ORACLE表生成MYSQL建表DDL
create or replace function fnc_table_to_mysql(i_owner in string,
i_table_name in string
)
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;
i_number_default_type varchar2(20) := 'decimal';
--i_auto_incretment_column_name varchar2(10) := '%ID';
v_table_name varchar2(40);
begin
v_table_name := upper(i_table_name);
-- 1. 判断表是否存在
select count(*)
into cnt
from all_tables
where owner = upper(i_owner)
and table_name = v_table_name;
if (cnt = 0) then
RAISE_APPLICATION_ERROR(-20000, 'can''t found table,please check input!');
else
--2. 循环转换每一列
Result := 'CREATE TABLE `' || lower(v_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 = v_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
--2.1 获取数据类型
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') then
data_type := 'date';
elsif (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;
--2.2 构造列名与数据类型
column_str := ' `' || lower(c.column_name) || '` ' || data_type;
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;
--2.3 构造列名注释
if c.comments is not null then
column_str := column_str || ' COMMENT ''' || c.comments || '''';
end if;
Result := Result || chr(10) || column_str || ',';
end loop;
--3. 构造主键
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 = v_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;
--4. 唯一索引
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 = v_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;
--5. 索引
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 = v_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) || ')';
--6. table comments
select max(a.COMMENTS)
into table_comments
from all_tab_comments a
where owner = i_owner
and table_name = v_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;
来源： http://blog.csdn.net/yzsind/article/details/9531065