很多人都知道在Oracle中并沒有像其他數據庫中的自增字段，那么我們怎樣才能實現Oracle的自增字段功能呢？下面我們通過Oracle中的Sequence和Trigger來實現此功能。1、首先建立一個創建自增字段的存儲過程//Written by Sun Zhenfang 20040903 create or replace PRocedure pr_CreateIdentityColumn (tablename varchar2,columnname varchar2) as strsql varchar2(1000); begin strsql := 'create sequence seq_'tablename' minvalue 1 maxvalue 999999999999999999 start with 1 increment by 1 nocache'; execute immediate strsql; strsql := 'create or replace trigger trg_'tablename' before insert on 'tablename' for each row begin select seq_'tablename'.nextval into :new.'columnname' from dual; end;'; execute immediate strsql; end;2、Oracle中執行動態SQL時要顯示授權（即使該用戶擁有該相關權限）GRANT CREATE ANY SEQUENCE TO "UserName"; GRANT CREATE ANY TRIGGER TO "UserName";（注重：數據庫用戶名區分大小寫）3、重新Compile存儲過程pr_CreateIdentityColumn4、搞定，下面我們就可以用這個存儲過程建立自增自段了。5、調用存儲過程建立自增字段（Note: 第一個參數是表名，第二個參數為自增字段的名字）exec pr_createidentitycolumn('sdspdept','deptid'); exec pr_createidentitycolumn('sdspuser','userid'); exec pr_createidentitycolumn('sdspsysrole','sysroleid'); exec pr_createidentitycolumn('sdspfp','sysfpid'); exec pr_createidentitycolumn('sdspphasemodel','phasemodelid'); exec pr_createidentitycolumn('sdspphase','phaseid'); ... ...
