sqlserver数据库 Schema

//读取数据库中所有的数据库

USE MASTER
        DECLARE @is_policy_automation_enabled bit
        SET @is_policy_automation_enabled  = (SELECT CONVERT(bit, current_value) FROM msdb.dbo.syspolicy_configuration WHERE name = 'Enabled')
SELECT
dtb.name AS [Database_Name],
'Server[@Name=' + quotename(CAST(serverproperty(N'Servername') AS sysname),'''') + ']' + '/Database[@Name=' + quotename(dtb.name,'''') + ']' AS [Database_Urn],
case when 1=@is_policy_automation_enabled and exists (select * from msdb.dbo.syspolicy_system_health_state where target_query_expression_with_id like 'Server'+ '/Database\[@ID=' + convert(nvarchar(20),dtb.database_id) + '\]%' ESCAPE '\') then 1 else 0 end AS [Database_PolicyHealthState],
dtb.recovery_model AS [Database_RecoveryModel],
suser_sname(dtb.owner_sid) AS [Database_Owner],
              case
              when DATABASEPROPERTY(dtb.name,'IsShutDown') is null then 0x200
              else 0
              end |
              case
              when 1 = dtb.is_in_standby then 0x40
              else 0
              end |
              case
              when 1 = dtb.is_cleanly_shutdown then 0x80
              else 0
              end |
              case dtb.state
              when 1 then 0x2
              when 2 then 0x8
              when 3 then 0x4
              when 4 then 0x10
              when 5 then 0x100
              when 6 then 0x20
              else 1
              end
             AS [Database_Status],
dtb.compatibility_level AS [Database_CompatibilityLevel],
ISNULL(dmi.mirroring_role,0) AS [Database_MirroringRole],
ISNULL(dmi.mirroring_state + 1, 0) AS [Database_MirroringStatus],
dtb.recovery_model AS [RecoveryModel],
dtb.user_access AS [UserAccess],
dtb.is_read_only AS [ReadOnly],
dtb.name AS [Database_DatabaseName2]
FROM
master.sys.databases AS dtb
LEFT OUTER JOIN sys.database_mirroring AS dmi ON dmi.database_id = dtb.database_id

WHERE
(CAST(case when dtb.name in ('master','model','msdb','tempdb') then 1 else dtb.is_distributor end AS bit)=0)
ORDER BY
[Database_Name] ASC

//读取数据库中所有的表

 USE [Nop]
         DECLARE @is_policy_automation_enabled bit
         SET @is_policy_automation_enabled  = (SELECT CONVERT(bit, current_value)
                                               FROM msdb.dbo.syspolicy_configuration
                                               WHERE name = 'Enabled')
 SELECT
 tbl.name AS [Name],
 SCHEMA_NAME(tbl.schema_id) AS [Schema],
 'Server[@Name=' + quotename(CAST(
         serverproperty(N'Servername')
        AS sysname),'''') + ']' + '/Database[@Name=' + quotename(db_name(),'''') + ']' + '/Table[@Name=' + quotename(tbl.name,'''') + ' and @Schema=' + quotename(SCHEMA_NAME(tbl.schema_id),'''') + ']' AS [Urn],
 case when 1=@is_policy_automation_enabled and exists (select * from msdb.dbo.syspolicy_system_health_state where target_query_expression_with_id like 'Server' + '/Database\[@ID=' + convert(nvarchar(20),dtb.database_id) + '\]'+ '/Table\[@ID=' + convert(nvarchar(20),tbl.object_id) + '\]%' ESCAPE '\') then 1 else 0 end AS [PolicyHealthState],
 tbl.create_date AS [CreateDate],
 CAST(
  case
     when tbl.is_ms_shipped = 1 then 1
     when (
         select
             major_id
         from
             sys.extended_properties
         where
             major_id = tbl.object_id and
             minor_id = 0 and
             class = 1 and
             name = N'microsoft_database_tools_support')
         is not null then 1
     else 0
 end
              AS bit) AS [IsSystemObject]
 FROM
 master.sys.databases AS dtb,
 sys.tables AS tbl
 WHERE
 (CAST(
  case
     when tbl.is_ms_shipped = 1 then 1
     when (
         select
             major_id
         from
             sys.extended_properties
         where
             major_id = tbl.object_id and
             minor_id = 0 and
             class = 1 and
             name = N'microsoft_database_tools_support')
         is not null then 1
     else 0
 end
              AS bit)=0)and((db_name()='Nop')and(dtb.name=db_name()))
 ORDER BY
 [Schema] ASC,[Name] ASC

//读取数据库表中的字段信息

USE [Nop]
SELECT
clmns.is_identity AS IsIdentity,
clmns.name AS [Name],
'Server[@Name=' + quotename(CAST(
        serverproperty(N'Servername')
       AS sysname),'''') + ']' + '/Database[@Name=' + quotename(db_name(),'''') + ']' + '/Table[@Name=' + quotename(tbl.name,'''') + ' and @Schema=' + quotename(SCHEMA_NAME(tbl.schema_id),'''') + ']' + '/Column[@Name=' + quotename(clmns.name,'''') + ']' AS [Urn],
CAST(ISNULL(cik.index_column_id, 0) AS bit) AS [InPrimaryKey],
CAST(ISNULL((select TOP 1 1 from sys.foreign_key_columns AS colfk where colfk.parent_column_id = clmns.column_id and colfk.parent_object_id = clmns.object_id), 0) AS bit) AS [IsForeignKey],
usrt.name AS [DataType],
ISNULL(baset.name, N'') AS [SystemType],
CAST(CASE WHEN baset.name IN (N'nchar', N'nvarchar') AND clmns.max_length <> -1 THEN clmns.max_length/2 ELSE clmns.max_length END AS int) AS [Length],
CAST(clmns.precision AS int) AS [NumericPrecision],
CAST(clmns.scale AS int) AS [NumericScale],
clmns.is_nullable AS [Nullable],
clmns.is_computed AS [Computed],
ISNULL(s2clmns.name, N'') AS [XmlSchemaNamespaceSchema],
ISNULL(xscclmns.name, N'') AS [XmlSchemaNamespace],
ISNULL( (case clmns.is_xml_document when 1 then 2 else 1 end), 0) AS [XmlDocumentConstraint],
CAST(clmns.is_sparse AS bit) AS [IsSparse],
CAST(clmns.is_column_set AS bit) AS [IsColumnSet],
isnull(comments.text,'') as DefaultValue,
isnull(properties.[value],'') as FieldRemark
FROM
sys.tables AS tbl
INNER JOIN sys.all_columns AS clmns ON clmns.object_id=tbl.object_id
LEFT OUTER JOIN sys.indexes AS ik ON ik.object_id = clmns.object_id and 1=ik.is_primary_key
LEFT OUTER JOIN sys.index_columns AS cik ON cik.index_id = ik.index_id and cik.column_id = clmns.column_id and cik.object_id = clmns.object_id and 0 = cik.is_included_column
LEFT OUTER JOIN sys.types AS usrt ON usrt.user_type_id = clmns.user_type_id
LEFT OUTER JOIN sys.types AS baset ON (baset.user_type_id = clmns.system_type_id and baset.user_type_id = baset.system_type_id) or ((baset.system_type_id = clmns.system_type_id) and (baset.user_type_id = clmns.user_type_id) and (baset.is_user_defined = 0) and (baset.is_assembly_type = 1))
LEFT OUTER JOIN sys.xml_schema_collections AS xscclmns ON xscclmns.xml_collection_id = clmns.xml_collection_id
LEFT OUTER JOIN sys.schemas AS s2clmns ON s2clmns.schema_id = xscclmns.schema_id
LEFT OUTER JOIN syscomments AS comments on clmns.default_object_id=comments.id
LEFT OUTER JOIN sys.extended_properties AS properties on clmns.object_id=properties.major_id AND clmns.column_id = properties.minor_id 

WHERE
(tbl.name='AclRecord' and SCHEMA_NAME(tbl.schema_id)='dbo')
ORDER BY
clmns.column_id ASC

Oracle数据库Scheme

1，连接数据库字符串

string connStr = "Data Source='" + Utility.Database + "';uid='" + Utility.Username + "';pwd='" + Utility.Password + "';"; 

2，通过注册表获取oracle实例名方法；

 public static string[] GetOracleTnsNames()
        {
            // 查询注册表，获取oracle服务文件路径
            RegistryKey key = Registry.LocalMachine.OpenSubKey("SOFTWARE").OpenSubKey("ORACLE\\HOME0");
            if (key == null)
            {
                key = Registry.LocalMachine.OpenSubKey("SOFTWARE").OpenSubKey("ORACLE\\KEY_OraClient11g_home1");
            }
            if (key == null)
            {
                key = Registry.LocalMachine.OpenSubKey("SOFTWARE").OpenSubKey("ORACLE\\KEY_OraDb11g_home1");
            }
            if (key == null)
                return null;
            string home = (string)key.GetValue("ORACLE_HOME");
            string file = home + @"\network\ADMIN\tnsnames.ora"; 

            // 解析文件
            string line; 

            ArrayList arr = new ArrayList();
            StreamReader sr = new StreamReader(file);
            while ((line = sr.ReadLine()) != null)
            {
                line = line.Trim();
                if (line != "")
                {
                    char c = line[];
                    if (c >= 'A' && c <= 'z')
                    {
                        if(line.IndexOf('=')>)
                            arr.Add(line.Substring(, line.IndexOf('=')).Trim());
                    }
                }
            }
            sr.Close();
            // 返回字符串数组
            return (string[])arr.ToArray(typeof(string));
        }

3，读取所有表

select table_name from user_tables order by table_name;

4，读取表字段和类型信息

select 0 Status,
       a.Column_Name,
       a.nullable as Nullable,
       a.data_default as Defaults,
       a.data_type || '(' || a.data_length || ')' as Column_Type,
       b.comments as Comments,
       decode(c.column_name, null, null, 'PRI') as keyflag
  from user_tab_columns a,
       user_col_comments b,
       (select c.table_name, d.column_name
          from user_constraints c, user_cons_columns d
         where c.constraint_name = d.constraint_name
           and c.constraint_type = 'P') c
 where a.table_name = b.table_name(+)
   and a.column_name = b.column_name(+)
   and a.table_name = c.table_name(+)
   and a.column_name = c.column_name(+)
   and a.table_name = 'WWW'  //www是具体的表名
 order by a.column_id

有了这些就能根据表结构来生成一些代码了。