Created
July 1, 2017 08:26
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Generate C# POCOs from SQL statement in LINQPad
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public static class LINQPadExtensions | |
{ | |
private static readonly Dictionary<Type, string> TypeAliases = new Dictionary<Type, string> { | |
{ typeof(int), "int" }, | |
{ typeof(short), "short" }, | |
{ typeof(byte), "byte" }, | |
{ typeof(byte[]), "byte[]" }, | |
{ typeof(long), "long" }, | |
{ typeof(double), "double" }, | |
{ typeof(decimal), "decimal" }, | |
{ typeof(float), "float" }, | |
{ typeof(bool), "bool" }, | |
{ typeof(string), "string" } | |
}; | |
private static readonly HashSet<Type> NullableTypes = new HashSet<Type> { | |
typeof(int), | |
typeof(short), | |
typeof(long), | |
typeof(double), | |
typeof(decimal), | |
typeof(float), | |
typeof(bool), | |
typeof(DateTime) | |
}; | |
public static string DumpClass(this IDbConnection connection, string sql) | |
{ | |
if(connection.State != ConnectionState.Open) | |
connection.Open(); | |
var cmd = connection.CreateCommand(); | |
cmd.CommandText = sql; | |
var reader = cmd.ExecuteReader(); | |
var builder = new StringBuilder(); | |
do | |
{ | |
if(reader.FieldCount <= 1) continue; | |
builder.AppendLine("public class Info"); | |
builder.AppendLine("{"); | |
var schema = reader.GetSchemaTable(); | |
foreach (DataRow row in schema.Rows) | |
{ | |
var type = (Type)row["DataType"]; | |
var name = TypeAliases.ContainsKey(type) ? TypeAliases[type] : type.Name; | |
var isNullable = (bool)row["AllowDBNull"] && NullableTypes.Contains(type); | |
var collumnName = (string)row["ColumnName"]; | |
builder.AppendLine(string.Format("\tpublic {0}{1} {2} ", name, isNullable ? "?" : string.Empty, collumnName)); | |
} | |
builder.AppendLine("}"); | |
builder.AppendLine(); | |
} while(reader.NextResult()); | |
return builder.ToString(); | |
} | |
} |
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http://www.necronet.org/archive/2012/10/09/generate-c-pocos-from-sql-statement-in-linqpad.aspx
Usage:
this.Connection.DumpClass("select * from SomeTable")