获取通过sql查询数据库的表，字段，主键，自增，字段类型等信息。

1.查询所有表，以及表的备注信息。

Oracle数据库

 

select t.table_name tableName, cmts.comments descr 
from user_tables t
left join user_tab_comments cmts on t.table_name = cmts.table_name
where t.table_name like '%'

SQL Server

 

 

Select d.Name tableName, isnull(e.value,'') descr 
From SysObjects d
left join  sys.extended_properties  e on d.id = e.major_id   and   e.minor_id=0 
Where d.XType='U' and d.name like ? order By d.Name

 

 

MySQL

 

SELECT table_name tableName, TABLE_COMMENT descr  
FROM information_schema.tables 
WHERE table_schema = ? and table_name like ? ORDER BY table_name DESC

2.查询指定表的 字段名称，是否主键，是否自增，数据类型，字段注释信息。

 

Oracle

 

select c.column_name columnName, case when cu.column_name is null then 'false' else 'true' end as pkColumn,'false' as  autoAdd
	, c.data_type jdbcType	, cmts.comments descr
from user_tab_columns  c
left join user_constraints au on c.table_name = au.table_name and au.constraint_type = 'P'
left join user_cons_columns cu on cu.constraint_name = au.constraint_name and c.column_name = cu.column_name
left join user_col_comments cmts on cmts.table_name = c.table_name and cmts.column_name = c.column_name 
where c.table_name = UPPER(?)
order by c.column_id  

SQL Server

 

 

SELECT t1.name columnName,case when  t4.id is null then 'false' else 'true' end as pkColumn, 
	case when  COLUMNPROPERTY( t1.id,t1.name,'IsIdentity') = 1 then 'true' else 'false' end as  autoAdd
	,t5.name jdbcType 
	,cast(isnull(t6.value,'') as varchar(2000)) descr
    ,tb.name as tableName 
FROM SYSCOLUMNS t1
left join SYSOBJECTS t2 on  t2.parent_obj = t1.id  AND t2.xtype = 'PK' 
left join SYSINDEXES t3 on  t3.id = t1.id  and t2.name = t3.name  
left join SYSINDEXKEYS t4 on t1.colid = t4.colid and t4.id = t1.id and t4.indid = t3.indid
left join systypes  t5 on  t1.xtype=t5.xtype
left join sys.extended_properties t6   on  t1.id=t6.major_id   and   t1.colid=t6.minor_id
left join SYSOBJECTS tb  on  tb.id=t1.id
where tb.name=?

MySQL

 

 

SELECT a.column_Name AS columnName  ,CASE WHEN p.column_Name IS NULL THEN 'false' ELSE 'true' END  AS pkColumn
	,CASE WHEN a.extra = 'auto_increment' THEN 'true' ELSE 'false' END  AS autoAdd,a.data_type jdbcType, column_COMMENT descr  
FROM information_schema.COLUMNS  a
LEFT JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS p ON a.table_schema = p.table_schema AND a.table_name = p.TABLE_NAME AND a.COLUMN_NAME = p.COLUMN_NAME AND p.constraint_name='PRIMARY'
WHERE a.table_schema = ? AND a.table_name = ? 
ORDER BY a.ordinal_position