轉載自：https://www.cnblogs.com/chinesern/p/9127970.html

1. fnc_table_to_mysql 主體程序

create or replace function fnc_table_to_mysql ( i_owner in string, i_table_name in string, i_number_default_type in string := 'decimal', i_auto_incretment_column_name in string := '%ID' ) /* 功能：ORACLE表生成MYSQL建表DDL 作者：葉正盛 2013-07-27 新浪微博:@yzsind-葉正盛 參數說明： i_owner:schema名 i_table_name:表名 i_number_default_type:NUMBER默認轉換的類型，缺省是decimal i_auto_incretment_column_name:自增屬性字段名稱規則，默認是%ID 已知問題： 1.不支持分區 2.不支持函數索引，位圖索引等特殊索引定義 3.不支持自定義數據類型，不支持ROWID,RAW等特殊數據類型 4.不支持外鍵 5.不支持自定義約束 6.不支持與空間、事務相關屬性 7.DATE與TIMESTAMP轉換成datetime，需注意精度 8.超大NUMBER直接轉換為bigint，需注意精度 9.auto incretment 是根據字段名規則加一些判斷，設置不一定準確，需檢查 */ return clob is Result clob; cnt number; data_type varchar2(128); column_str varchar2(4000); pk_str varchar2(4000); table_comments varchar2(4000); is_pk_column number := 0; begin select count(*) into cnt from all_tables where owner = i_owner and table_name = i_table_name; if (cnt = 0) then RAISE_APPLICATION_ERROR(-20000,'can''t found table,please check input!'); else Result := 'CREATE TABLE `' || lower(i_table_name) || '`('; --column for c in (select a.column_name, a.data_type, a.data_length, a.data_precision, a.data_scale, a.nullable, a.data_default, b.COMMENTS from all_tab_cols a, all_col_comments b where a.owner = i_owner and a.table_name = i_table_name and a.HIDDEN_COLUMN = 'NO' and a.owner = b.OWNER and a.TABLE_NAME = b.TABLE_NAME and a.COLUMN_NAME = b.COLUMN_NAME order by a.column_id) loop if (c.data_type = 'VARCHAR2' or c.data_type = 'NVARCHAR2') then data_type := 'varchar(' || c.data_length || ')'; elsif (c.data_type = 'CHAR' or c.data_type = 'NCHAR') then data_type := 'char(' || c.data_length || ')'; elsif (c.data_type = 'NUMBER') then if (c.column_name like '%ID' and c.data_scale is null) then data_type := 'bigint'; elsif (c.data_precision<3 and c.data_scale = 0) then data_type := 'tinyint'; elsif (c.data_precision<5 and c.data_scale = 0) then data_type := 'smallint'; elsif (c.data_precision<10 and c.data_scale = 0) then data_type := 'int'; elsif (c.data_precision is not null and c.data_scale = 0) then data_type := 'bigint'; elsif (c.data_precision is not null and c.data_scale is not null) then data_type := 'decimal(' || c.data_precision || ',' || c.data_scale || ')'; else data_type := i_number_default_type; end if; elsif (c.data_type = 'DATE' or c.data_type like 'TIMESTAMP%') then data_type := 'datetime'; elsif (c.data_type = 'CLOB' or c.data_type = 'NCLOB' or c.data_type = 'LONG') then data_type := 'text'; elsif (c.data_type = 'BLOB' or c.data_type = 'LONG RAW') then data_type := 'blob'; elsif (c.data_type = 'BINARY_FLOAT') then data_type := 'float'; elsif (c.data_type = 'BINARY_DOUBLE') then data_type := 'double'; else data_type := c.data_type; end if; column_str := ' `' || lower(c.column_name) || '` ' || data_type; if (c.column_name like i_auto_incretment_column_name and (c.data_scale is null or c.data_scale = 0)) then select count(*) into is_pk_column from all_constraints a, all_cons_columns b where a.owner = i_owner and a.table_name = i_table_name and a.constraint_type = 'P' and a.OWNER = b.OWNER and a.TABLE_NAME = b.TABLE_NAME and a.CONSTRAINT_NAME = b.CONSTRAINT_NAME and b.COLUMN_NAME = c.column_name; if is_pk_column > 0 then column_str := column_str || ' AUTO_INCREMENT'; end if; end if; if c.nullable = 'NO' then column_str := column_str || ' NOT NULL'; end if; if (trim(c.data_default) is not null) then column_str := column_str || ' DEFAULT ' || trim(replace(replace(c.data_default, chr(13), ''), chr(10), '')); end if; if c.comments is not null then column_str := column_str || ' COMMENT ''' || c.comments || ''''; end if; Result := Result || chr(10) || column_str || ','; end loop; --pk for c in (select a.constraint_name, wm_concat(a.column_name) pk_columns from (select a.CONSTRAINT_NAME, '`' || b.COLUMN_NAME || '`' column_name from all_constraints a, all_cons_columns b where a.owner = i_owner and a.table_name = i_table_name and a.constraint_type = 'P' and a.OWNER = b.OWNER and a.TABLE_NAME = b.TABLE_NAME and a.CONSTRAINT_NAME = b.CONSTRAINT_NAME order by b.POSITION) a group by a.constraint_name) loop Result := Result || chr(10) || ' PRIMARY KEY (' || lower(c.pk_columns) || '),'; end loop; --unique for c in (select a.constraint_name, wm_concat(a.column_name) uk_columns from (select a.CONSTRAINT_NAME, '`' || b.COLUMN_NAME || '`' column_name from all_constraints a, all_cons_columns b where a.owner = i_owner and a.table_name = i_table_name and a.constraint_type = 'U' and a.OWNER = b.OWNER and a.TABLE_NAME = b.TABLE_NAME and a.CONSTRAINT_NAME = b.CONSTRAINT_NAME order by b.POSITION) a group by a.constraint_name) loop Result := Result || chr(10) || ' UNIQUE KEY `' || lower(c.constraint_name) || '`(' || lower(c.uk_columns) || '),'; end loop; -- index for c in (select a.index_name, wm_concat(a.column_name) ind_columns from (select a.index_name, '`' || a.COLUMN_NAME || '`' column_name from all_ind_columns a where a.table_owner = i_owner and a.TABLE_NAME = i_table_name and not exists (select index_name from all_constraints b where a.TABLE_OWNER = b.owner and a.TABLE_NAME = b.TABLE_NAME and a.INDEX_NAME = b.INDEX_NAME) order by a.COLUMN_POSITION) a group by a.index_name) loop Result := Result || chr(10) || ' KEY `' || lower(c.index_name) || '`(' || lower(c.ind_columns) || '),'; end loop; Result := substr(Result, 1, length(result) - 1) || chr(10) || ')'; --table comments select max(a.COMMENTS) into table_comments from all_tab_comments a where owner = i_owner and table_name = i_table_name; if (table_comments is not null) then Result := Result || 'COMMENT=''' || table_comments || ''''; end if; Result := Result || ';'; end if; return(Result); end fnc_table_to_mysql; /

2 需要轉換的oracle 表

CREATE TABLE "TEST_MYSQL"."UC_CUST_SY_CPZX" ( "BUSI_DATE" NUMBER(*,0), "TRADE_DATE" NUMBER(*,0), "YEAR_ID" NUMBER(*,0), "MONTH_ID" NUMBER(*,0), "DAY_ID" NUMBER(*,0), "CPLX" CHAR(2 BYTE), "CPDM" VARCHAR2(100 BYTE), "PRODUCT_NAME" VARCHAR2(300 BYTE), "DWJZ" NUMBER(19,4) NOT NULL ENABLE, "LJJZ" NUMBER(19,4) NOT NULL ENABLE, "RZZL" NUMBER(19,4) NOT NULL ENABLE, "FQJZ" NUMBER(19,4) NOT NULL ENABLE, "LJJZSYL" NUMBER(19,4) NOT NULL ENABLE, "CPGLMS" NUMBER(*,0));

3 轉換

SQL> select dbms_lob.substr(fnc_table_to_mysql('TEST_MYSQL','UC_CUST_SY_CPZX','decimal','ID')) FROM DUAL; CREATE TABLE `uc_cust_sy_cpzx`(`busi_date` decimal,`trade_date` decimal,`year_id` decimal,`month_id` decimal,`day_id` decimal,`cplx` char(2),`cpdm` varchar(100),`product_name` varchar(300),`dwjz` decimal(19,4),`ljjz` decimal(19,4),`rzzl` decimal(19,4),`fqjz` decimal(19,4),`ljjzsyl` decimal(19,4),`cpglms` decimal );

總結

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