建立文本模板TextTemplate1.tt和DbHelper.ttinclude
TextTemplate1.tt 代码:
<#@ assembly name="System.Core.dll" #><#@ assembly name="System.Data.dll" #><#@ assembly name="System.Data.DataSetExtensions.dll" #><#@ assembly name="System.Xml.dll" #><#@ import namespace="System" #><#@ import namespace="System.Xml" #><#@ import namespace="System.Linq" #><#@ import namespace="System.Data" #><#@ import namespace="System.Data.SqlClient" #><#@ import namespace="System.Collections.Generic" #><#@ import namespace="System.IO" #><#@ include file="$(ProjectDir)DbHelper.ttinclude" #>using System;namespace T4ConsoleApplication.Entities{ public class <#=config.TableName#> { <# foreach(DbColumn column in DbHelper.GetDbColumns(config.ConnectionString, config.DbDatabase, config.TableName)){#> public <#= column.CSharpType#><# if(column.CommonType.IsValueType && column.IsNullable){#>?<#}#> <#=column.ColumnName#> { get; set; } <#}#> }}<#+ public class config { //修改要生成的数据库表 public static readonly string ConnectionString="Data Source=.;User ID=MyUserID; password=MyPwd;"; public static readonly string DbDatabase="MyDataBase"; public static readonly string TableName="MyTable"; }#> DbHelper.ttinclude 代码:
<#+ public class DbHelper { #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); #endregion DataTable dt = GetDataTable(connectionString, sql); return dt.Rows.Cast ().Select(row => new DbTable { 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); #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 ().Select(row => new DbColumn() { 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, 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 DbTable /// /// 表结构 /// public sealed class DbTable { /// /// 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 class DbColumn { /// /// 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 string CSharpType { get { return SqlServerDbTypeMap.MapCsharpType(ColumnType); } } /// /// /// public Type CommonType { get { return SqlServerDbTypeMap.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 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; } } #endregion #> 直接保存即可生成指定数据库表实体 生成的实体: 