说明：
为了让CYQ.Data 框架支持Oracle，这几天对Oracle进行了基本探索，并把中间遇到的问题轻轻的记录了下来,与大伙共享。
总共有三篇：
3：就是本篇了：折腾Oracle问题小菜记(三)
本篇又有新突破，再记录一下：
1：自己写了一条分页存储过程，也是CYQ.Data默认产生的存储过程：
create or replace package MyPackage as
type MyCursor is ref cursor;
procedure SelectBase(pageIndex int,pageSize int,tableName varchar2,whereStr varchar2,
resultCount out int, resultCursor out MyCursor);
end MyPackage;
create or replace package Body MyPackage is
procedure SelectBase(pageIndex int,pageSize int,tableName varchar2,whereStr varchar2,
resultCount out int, resultCursor out MyCursor)
is
--定义变量
newtableName varchar2(4000);
rowStart int;
rowEnd int;
mySql varchar2(8000);
whereOnly varchar2(8000);
OrderOnly varchar2(400);
begin
newtableName:=tableName;
mySql:='select count(*) from '||tableName;
if whereStr is not null and length(whereStr)>0
then
rowStart:=instr(whereStr,'order by');
if rowStart>0
then
whereOnly:=substr(whereStr, 1,rowStart-1); --取得条件
OrderOnly:=substr(whereStr,rowStart, length(whereStr)-rowStart+1); --取得排序方式(order by 字段 方式)
else
whereOnly:=whereStr;
OrderOnly:='';
end if;
whereOnly:=' where '|| whereOnly;
mySql:=mySql||whereOnly;
end if;
execute immediate mySql into resultCount;
-- dbms_output.put_line('查询总条数SQL=>'||whereStr||'--'||mySql||resultCount);
--执行查询,查询总条数
--不分页查所有
if pageIndex=0 and pageSize=0
then
mySql:='select * from '||tableName||whereOnly||OrderOnly;
else
--计算起始和结束索引
rowStart:=(pageIndex-1)*pageSize+1;
rowEnd:=rowStart+pageSize-1;
mySql:='select * from (select t.*,RowNum as rn from (select * from '||newtableName||whereOnly||OrderOnly||') t) where rn between '||rowStart||' and '||rowEnd;
end if;
open ResultCursor for mySql;
--dbms_output.put_line('SQL=>'||mySql);
end SelectBase;
end MyPackage;
type MyCursor is ref cursor;
procedure SelectBase(pageIndex int,pageSize int,tableName varchar2,whereStr varchar2,
resultCount out int, resultCursor out MyCursor);
end MyPackage;
create or replace package Body MyPackage is
procedure SelectBase(pageIndex int,pageSize int,tableName varchar2,whereStr varchar2,
resultCount out int, resultCursor out MyCursor)
is
--定义变量
newtableName varchar2(4000);
rowStart int;
rowEnd int;
mySql varchar2(8000);
whereOnly varchar2(8000);
OrderOnly varchar2(400);
begin
newtableName:=tableName;
mySql:='select count(*) from '||tableName;
if whereStr is not null and length(whereStr)>0
then
rowStart:=instr(whereStr,'order by');
if rowStart>0
then
whereOnly:=substr(whereStr, 1,rowStart-1); --取得条件
OrderOnly:=substr(whereStr,rowStart, length(whereStr)-rowStart+1); --取得排序方式(order by 字段 方式)
else
whereOnly:=whereStr;
OrderOnly:='';
end if;
whereOnly:=' where '|| whereOnly;
mySql:=mySql||whereOnly;
end if;
execute immediate mySql into resultCount;
-- dbms_output.put_line('查询总条数SQL=>'||whereStr||'--'||mySql||resultCount);
--执行查询,查询总条数
--不分页查所有
if pageIndex=0 and pageSize=0
then
mySql:='select * from '||tableName||whereOnly||OrderOnly;
else
--计算起始和结束索引
rowStart:=(pageIndex-1)*pageSize+1;
rowEnd:=rowStart+pageSize-1;
mySql:='select * from (select t.*,RowNum as rn from (select * from '||newtableName||whereOnly||OrderOnly||') t) where rn between '||rowStart||' and '||rowEnd;
end if;
open ResultCursor for mySql;
--dbms_output.put_line('SQL=>'||mySql);
end SelectBase;
end MyPackage;
执行测试语句：
declare
ResultCursor MyPackage.MyCursor;
ResultCount int;
begin
MyPackage.SelectBase(1,2,'USERS','id>1 order by id',ResultCount,ResultCursor);
end;
ResultCursor MyPackage.MyCursor;
ResultCount int;
begin
MyPackage.SelectBase(1,2,'USERS','id>1 order by id',ResultCount,ResultCursor);
end;
说明：
为写这段存储过程历经了半天，需要看语法，又要调试，最后采用步步注释法才一条语句一条语句的写到最后。
测试调试也弄了半天，要定义游标传进去才行。
测试调试也弄了半天，要定义游标传进去才行。
继续说明：
Oracle里的存储过程的可以有Package，等于一个名称空间了。
存储过程的代码里面有几个小问题，oracle->比较->mssql：
1：|| 为链接符号即+号
2：instr 函数和sql的函数charindex函数一样,只是里面的头两个参数的顺序要反过来。
3：substr函数和sql的函数substring函数一样。
4：length函数和sql的函数len函数一样。
5：if ...then...else end if, mssql里为 if begin end
6：“;"号一行语句一个，mssql里没有。
存储过程的代码里面有几个小问题，oracle->比较->mssql：
1：|| 为链接符号即+号
2：instr 函数和sql的函数charindex函数一样,只是里面的头两个参数的顺序要反过来。
3：substr函数和sql的函数substring函数一样。
4：length函数和sql的函数len函数一样。
5：if ...then...else end if, mssql里为 if begin end
6：“;"号一行语句一个，mssql里没有。
2：数据库表/视图的字段结构查询：
select COLUMN_NAME as ColumnName,
Data_length*2 as MaxSize,
case NULLABLE when 'Y' then 1 else 0 end as IsNullable,
0 as ReadOnly,
DATA_TYPE as SqlType
from USER_TAB_COLS where TABLE_NAME=upper(:TableName) order by COLUMN_ID
Data_length*2 as MaxSize,
case NULLABLE when 'Y' then 1 else 0 end as IsNullable,
0 as ReadOnly,
DATA_TYPE as SqlType
from USER_TAB_COLS where TABLE_NAME=upper(:TableName) order by COLUMN_ID
3：存储过程参数放在另一个表，独立查询：
select argument_Name as ColumnName,-1 as MaxSize,0 as IsNullable,0 as ReadOnly,'int' as SqlType from user_arguments where object_name=upper(:TableName)
4：查询所有表/视图/存储过程
Select object_name From user_objects Where object_type='TRIGGER'; --所有触发器
Select object_name From user_objects Where object_type='PROCEDURE'; --所有存储过程
Select object_name From user_objects Where object_type='VIEW'; --所有视图
Select object_name From user_objects Where object_type='TABLE'; --所有表
Select object_name From user_objects Where object_type='PROCEDURE'; --所有存储过程
Select object_name From user_objects Where object_type='VIEW'; --所有视图
Select object_name From user_objects Where object_type='TABLE'; --所有表
版权声明：本文原创发表于博客园，作者为路过秋天，原文链接：
http://www.cnblogs.com/cyq1162/archive/2010/09/28/1837692.html