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);
--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
dbms_output.put_line('--当前数据表'||myrecord.TABLE_NAME||'存在字段名为ID，且数据类型为NUMBER的列');
--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;
end if;
end;
end if;
dbms_output.put_line('');
end;
else
exit;
end if;
end loop;
else
dbms_output.put_line('--游标没有打开');
end if;
close mycursor;
dbms_output.put_line('end;');
end;
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