<#+

class DbHelper

{

#region 获取数据库表结构

public static List<DbTable> GetDbTables(string connectionString, string database, string tables = null)

{

if (!string.IsNullOrEmpty(tables))

{

tables = string.Format(" and obj.name in ('{0}')", tables.Replace(",", "','"));

}

#region 执行sql命令

string sql = string.Format(@"SELECT

obj.name tablename,

schem.name schemname,

idx.rows,

CAST

(

CASE

WHEN (SELECT COUNT(1) FROM sys.indexes WHERE object_id= obj.OBJECT_ID AND is_primary_key=1) >=1 THEN 1

ELSE 0

END

AS BIT) HasPrimaryKey

from {0}.sys.objects obj

inner join {0}.dbo.sysindexes idx on obj.object_id=idx.id and idx.indid<=1

INNER JOIN {0}.sys.schemas schem ON obj.schema_id=schem.schema_id

where type='U' {1}

order by obj.name", database, tables);

#endregion

DataTable dt = GetDataTable(connectionString, sql);

return dt.Rows.Cast<DataRow>().Select(row => new DbTable

{

TableName = row.Field<string>("tablename"),

SchemaName = row.Field<string>("schemname"),

Rows = row.Field<int>("rows"),

HasPrimaryKey = row.Field<bool>("HasPrimaryKey")

}).ToList();

}

#endregion

#region 获取表字段信息

public static List<DbColumn> GetDbColumns(string connectionString, string database, string tableName, string schema = "dbo")

{

#region 执行sql命令

string sql = string.Format(@"

WITH indexCTE AS

(

SELECT

ic.column_id,

ic.index_column_id,

ic.object_id

FROM {0}.sys.indexes idx

INNER JOIN {0}.sys.index_columns ic ON idx.index_id = ic.index_id AND idx.object_id = ic.object_id

WHERE idx.object_id =OBJECT_ID(@tableName) AND idx.is_primary_key=1

)

select

colm.column_id ColumnID,

CAST(CASE WHEN indexCTE.column_id IS NULL THEN 0 ELSE 1 END AS BIT) IsPrimaryKey,

colm.name ColumnName,

systype.name ColumnType,

colm.is_identity IsIdentity,

colm.is_nullable IsNullable,

cast(colm.max_length as int) ByteLength,

(

case

when systype.name='nvarchar' and colm.max_length>0 then colm.max_length/2

when systype.name='nchar' and colm.max_length>0 then colm.max_length/2

when systype.name='ntext' and colm.max_length>0 then colm.max_length/2

else colm.max_length

end

) CharLength,

cast(colm.precision as int) Precision,

cast(colm.scale as int) Scale,

prop.value Remark

from {0}.sys.columns colm

inner join {0}.sys.types systype on colm.system_type_id=systype.system_type_id and colm.user_type_id=systype.user_type_id

left join {0}.sys.extended_properties prop on colm.object_id=prop.major_id and colm.column_id=prop.minor_id and prop.class_desc='OBJECT_OR_COLUMN'

LEFT JOIN indexCTE ON colm.column_id=indexCTE.column_id AND colm.object_id=indexCTE.object_id

where colm.object_id=OBJECT_ID(@tableName)

order by colm.column_id", database);

#endregion

SqlParameter param = new SqlParameter("@tableName", SqlDbType.NVarChar, 100) { Value = string.Format("{0}.{1}.{2}", database, schema, tableName) };

DataTable dt = GetDataTable(connectionString, sql, param);

return dt.Rows.Cast<DataRow>().Select(row => new DbColumn()

{

ColumnID = row.Field<int>("ColumnID"),

IsPrimaryKey = row.Field<bool>("IsPrimaryKey"),

ColumnName = row.Field<string>("ColumnName"),

ColumnType = row.Field<string>("ColumnType"),

IsIdentity = row.Field<bool>("IsIdentity"),

IsNullable = row.Field<bool>("IsNullable"),

ByteLength = row.Field<int>("ByteLength"),

CharLength = row.Field<int>("CharLength"),

Scale = row.Field<int>("Scale"),

Remark = row["Remark"].ToString()

}).ToList();

}

#endregion

#region 获取 DataTable

public static DataTable GetDataTable(string connectionString, string commandText, params SqlParameter[] parms)

{

using (SqlConnection connection = new SqlConnection(connectionString))

{

SqlCommand command = connection.CreateCommand();

command.CommandText = commandText;

command.Parameters.AddRange(parms);

SqlDataAdapter adapter = new SqlDataAdapter(command);

DataTable dt = new DataTable();

adapter.Fill(dt);

return dt;

}

}

#endregion

#region 获取主键

public static string GetPrimaryKey(List<DbColumn> dbColumns)

{

string primaryKey = string.Empty;

if (dbColumns!=null&&dbColumns.Count>0)

{

foreach (var item in dbColumns)

{

if (item.IsPrimaryKey==true)

{

primaryKey = item.ColumnName;

}

}

}

return primaryKey;

}

#endregion

}

class DbTable

{

/// <summary>

/// 表名称

/// </summary>

public string TableName { get; set; }

/// <summary>

/// 表的架构

/// </summary>

public string SchemaName { get; set; }

/// <summary>

/// 表的记录数

/// </summary>

public int Rows { get; set; }

/// <summary>

/// 是否含有主键

/// </summary>

public bool HasPrimaryKey { get; set; }

}

class DbColumn

{

/// <summary>

/// 字段ID

/// </summary>

public int ColumnID { get; set; }

/// <summary>

/// 是否主键

/// </summary>

public bool IsPrimaryKey { get; set; }

/// <summary>

/// 字段名称

/// </summary>

public string ColumnName { get; set; }

/// <summary>

/// 字段类型

/// </summary>

public string ColumnType { get; set; }

/// <summary>

/// 数据库类型对应的C#类型

/// </summary>

public string CSharpType

{

get

{

return SqlServerDbTypeMap.MapCsharpType(ColumnType);

}

}

/// <summary>

///

/// </summary>

public Type CommonType

{

get

{

return SqlServerDbTypeMap.MapCommonType(ColumnType);

}

}

/// <summary>

/// 字节长度

/// </summary>

public int ByteLength { get; set; }

/// <summary>

/// 字符长度

/// </summary>

public int CharLength { get; set; }

/// <summary>

/// 小数位

/// </summary>

public int Scale { get; set; }

/// <summary>

/// 是否自增列

/// </summary>

public bool IsIdentity { get; set; }

/// <summary>

/// 是否允许空

/// </summary>

public bool IsNullable { get; set; }

/// <summary>

/// 描述

/// </summary>

public string Remark { get; set; }

}

class SqlServerDbTypeMap

{

public static string MapCsharpType(string dbtype)

{

if (string.IsNullOrEmpty(dbtype)) return dbtype;

dbtype = dbtype.ToLower();

string csharpType = "object";

switch (dbtype)

{

case "bigint": csharpType = "long"; break;

case "binary": csharpType = "byte[]"; break;

case "bit": csharpType = "bool"; break;

case "char": csharpType = "string"; break;

case "date": csharpType = "DateTime"; break;

case "datetime": csharpType = "DateTime"; break;

case "datetime2": csharpType = "DateTime"; break;

case "datetimeoffset": csharpType = "DateTimeOffset"; break;

case "decimal": csharpType = "decimal"; break;

case "float": csharpType = "double"; break;

case "image": csharpType = "byte[]"; break;

case "int": csharpType = "int"; break;

case "money": csharpType = "decimal"; break;

case "nchar": csharpType = "string"; break;

case "ntext": csharpType = "string"; break;

case "numeric": csharpType = "decimal"; break;

case "nvarchar": csharpType = "string"; break;

case "real": csharpType = "Single"; break;

case "smalldatetime": csharpType = "DateTime"; break;

case "smallint": csharpType = "short"; break;

case "smallmoney": csharpType = "decimal"; break;

case "sql_variant": csharpType = "object"; break;

case "sysname": csharpType = "object"; break;

case "text": csharpType = "string"; break;

case "time": csharpType = "TimeSpan"; break;

case "timestamp": csharpType = "byte[]"; break;

case "tinyint": csharpType = "byte"; break;

case "uniqueidentifier": csharpType = "Guid"; break;

case "varbinary": csharpType = "byte[]"; break;

case "varchar": csharpType = "string"; break;

case "xml": csharpType = "string"; break;

default: csharpType = "object"; break;

}

return csharpType;

}

public static Type MapCommonType(string dbtype)

{

if (string.IsNullOrEmpty(dbtype)) return Type.Missing.GetType();

dbtype = dbtype.ToLower();

Type commonType = typeof(object);

switch (dbtype)

{

case "bigint": commonType = typeof(long); break;

case "binary": commonType = typeof(byte[]); break;

case "bit": commonType = typeof(bool); break;

case "char": commonType = typeof(string); break;

case "date": commonType = typeof(DateTime); break;

case "datetime": commonType = typeof(DateTime); break;

case "datetime2": commonType = typeof(DateTime); break;

case "datetimeoffset": commonType = typeof(DateTimeOffset); break;

case "decimal": commonType = typeof(decimal); break;

case "float": commonType = typeof(double); break;

case "image": commonType = typeof(byte[]); break;

case "int": commonType = typeof(int); break;

case "money": commonType = typeof(decimal); break;

case "nchar": commonType = typeof(string); break;

case "ntext": commonType = typeof(string); break;

case "numeric": commonType = typeof(decimal); break;

case "nvarchar": commonType = typeof(string); break;

case "real": commonType = typeof(Single); break;

case "smalldatetime": commonType = typeof(DateTime); break;

case "smallint": commonType = typeof(short); break;

case "smallmoney": commonType = typeof(decimal); break;

case "sql_variant": commonType = typeof(object); break;

case "sysname": commonType = typeof(object); break;

case "text": commonType = typeof(string); break;

case "time": commonType = typeof(TimeSpan); break;

case "timestamp": commonType = typeof(byte[]); break;

case "tinyint": commonType = typeof(byte); break;

case "uniqueidentifier": commonType = typeof(Guid); break;

case "varbinary": commonType = typeof(byte[]); break;

case "varchar": commonType = typeof(string); break;

case "xml": commonType = typeof(string); break;

default: commonType = typeof(object); break;

}

return commonType;

}

}

class config

{

//public static readonly string ConnectionString = "Data Source=.;Initial Catalog=WMBlogDB;User ID=sa;Password=666;";

public static readonly string ConnectionString = File.Exists(@"D:\my-file\dbCountPsw2.txt") ? File.ReadAllText(@"D:\my-file\dbCountPsw2.txt").Trim(): "server=.;uid=sa;pwd=sa;database=WMBlogDB";

public static readonly string DbDatabase = "";

public static readonly string TableName = "";

}#>