oracle数据库高级应用之《自动生成指定表的insert，update，delete语句》

/* 2 * 多条记录连接成一条 3 * tableName 表名 4 * type 类型：可以是insert/update/select之一 5 */ 6 create or replace function my_concat(tableName varchar2,type varchar2) 7 return varchar2 8 is 9 type typ_cursor is ref cursor; 10 v_cursor typ_cursor; 11 v_temp varchar2(30); 12 v_result varchar2(4000):= ‘‘; 13 v_sql varchar2(200); 14 begin 15 v_sql := ‘select COLUMN_NAME from user_tab_columns where table_name = ‘‘‘ || upper(tableName) || ‘‘‘ order by COLUMN_ID asc‘; 16 open v_cursor for v_sql; 17 loop 18 fetch v_cursor into v_temp; 19 exit when v_cursor%notfound; 20 if type = ‘select‘ or type = ‘insert‘ then 21 v_result := v_result ||‘,‘ || v_temp; 22 elsif type = ‘update‘ then 23 v_result := v_result ||‘,‘ || v_temp || ‘ = ?‘; 24 elsif type = ‘javabean‘ then 25 v_result := v_result ||‘,bean.get‘ || upper(substr(v_temp,1,1)) || lower(substr(v_temp,2)) || ‘()‘; 26 end if; 27 end loop; 28 return substr(v_result,2); 29 end; 30 31 32 /* 33 * 通过表名自动生成insert/update/select/javabean get方法语句 34 * tableName 表名 35 * type 类型：可以是insert/update/select之一 36 */ 37 create or replace procedure autoGenerateSQL( 38 tableName varchar2, 39 type varchar2, 40 out_result out varchar2 41 ) 42 is 43 sql_insert varchar2(2000); 44 sql_update varchar2(2000); 45 sql_select varchar2(2000); 46 javabean_str varchar2(2000); 47 field_num integer; --字段个数 48 type_info varchar2(20); --参数类型判断信息 49 begin 50 51 sql_insert := ‘insert into ‘ || upper(tableName) || ‘(‘ || my_concat(tableName,type) || ‘) values (‘; 52 sql_update := ‘update ‘ || upper(tableName) || ‘ set ‘; 53 sql_select := ‘select ‘; 54 javabean_str := ‘‘; 55 type_info := ‘‘; 56 57 select count(*) into field_num from user_tab_columns where table_name=upper(tableName); 58 select decode(type,‘insert‘,type,‘update‘,type,‘select‘,type,‘javabean‘,type,‘error‘) into type_info from dual; 59 60 if field_num = 0 then -- 表不存在时 61 out_result := ‘表不存在！请重新输入!‘; 62 elsif type_info = ‘error‘ then --type参数错误时 63 out_result := ‘type参数错误：类型只能是insert、update、select、javabean之一‘; 64 elsif field_num > 0 then 65 if type = ‘insert‘ then --生成insert 语句 66 for i in 1..field_num 67 loop 68 sql_insert := sql_insert || ‘?‘; 69 if i < field_num then 70 sql_insert := sql_insert || ‘,‘; 71 end if; 72 end loop; 73 sql_insert := sql_insert || ‘)‘; 74 out_result := sql_insert; 75 elsif type = ‘update‘ then --生成update 语句 76 sql_update := sql_update || my_concat(tableName,type); 77 out_result := sql_update; 78 elsif type = ‘select‘ then --生成select 语句 79 sql_select := sql_select || my_concat(tableName,type) || ‘ from ‘ || upper(tableName) || ‘ a‘; 80 out_result := sql_select; 81 elsif type = ‘javabean‘ then --生成javabean的get方法 82 javabean_str := my_concat(tableName,type); 83 out_result := javabean_str; 84 end if; 85 end if; 86 87 end autoGenerateSQL; 88 89 declare out_result varchar2(512); 90 begin 91 autoGenerateSQL(‘tf_Employee2‘,‘insert‘, out_result); 92 dbms_output.put_line(out_result); 93 end;

 

oracle数据库高级应用之《自动生成指定表的insert，update，delete语句》

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