我的 Server Explore 数据库文件中有多个表。我想为表生成类的自动代码，因此所有类及其属性、构造函数和 getter setter 方法都会自动生成。
请告诉我这样做的步骤。
【问题讨论】：
标签： c# class visual-studio-2010 auto-generate
我认为从表中生成 cs 类的最简单方法是查询您的数据库，例如在 SQL Server 中，您可以使用以下查询：
declare @tblName sysname = 'SetYourTableName'
declare @ResultText varchar(max) = 'public class ' + @tblName + '
{'
select @ResultText = @ResultText + '
public ' + ColumnType + NullableSign + ' ' + ColumnName + ' { get; set; }
'
from
(
select
replace(col.name, ' ', '_') ColumnName,
column_id ColumnId,
case typ.name
when 'bigint' then 'long'
when 'binary' then 'byte[]'
when 'bit' then 'bool'
when 'char' then 'string'
when 'date' then 'DateTime'
when 'datetime' then 'DateTime'
when 'datetime2' then 'DateTime'
when 'datetimeoffset' then 'DateTimeOffset'
when 'decimal' then 'decimal'
when 'float' then 'float'
when 'image' then 'byte[]'
when 'int' then 'int'
when 'money' then 'decimal'
when 'nchar' then 'string'
when 'ntext' then 'string'
when 'numeric' then 'decimal'
when 'nvarchar' then 'string'
when 'real' then 'double'
when 'smalldatetime' then 'DateTime'
when 'smallint' then 'short'
when 'smallmoney' then 'decimal'
when 'text' then 'string'
when 'time' then 'TimeSpan'
when 'timestamp' then 'DateTime'
when 'tinyint' then 'byte'
when 'uniqueidentifier' then 'Guid'
when 'varbinary' then 'byte[]'
when 'varchar' then 'string'
else 'UNKNOWN_' + typ.name
end ColumnType,
case
when col.is_nullable = 1 and typ.name in ('bigint', 'bit', 'date', 'datetime', 'datetime2', 'datetimeoffset', 'decimal', 'float', 'int', 'money', 'numeric', 'real', 'smalldatetime', 'smallint', 'smallmoney', 'time', 'tinyint', 'uniqueidentifier')
then '?'
else ''
end NullableSign
from sys.columns col
join sys.types typ on
col.system_type_id = typ.system_type_id AND col.user_type_id = typ.user_type_id
where object_id = object_id(@tblName)
) t
order by ColumnId
set @ResultText = @ResultText + '
}'
print @ResultText
然后运行此查询并将打印的结果文本复制到 Visual Studio 的新类中
希望对你有用
祝你好运
【讨论】：
我已经修改了上面的类并包含了所有缺少的方法
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;
namespace CodeGenerator
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnGenerateCode_Click(object sender, EventArgs e)
{
string conStrJobsDB = ConfigurationSettings.AppSettings["jobsDBConStrKey"].ToString();
CreateEntitiesFromDBTables(GetDataReader(conStrJobsDB));
}
private void CreateEntitiesFromDBTables(SqlDataReader dr)
{
if (dr != null)
{
string lstrOldTableName = string.Empty;
StreamWriter swClassWriter = null;
System.Text.StringBuilder sbFileName = null;
System.Text.StringBuilder sbConstructorCode = null;
System.Text.StringBuilder sbClassCode = null;
FileInfo tableClassFile = null;
while (dr.Read())
{
string lstrTableName = dr.GetString(0);
string lstrAttributeName = dr.GetString(1);
string lstrAttributeType = GetDotNetType(dr.GetString(2));
//If table name is changed...
if (lstrOldTableName != lstrTableName)
{
//and stream writer is already opened so close this class generation...
if (swClassWriter != null)
{
CreateClassBottom(swClassWriter);
swClassWriter.Close();
}
sbFileName = new System.Text.StringBuilder(lstrTableName);
sbFileName.Append("Entity.cs");
tableClassFile = new FileInfo(tbPath.Text + "\\" + sbFileName.ToString());
swClassWriter = tableClassFile.CreateText();
CreateClassTop(swClassWriter, lstrTableName);
//sbConstructorCode = new System.Text.StringBuilder("\r\n\t/// \r\n\t" +
// "/// User defined Contructor\r\n\t/// \r\n\tpublic ");
//sbConstructorCode = new System.Text.StringBuilder();
//sbConstructorCode.Append(lstrTableName);
//sbConstructorCode.Append("(");
}
else
{
this.CreateClassBody(swClassWriter, lstrAttributeType, lstrAttributeName);
//sbConstructorCode.AppendFormat("{0} {1}, \r\n\t\t",
// new object[] { lstrAttributeType, lstrAttributeName });
//sbConstructorCode.AppendFormat("\r\n\t\tthis._{0} = {0};",
// new object[] { lstrAttributeName });
}
lstrOldTableName = lstrTableName;
this.pBarMain.Increment(1);
}
MessageBox.Show("All classes generated.", "Done");
}
}
private SqlDataReader GetDataReader(string conStrJobsDB)
{
SqlConnection connection = null;
try
{
connection = new SqlConnection(conStrJobsDB);
if (connection == null)
return null;
connection.Open();
SqlCommand command = new System.Data.SqlClient.SqlCommand("exec spGenerateEntitiesFromTables", connection);
SqlDataReader dr = command.ExecuteReader();
if (dr.HasRows)
return dr;
else
return null;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return null;
}
}
private string GetDotNetType(string dbColumnType)
{
string returnType = string.Empty;
if (dbColumnType.Equals("nvarchar"))
returnType = "string";
else if (dbColumnType.Equals("varchar"))
returnType = "string";
else if (dbColumnType.Equals("int"))
returnType = "int";
else if (dbColumnType.Equals("bit"))
returnType = "bool";
else if (dbColumnType.Equals("bigint"))
returnType = "long";
else if (dbColumnType.Equals("binary"))
returnType = "byte[]";
else if (dbColumnType.Equals("char"))
returnType = "string";
else if (dbColumnType.Equals("date"))
returnType = "DateTime";
else if (dbColumnType.Equals("datetime"))
returnType = "DateTime";
else if (dbColumnType.Equals("datetime2"))
returnType = "DateTime";
else if (dbColumnType.Equals("datetimeoffset"))
returnType = "DateTimeOffset";
else if (dbColumnType.Equals("decimal"))
returnType = "decimal";
else if (dbColumnType.Equals("float"))
returnType = "float";
else if (dbColumnType.Equals("image"))
returnType = "byte[]";
else if (dbColumnType.Equals("money"))
returnType = "decimal";
else if (dbColumnType.Equals("nchar"))
returnType = "char";
else if (dbColumnType.Equals("ntext"))
returnType = "string";
else if (dbColumnType.Equals("numeric"))
returnType = "decimal";
else if (dbColumnType.Equals("nvarchar"))
returnType = "string";
else if (dbColumnType.Equals("real"))
returnType = "double";
else if (dbColumnType.Equals("smalldatetime"))
returnType = "DateTime";
else if (dbColumnType.Equals("smallint"))
returnType = "short";
else if (dbColumnType.Equals("smallmoney"))
returnType = "decimal";
else if (dbColumnType.Equals("text"))
returnType = "string";
else if (dbColumnType.Equals("time"))
returnType = "TimeSpan";
else if (dbColumnType.Equals("timestamp"))
returnType = "DateTime";
else if (dbColumnType.Equals("tinyint"))
returnType = "byte";
else if (dbColumnType.Equals("uniqueidentifier"))
returnType = "Guid";
else if (dbColumnType.Equals("varbinary"))
returnType = "byte[]";
return returnType;
}
private void CreateClassTop(StreamWriter sw, string lstrTableName)
{
System.Text.StringBuilder sb = null;
sb = new StringBuilder("public class " + lstrTableName +"Entity\n{");
sw.Write(sb.ToString());
}
private void CreateClassBody(StreamWriter sw, string lstrAttributeType, string lstrAttributeName)
{
System.Text.StringBuilder sb = null;
sb = new StringBuilder("\n\rpublic " + lstrAttributeType + " " + lstrAttributeName + " { get; set; }");
sw.Write(sb.ToString());
}
private void CreateClassBottom(StreamWriter sw)
{
System.Text.StringBuilder sb = null;
sb = new StringBuilder("\n\n}");
sw.Write(sb.ToString());
}
}
}
【讨论】：
不自动生成，但使用 sql 和 information_schema 输出类定义并不难，类以表命名，列映射到属性。从那里你可以让它生成创建、更新和删除（我喜欢在 SQL Server 2008 下将合并用于板条箱/更新）。
一次做一个，主要是字符串连接。下面应该让你开始......
declare @class varchar(max);
; with typemapping as (
Select 'varchar' as DATA_TYPE, 'string' ctype
union
Select 'int', 'int'
)
select @class = isnull(@class + char(10), '') + 'public ' +
tm.ctype +' ' + column_name +
' { get; set; }'
from information_schema.columns sc
inner join typemapping tm on sc.data_type = tm.data_type
where table _name ='yourtbl'
print @class;
其余的留给读者作为练习，因为他们说主要是因为细节取决于您，而不是自动属性，您可以使用支持变量，将标准逻辑放入属性中，使值类型可以为空，当您自己的代码生成器，使其适合您的模式/样式/需求。
【讨论】：
你可以试试这样的...
创建一个名为 ModelCreator.cs 的主类，用于执行所有关键操作。此应用程序的入口点是 Connect and Create 按钮单击事件。它将触发一个 CreateConnectionString() 方法，该方法基本上从用户那里获取输入并动态创建连接字符串
private void lbtnConnect_Click(object sender, System.EventArgs e)
{
if (CreateConnectionString())
CreateModelClassFiles(tcGetDataReader());
}
// <summary>
/// Get the SqlDataReader object
/// SqlDataReader
/// </summary>
public SqlDataReader tcGetDataReader()
{
SqlConnection connection = null;
try
{
connection = GetConnection(SQL_CONN_STRING);
if (connection == null)
return null;
SqlDataReader dr = SqlHelper.ExecuteReader(
connection,
CommandType.StoredProcedure,
"getData");
if (dr.HasRows)
return dr;
else
return null;
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
return null;
}
}
从数据库中获取表名、属性及其类型
CREATE PROCEDURE getData AS
select table_name, column_name, data_type
from information_schema.columns
where table_name in
(
select table_name
from Information_Schema.Tables
where Table_Type='Base Table'
) order by table_name
GO
主方法，CreateModelClassFiles
/// <summary>
/// Create the Model class list iterating through the tables
/// </summary>
/// <param name="dr">Sql Data reader for the database schema</param>
private void CreateModelClassFiles(SqlDataReader dr)
{
if (dr != null)
{
string lstrOldTableName = string.Empty;
StreamWriter sw = null;
System.Text.StringBuilder sb = null;
System.Text.StringBuilder sbAttr = null;
while(dr.Read())
{
string lstrTableName = dr.GetString(0);
string lstrAttributeName = dr.GetString(1);
string lstrAttributeType = GetSystemType(dr.GetString(2));
if (lstrOldTableName != lstrTableName)
{
if (sw != null)
{
this.CreateClassBottom(sw, sb.ToString().TrimEnd(
new char[]{',', ' ', '\r', '\t', '\n'}),
sbAttr.ToString());
sw.Close();
}
sb = new System.Text.StringBuilder(lstrTableName);
sb.Append(".cs");
FileInfo lobjFileInfo = new FileInfo(sb.ToString());
sw = lobjFileInfo.CreateText();
this.CreateClassTop(sw, lstrTableName);
sb = new System.Text.StringBuilder("\r\n\t/// \r\n\t" +
"/// User defined Contructor\r\n\t/// \r\n\tpublic ");
sbAttr = new System.Text.StringBuilder();
sb.Append(lstrTableName);
sb.Append("(");
}
else
{
this.CreateClassBody(sw, lstrAttributeType, lstrAttributeName);
sb.AppendFormat("{0} {1}, \r\n\t\t",
new object[]{lstrAttributeType, lstrAttributeName});
sbAttr.AppendFormat("\r\n\t\tthis._{0} = {0};",
new object[]{lstrAttributeName});
}
lstrOldTableName = lstrTableName;
this.progressBarMain.Increment(1);
}
MessageBox.Show("Done !!");
}
}
一旦调用此方法，它就会为您做所有事情。
希望对你有帮助....
【讨论】：
如果您使用实体框架，请查看本文的步骤：
Generating EF Code First model classes from an existing database
【讨论】：