tt c mysql t4 bll_T4模版引擎之生成数据库实体类

￡神魔★判官ぃ 2022-10-26 14:04 141阅读 0赞

public classDbHelper

\{\#region GetDbTables

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

\{if (!string.IsNullOrEmpty(tables))

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

\}\#region SQL

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);\#endregionDataTable dt=GetDataTable(connectionString, sql);return dt.Rows.Cast().Select(row => newDbTable

TableName= row.Field("tablename"),

SchemaName= row.Field("schemname"),

Rows= row.Field("rows"),

HasPrimaryKey= row.Field("HasPrimaryKey")

\}).ToList();

\}\#endregion

\#region GetDbColumns

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

\{\#region SQL

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

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);\#endregionSqlParameter 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().Select(row => newDbColumn()

ColumnID= row.Field("ColumnID"),

IsPrimaryKey= row.Field("IsPrimaryKey"),

ColumnName= row.Field("ColumnName"),

ColumnType= row.Field("ColumnType"),

IsIdentity= row.Field("IsIdentity"),

IsNullable= row.Field("IsNullable"),

ByteLength= row.Field("ByteLength"),

CharLength= row.Field("CharLength"),

Scale= row.Field("Scale"),

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

\}).ToList();

\}\#endregion

\#region GetDataTable

public static DataTable GetDataTable(string connectionString, string commandText, paramsSqlParameter\[\] parms)

\{using (SqlConnection connection = newSqlConnection(connectionString))

SqlCommand command=connection.CreateCommand();

command.CommandText=commandText;

command.Parameters.AddRange(parms);

SqlDataAdapter adapter= newSqlDataAdapter(command);

DataTable dt= newDataTable();

adapter.Fill(dt);returndt;

\}\#endregion\}\#region DbTable

///

///表结构///

public sealed classDbTable

\{///

///表名称///

public string TableName \{ get; set; \}///

///表的架构///

public string SchemaName \{ get; set; \}///

///表的记录数///

public int Rows \{ get; set; \}///

///是否含有主键///

public bool HasPrimaryKey \{ get; set; \}

\}\#endregion

\#region DbColumn

///

///表字段结构///

public sealed classDbColumn

\{///

///字段ID///

public int ColumnID \{ get; set; \}///

///是否主键///

public bool IsPrimaryKey \{ get; set; \}///

///字段名称///

public string ColumnName \{ get; set; \}///

///字段类型///

public string ColumnType \{ get; set; \}///

///数据库类型对应的C\#类型///

public stringCSharpType

\{get\{returnSqlServerDbTypeMap.MapCsharpType(ColumnType);

\}///

///

publicType CommonType

\{get\{returnSqlServerDbTypeMap.MapCommonType(ColumnType);

\}///

///字节长度///

public int ByteLength \{ get; set; \}///

///字符长度///

public int CharLength \{ get; set; \}///

///小数位///

public int Scale \{ get; set; \}///

///是否自增列///

public bool IsIdentity \{ get; set; \}///

///是否允许空///

public bool IsNullable \{ get; set; \}///

///描述///

public string Remark \{ get; set; \}

\}\#endregion

\#region SqlServerDbTypeMap

public classSqlServerDbTypeMap

\{public static string MapCsharpType(stringdbtype)

\{if (string.IsNullOrEmpty(dbtype)) returndbtype;

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;

\}returncsharpType;

\}public static Type MapCommonType(stringdbtype)

\{if (string.IsNullOrEmpty(dbtype)) returnType.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;

\}returncommonType;

\}\#endregion\#>