应用场合：数据表新增自增一主键能加快数据表的访问速度，而且是整形的索引速度最快。本程序适合在导入Oracle数据库时删除不存在主键的情况下运行。
代码说明：所有的表主键字段名都设置为ID,如果已存在ID字段，则判断是否是整形，如果不是就重命名字段为[表名ID]，然后新增ID，，如果不存在则直接添加自增一ID的主键
操作说明：打开PQSQL连接数据库后直接执行下面的详细脚本代码运行即可，脚本有风险(会删除原来的索引跟主键约束)，请不要轻易在正式运行的数据库上直接执行
–Oracle使用游标为所有用户表创建主键语句
–参考语句如下：
–查询所有主键约束select * from user_constraints
–查询所有序列select * from user_sequences;
–查询所有触发器select * from user_triggers;
–查询触发器的用户select distinct(table_owner) from user_triggers;
declare
addstring NVARCHAR2(2000):=’ ‘; –定义添加字段变量
renamestring NVARCHAR2(2000):=’ ‘; –定义重命名字段变量
tablestring NVARCHAR2(2000):=’ ‘; –定义序列变量
keyidname NVARCHAR2(255):=’ID’; –定义主键字段名变量
tableidname NVARCHAR2(255):=’ ‘; –定义新的字段名变量
trigerstring NVARCHAR2(2000):=’ ‘; –定义创建触发器字符串变量
trgname NVARCHAR2(255):=’ ‘; –定义触发器名称变量
seqstring NVARCHAR2(2000):=’ ‘; –定义创建序列字符串变量
seqname NVARCHAR2(255):=’ ‘; –定义序列名称变量
pkname NVARCHAR2(255):=’ ‘; –定义主键索引名称变量
constring NVARCHAR2(2000):=’ ‘; –定义索引变量
notnullstring NVARCHAR2(2000):=’ ‘; –定义主键不为空变量
cursor mycursor is select * from user_tables where TABLESPACE_NAME=’SZGABL’ ORDER BY TABLE_NAME; –定义游标获取所所有用户数据表名称
myrecord mycursor%rowtype; –定义游标记录类型
CounterName int :=0; –定义是否存在对应的列名变量
CounterData int :=0; –定义是否存在对应的数据类型
begin
dbms_output.put_line(‘declare counter int :=0;begin ‘);
open mycursor; –打开游标
if mycursor%isopen then –判断打开成功
loop –循环获取记录集
fetch mycursor into myrecord; –获取游标中的记录
if mycursor%found then –游标的found属性判断是否有记录
begin
–获取有效的数据表名
select replace(myrecord.TABLE_NAME,’TB_’,”) into tablestring from dual;
select ‘SEQ_’||tablestring into seqname from dual;
select ‘TRG_’||tablestring into trgname from dual;
select ‘PK_’||tablestring into pkname from dual;
select tablestring||UPPER(keyidname) into tableidname from dual;
–判断当前数据表是否包含字段名为ID的列
SELECT COUNT(*) INTO CounterName FROM dual WHERE EXISTS(SELECT * FROM user_tab_cols WHERE LOWER(COLUMN_NAME)=LOWER(keyidname) and TABLE_NAME=myrecord.TABLE_NAME);
if CounterName=0 then
begin
dbms_output.put_line(‘–当前数据表’||myrecord.TABLE_NAME||’不存在字段名为ID的列’);
–添加主键字段
addstring:=’execute immediate ”alter table ‘||myrecord.TABLE_NAME||’ add ‘||keyidname||’ NUMBER”;’;
dbms_output.put_line(addstring);
–execute immediate addstring;
–创建一个序列
seqstring:=’select count(*) into counter from dual where exists(select * from user_sequences where sequence_name=”’||seqname||”’);if counter>0 then execute immediate ”drop sequence ‘||seqname||”’; end if; execute immediate ” create sequence SEQ_’||tablestring||’ INCREMENT BY 1 START WITH 1 NOMAXVALUE NOCYCLE NOCACHE”;’;
dbms_output.put_line(seqstring);
–execute immediate seqstring;
–创建一个触发器
trigerstring:=’select count(*) into counter from dual where exists(select * from user_triggers where trigger_name=”’||trgname||”’);if counter>0 then execute immediate ”drop trigger ‘||trgname||”’; end if; execute immediate ” create trigger TRG_’||tablestring||’ BEFORE INSERT ON ‘||myrecord.TABLE_NAME||’ FOR EACH ROW WHEN (new.’||keyidname||’ is null) begin select ‘||seqname||’.nextval into: new.’||keyidname||’ from dual; end”;’;
dbms_output.put_line(trigerstring);
–execute immediate trigerstring;
–添加主键约束
constring:=’select count(*) into counter from dual where exists(select * from user_constraints where constraint_name=”’||pkname||”’);if counter>0 then execute immediate ”drop constraint ‘||pkname||”’; end if; execute immediate ”alter table ‘||myrecord.TABLE_NAME||’ add constraint ‘||pkname||’ primary key(‘||keyidname||’)”;’;
dbms_output.put_line(constring);
–execute immediate constring;
–更新主键不为空
notnullstring:=’select count(*) into counter from dual where exists(select * from user_tab_cols where table_name=”’||myrecord.TABLE_NAME||”’ and column_name=”’||keyidname||”’ AND NULLABLE=”Y” );if counter>0 then execute immediate ”alter table ‘||myrecord.TABLE_NAME||’ modify ‘||keyidname||’ not null”; end if;’;
dbms_output.put_line(notnullstring);
–execute immediate notnullstring;
end;
else
begin
–判断当前数据表是否包含字段名为ID且数据类型为NUMBER
SELECT COUNT(*) INTO CounterData FROM dual WHERE EXISTS(SELECT * FROM user_tab_cols WHERE LOWER(COLUMN_NAME)=LOWER(keyidname) AND DATA_TYPE=’NUMBER’ and TABLE_NAME=myrecord.TABLE_NAME);
if CounterData=0 then
begin
dbms_output.put_line(‘–当前数据表’||myrecord.TABLE_NAME||’存在字段名为ID，但数据类型不为NUMBER的列’);
–先重命名字段，然后添加主键字段
renamestring:=’execute immediate ”alter table ‘||myrecord.TABLE_NAME||’ rename column ‘||keyidname||’ to ‘||tableidname||”’;’;
dbms_output.put_line(renamestring);
–execute immediate renamestring;
–添加主键字段
addstring:=’execute immediate ”alter table ‘||myrecord.TABLE_NAME||’ add ‘||keyidname||’ NUMBER”;’;
dbms_output.put_line(addstring);