成创建SUBTYPE时使用的实际类型。