oracle到hive数据类型转换

oracle和hive中的数据类型存在差异，在oracle集成数据到hive中这样的场景下，我们希望在hive中的数据是贴源的，所以在hive中希望创建和oracle结构一致的表。

oracle到hive数据类型映射参考如下：

select case when t1.column_id=1 then 'CREATE TABLE IF NOT EXISTS '||'project'||'.'||t1.owner||'_'||t1.table_name||chr(10) end
||RPad(case when t1.column_id=1 then '(' else ',' end||t1.column_name,33,' ')
||RPad(case when t1.data_type in ('CHAR','VARCHAR2')     then 'VARCHAR('||t1.data_length||')' when t1.data_type in ('TIMESTAMP(6)','DATE') then 'TIMESTAMP' when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision =1 then 'TINYINT'when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision <4 then 'SMALLINT'when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision <9 then 'INT'when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision <19 then 'BIGINT'when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision >=19 then 'STRING'when t1.data_type ='NUMBER' and t1.data_scale>0 and t1.data_scale <=38 and t1.data_precision <=38 then 'DECIMAL('||t1.data_precision||','||t1.data_scale||')'when t1.data_type ='FLOAT'  then 'DOUBLE'else 'STRING' end,50,' ')||' COMMENT '''||case when t4.column_name is not null then 'primary_key:' else '' end||replace(t2.comments,'''','')||''''||case when max(t1.column_id) over() = t1.column_id then chr(10)||',ETL_SJ STRING COMMENT ''ETL时间'')COMMENT '''||t3.comments||'''
PARTITIONED BY (RFQ STRING COMMENT ''同步日期'');' end as colfrom sys.dba_tab_cols t1inner join sys.dba_col_comments t2 on t1.owner =t2.ownerand t1.table_name = t2.table_nameand t1.column_name = t2.column_nameinner join sys.dba_tab_comments t3on t1.owner =t3.ownerand t1.table_name = t3.table_nameleft join(
select t2.table_owner,t2.table_name,t2.column_namefrom (
select table_name,table_owner,index_name
,row_number() over(order by case when instr(index_name,'PK')>0 then instr(index_name,'PK') else 100 end asc) as ccfrom sys.dba_indexeswhere uniqueness  =upper('UNIQUE')and index_type ='NORMAL'and table_owner||'_'||table_name=upper('owner_table'))t1inner join sys.dba_ind_columns t2on t1.index_name =t2.index_nameand t1.table_name =t2.table_nameand t1.table_owner=t2.table_ownerwhere t1.cc=1)t4on t1.owner      =t4.table_ownerand t1.table_name =t4.table_nameand t1.column_name=t4.column_namewhere t1.data_type not in ('LONG','NCLOB', 'CLOB','BLOB','BFILE','CFILE')and t1.owner||'_'||t1.table_name =upper('owner_table')
order by t1.column_id;

beginDBMS_OUTPUT.enable(BUFFER_SIZE => NULL);for i in (select owner||'_'||table_name tab from dba_tables where owner in （
'HX_ZS'
）) LOOPFOR J IN (select case when t1.column_id=1 then 'CREATE TABLE IF NOT EXISTS '||'project'||'.'||t1.owner||'_'||t1.table_name||chr(10) end
||RPad(case when t1.column_id=1 then '(' else ',' end||case when t1.column_name='SJLYBZ' then 'SJLYBZ_1' else t1.column_name end,33,' ')
||RPad(case when t1.data_type in ('VARCHAR2')     then 'VARCHAR('||t1.data_length||')' when t1.data_type in ('CHAR')     then 'CHAR('||t1.data_length||')'  when t1.data_type in ('TIMESTAMP(6)','DATE') then 'TIMESTAMP' when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision =1 then 'TINYINT'when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision <4 then 'SMALLINT'when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision <9 then 'INT'when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision <19 then 'BIGINT'when t1.data_type ='NUMBER' and t1.data_scale=0 and t1.data_precision >=19 then 'DECIMAL('||t1.data_precision||','||t1.data_scale||')'when t1.data_type ='NUMBER' and t1.data_scale>0 and t1.data_scale <=38 and t1.data_precision <=38 then 'DECIMAL('||t1.data_precision||','||t1.data_scale||')'when t1.data_type ='FLOAT'  then 'DOUBLE'else 'STRING' end,50,' ')||' COMMENT '''||case when t4.column_name is not null then 'primary_key:' else '' end||replace(t2.comments,'''','')||''''||case when max(t1.column_id) over() = t1.column_id then chr(10)||',YPTETL_SJ TIMESTAMP COMMENT  '||CHR(39)|| '云平台ETL时间'||CHR(39)||')COMMENT '''||t3.comments||'''
PARTITIONED BY (rfq CHAR(8) COMMENT '||CHR(39)|| '日分区'||CHR(39)||',sjlybz VARCHAR(20)  COMMENT '||CHR(39)|| '数据来源标志'||CHR(39)||');' end as colfrom sys.dba_tab_cols t1inner join sys.dba_col_comments t2 on t1.owner =t2.ownerand t1.table_name = t2.table_nameand t1.column_name = t2.column_nameinner join sys.dba_tab_comments t3on t1.owner =t3.ownerand t1.table_name = t3.table_nameleft join(
select t2.table_owner,t2.table_name,t2.column_namefrom (select t6.owner table_owner, t6.table_name, t6.column_namefrom dba_constraints t5, dba_cons_columns t6where t5.table_name = t6.table_nameand t5.owner = t6.ownerand t5.constraint_name = t6.constraint_nameand CONSTRAINT_TYPE IN ('P')and t5.OWNER ||'_'||t5.table_name =i.tab)t4on t1.owner      =t4.table_ownerand t1.table_name =t4.table_nameand t1.column_name=t4.column_namewhere t1.data_type not in ('LONG','NCLOB', 'CLOB','BLOB','BFILE','CFILE')and t1.owner||'_'||t1.table_name =i.tab
order by t1.column_id) loop
dbms_output.put_line(j.col);
end loop ;
end loop;
end;
/

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