使用dbms_metadata生成建表语句（r2笔记97天)

有时候在工作中，可以使用exp/imp得到表的创建语句。 如果想得到关于table,index,constraint的语句，可以考虑使用dbms_metadata来实现。 我们可以使用如下的脚本来得到建表语句，对应的索引语句，和ref_constraint语句。 建表语句就不多说了,关于索引的部分，过滤了主键和唯一性索引的部分，这些语句会和建表语句中的constraint有一定的冲突，而foreign key的语句在建表语句中也不建议使用，这样会对其他表产生依赖，可以考虑单独生成这部分的语句，最后执行。 所以整个脚本会分为3个部分，建表语句，创建索引的语句和ref_constraint的部分。 sqlplus -s n1/n1 <<EOF SET SERVEROUTPUT ON; SET LINESIZE 500; SET FEEDBACK OFF; set long 99999999 ; SET PAGESIZE 1000 ; set head off; EXEC DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'STORAGE',false); EXEC DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'PRETTY',true); EXEC DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'SQLTERMINATOR',true); EXEC DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'TABLESPACE',true); EXEC DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'SEGMENT_ATTRIBUTES',false); EXEC DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'REF_CONSTRAINTS',false); spool image_copy_$1.sql select 'select DBMS_METADATA.GET_DDL('||chr(39)||'TABLE'||chr(39)||','||chr(39)||table_name||chr(39)||','||chr(39)||owner||chr(39)||') sql_text from dual; 'FROM all_tables where owner=sys_context('USERENV','current_user') and table_name =upper('$1'); spool off; col sql_text format a300 spool image_copy_$1.log @image_copy_$1.sql spool off

spool ref_constraint_$1.sql select 'select DBMS_METADATA.GET_DDL('||chr(39)||'REF_CONSTRAINT'||chr(39)||','||chr(39)||constraint_name||chr(39)||','||chr(39)||owner||chr(39)||') sql_text from dual; 'FROM all_constraints where owner=sys_context('USERENV','current_user') and table_name =upper('$1') and constraint_type='R'; spool off; col sql_text format a300 spool ref_constraint_$1.log @ref_constraint_$1.sql spool off spool index_$1.sql select 'select DBMS_METADATA.GET_DDL('||chr(39)||'INDEX'||chr(39)||','||chr(39)||index_name||chr(39)||','||chr(39)||owner||chr(39)||') sql_text from dual;'FROM all_indexes where owner=sys_context('USERENV','current_user') and table_name =upper('$1') and index_name in ( select index_name from user_indexes where table_name='$1' and index_name not in (select constraint_name from user_constraints where constraint_type in ('P','U' ) and UNIQUENESS='UNIQUE') union select index_name from user_indexes where table_name='$1' and index_name in (select constraint_name from user_constraints where constraint_type='C' ) and UNIQUENESS='NONUNIQUE' ); spool off; col sql_text format a300 spool index_$1.log @index_$1.sql spool off EOF

运行脚本得到一个简单的例子。 CREATE TABLE "N1"."PM9_CRDT_LMT_NOTIFICATION" ( "CYCLE_CODE" NUMBER(2,0) DEFAULT 0 CONSTRAINT "PM9CRDLT_CYCLE_CODE_NN" NOT NULL ENABLE, "CYCLE_MONTH" NUMBER(2,0) CONSTRAINT "PM9CRDLT_CYCLE_MONTH_NN" NOT NULL ENABLE, "SYS_CREATION_DATE" DATE CONSTRAINT "PM9CRDLT_SYS_CREATION_DATE_NN" NOT NULL ENABLE, "SYS_UPDATE_DATE" DATE, "OPERATOR_ID" NUMBER(9,0), "APPLICATION_ID" CHAR(6), "DL_SERVICE_CODE" CHAR(5), "DL_UPDATE_STAMP" NUMBER(4,0), "CYCLE_YEAR" NUMBER(4,0) CONSTRAINT "PM9CRDLT_CYCLE_YEAR_NN" NOT NULL ENABLE, "CUSTOMER_ID" NUMBER(9,0) CONSTRAINT "PM9CRDLT_CUSTOMER_ID_NN" NOT NULL ENABLE, "AGREEMENT_ID" NUMBER(9,0) CONSTRAINT "PM9CRDLT_AGREEMENT_ID_NN" NOT NULL ENABLE, "OFFER_INSTANCE" NUMBER(9,0) CONSTRAINT "PM9CRDLT_OFFER_INSTANCE_NN" NOT NULL ENABLE, "ITEM_ID" NUMBER(9,0) CONSTRAINT "PM9CRDLT_ITEM_ID_NN" NOT NULL ENABLE, "UNBILLED_UC_AMOUNT" NUMBER(11,4), "LAST_THRESHOLD" NUMBER(11,4), "LAST_ACTUAL_THRESHOLD" NUMBER(11,4), "CREDIT_LIMIT" NUMBER(11,4), "TOTAL_OBLIGATION" NUMBER(11,4), "HOLIDAY_IND" VARCHAR2(1), CONSTRAINT "PM9_CRDT_LMT_NOTIFICATION_PK" PRIMARY KEY ("CYCLE_CODE", "CYCLE_MONTH", "CYCLE_YEAR", "CUSTOMER_ID", "AGREEMENT_ID", "OFFER_INSTANCE", "ITEM_ID") ENABLE ) ;

可以看到得到的语句是期望之中的，如果有其他的索引信息，也都能得到相应的语句。