oracle的存储过程实现字段类型的替换

end convert_date_to_timestamp;

create or replace procedure convert_number_to_decimal
/**************************
function: 将数据库中所有的表中含DATE类型的字段改为TIMESTAMP类型；
需要建立下列类型表：
create table type_table_info (
table_name varchar2(30),
data_type varchar2(100)
)
***************************/
is
v_query_base_sql varchar2(100) := 'SELECT table_name,data_type FROM all_tab_cols WHERE table_name = ''';
v_query_table_sql varchar2(150);
v_alter_sql varchar2(100);


type table_type is table of type_table_info%rowtype;
table_array table_type;


begin
for c_tabs in (
select table_name from user_tables where table_name <> 'type_table_info'
)
loop
v_query_table_sql := v_query_base_sql || c_tabs.table_name || '''';
execute immediate v_query_table_sql bulk collect into table_array;
for i in table_array.first .. table_array.last
loop
--DBMS_OUTPUT.put_line(table_array(i).column_name || ':' || table_array(i).data_type);
if table_array(i).data_type = 'NUMBER' then
v_alter_sql := 'alter table ' || table_array(i).table_name || ' modify ' || table_array(i).column_name || ' decimal(65)';
DBMS_OUTPUT.put_line(table_array(i).column_name || ': ' || v_alter_sql);
execute immediate v_alter_sql;
end if;


end loop;
end loop;
end convert_numbr_to_decimal;

create or replace procedure convert_varchar2_to_varchar /************************** function: 将数据库中所有的表中含DATE类型的字段改为TIMESTAMP类型； 需要建立下列类型表： create table type_table_info ( table_name varchar2(30),column_name varchar2(30),data_type varchar2(100) ) ***************************/ is v_query_base_sql varchar2(100) := 'SELECT table_name,data_type FROM all_tab_cols WHERE table_name = '''; v_query_table_sql varchar2(150); v_alter_sql varchar2(100); type table_type is table of type_table_info%rowtype; table_array table_type; begin for c_tabs in ( select table_name from user_tables where table_name <> 'type_table_info' ) loop v_query_table_sql := v_query_base_sql || c_tabs.table_name || ''''; execute immediate v_query_table_sql bulk collect into table_array; for i in table_array.first .. table_array.last loop --DBMS_OUTPUT.put_line(table_array(i).column_name || ':' || table_array(i).data_type); if table_array(i).data_type = 'VARCHAR2(200)' then v_alter_sql := 'alter table ' || table_array(i).table_name || ' modify ' || table_array(i).column_name || ' VARCHAR2(500)'; DBMS_OUTPUT.put_line(table_array(i).column_name || ': ' || v_alter_sql); execute immediate v_alter_sql; end if; end loop; end loop; end convert_varchar2_to_varchar;

（编辑：李大同）

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