Pomelo.EntityFrameworkCore.MySql problem when access property - mysql

Question

Today I migrate my project to .NET 6 with MySql db.
I tried Pomelo.EntityFrameworkCore.MySql for the first time but several errors had occur.
I fixed some of them but the last one, I couldn`t.
System.InvalidOperationException: The property 'SqlClass.Disabled' is of type 'byte' which is not supported by the current database provider. Either change the property CLR type, or ignore the property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.
entity.Property(e => e.Disabled)
//.HasConversion<int>()
.IsRequired()
.HasMaxLength(255)
.HasColumnName("disabled")
.HasColumnType("tinyint(1)");
[Required]
[MaxLength(255)]
public byte Disabled { get; set; }
Any ideas ? Thank you.

Answer 1

There are basically 3 simple options, all demonstrated here with the IceCream.Available property:
1. Use System.Boolean instead of System.Byte
Pomelo translates tinyint(1) to System.Boolean by default. So if you change the CLR type of your property from byte to bool, it works out-of-the box:
Program.cs
using System.ComponentModel.DataAnnotations;
using System.Diagnostics;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
namespace IssueConsoleTemplate
{
public class IceCream
{
public int IceCreamId { get; set; }
public string Name { get; set; }
[Required]
[Column(TypeName = "tinyint(1)")] // <-- redundant (bool is translated to tinyint(1) by default)
public bool Available { get; set; } // <-- use bool
}
public class Context : DbContext
{
public DbSet<IceCream> IceCreams { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
var connectionString = "server=127.0.0.1;port=3306;user=root;password=;database=So70198786";
var serverVersion = ServerVersion.AutoDetect(connectionString);
optionsBuilder
.UseMySql(connectionString, serverVersion)
.UseLoggerFactory(
LoggerFactory.Create(
b => b
.AddConsole()
.AddFilter(level => level >= LogLevel.Information)))
.EnableSensitiveDataLogging()
.EnableDetailedErrors();
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<IceCream>(
entity =>
{
// Not needed if you are using data annotations:
//
// entity.Property(e => e.Available)
// .IsRequired()
// .HasColumnType("tinyint(1)"); // <-- redundant (bool is translated to tinyint(1) by default)
entity.HasData(
new IceCream
{
IceCreamId = 1,
Name = "Vanilla",
Available = true, // <-- bool
},
new IceCream
{
IceCreamId = 2,
Name = "Chocolate",
Available = false, // <-- bool
});
});
}
}
internal static class Program
{
private static void Main()
{
using var context = new Context();
context.Database.EnsureDeleted();
context.Database.EnsureCreated();
var availableIceCreams = context.IceCreams
.Where(i => i.Available) // <-- bool
.ToList();
Trace.Assert(availableIceCreams.Count == 1);
Trace.Assert(availableIceCreams[0].Name == "Vanilla");
}
}
}
Output (SQL)
warn: Microsoft.EntityFrameworkCore.Model.Validation[10400]
Sensitive data logging is enabled. Log entries and exception messages may include sensitive application data; this mode should only be enabled during development.
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
Entity Framework Core 6.0.0 initialized 'Context' using provider 'Pomelo.EntityFrameworkCore.MySql:6.0.0-rtm.1' with options: ServerVersion 8.0.25-mysql SensitiveDataLoggingEnabled DetailedErrorsEnabled
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (38ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
DROP DATABASE `So70198786`;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (13ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE DATABASE `So70198786`;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (15ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER DATABASE CHARACTER SET utf8mb4;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (47ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE `IceCreams` (
`IceCreamId` int NOT NULL AUTO_INCREMENT,
`Name` longtext CHARACTER SET utf8mb4 NULL,
`Available` tinyint(1) NOT NULL,
CONSTRAINT `PK_IceCreams` PRIMARY KEY (`IceCreamId`)
) CHARACTER SET=utf8mb4;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (9ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO `IceCreams` (`IceCreamId`, `Available`, `Name`)
VALUES (1, TRUE, 'Vanilla');
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (10ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO `IceCreams` (`IceCreamId`, `Available`, `Name`)
VALUES (2, FALSE, 'Chocolate');
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (5ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT `i`.`IceCreamId`, `i`.`Available`, `i`.`Name`
FROM `IceCreams` AS `i`
WHERE `i`.`Available`
2. Use tinyint instead of tinyint(1)
In case you definitely want to use System.Byte as the CLR type of your property, use tinyint instead of tinyint(1). All tinyint except tinyint(1) are translated to System.Byte by default:
Program.cs
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Diagnostics;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
namespace IssueConsoleTemplate
{
public class IceCream
{
public int IceCreamId { get; set; }
public string Name { get; set; }
[Required]
[Column(TypeName = "tinyint")] // <-- redundant (byte is translated to tinyint by default)
public byte Available { get; set; }
}
public class Context : DbContext
{
public DbSet<IceCream> IceCreams { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
var connectionString = "server=127.0.0.1;port=3306;user=root;password=;database=So70198786_01";
var serverVersion = ServerVersion.AutoDetect(connectionString);
optionsBuilder
.UseMySql(connectionString, serverVersion)
.UseLoggerFactory(
LoggerFactory.Create(
b => b
.AddConsole()
.AddFilter(level => level >= LogLevel.Information)))
.EnableSensitiveDataLogging()
.EnableDetailedErrors();
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<IceCream>(
entity =>
{
// Not needed if you are using data annotations:
//
// entity.Property(e => e.Available)
// .IsRequired()
// .HasColumnType("tinyint"); // <-- redundant (byte is translated to tinyint by default)
entity.HasData(
new IceCream
{
IceCreamId = 1,
Name = "Vanilla",
Available = 1, // <-- byte
},
new IceCream
{
IceCreamId = 2,
Name = "Chocolate",
Available = 0, // <-- byte
});
});
}
}
internal static class Program
{
private static void Main()
{
using var context = new Context();
context.Database.EnsureDeleted();
context.Database.EnsureCreated();
var availableIceCreams = context.IceCreams
.Where(i => i.Available != 0) // <-- byte
.ToList();
Trace.Assert(availableIceCreams.Count == 1);
Trace.Assert(availableIceCreams[0].Name == "Vanilla");
}
}
}
Output (SQL)
warn: Microsoft.EntityFrameworkCore.Model.Validation[10400]
Sensitive data logging is enabled. Log entries and exception messages may include sensitive application data; this mode should only be enabled during development.
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
Entity Framework Core 6.0.0 initialized 'Context' using provider 'Pomelo.EntityFrameworkCore.MySql:6.0.0-rtm.1' with options: ServerVersion 8.0.25-mysql SensitiveDataLoggingEnabled DetailedErrorsEnabled
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (42ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
DROP DATABASE `So70198786_01`;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (41ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE DATABASE `So70198786_01`;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (19ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER DATABASE CHARACTER SET utf8mb4;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (48ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE `IceCreams` (
`IceCreamId` int NOT NULL AUTO_INCREMENT,
`Name` longtext CHARACTER SET utf8mb4 NULL,
`Available` tinyint NOT NULL,
CONSTRAINT `PK_IceCreams` PRIMARY KEY (`IceCreamId`)
) CHARACTER SET=utf8mb4;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (9ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO `IceCreams` (`IceCreamId`, `Available`, `Name`)
VALUES (1, 1, 'Vanilla');
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (10ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO `IceCreams` (`IceCreamId`, `Available`, `Name`)
VALUES (2, 0, 'Chocolate');
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (6ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT `i`.`IceCreamId`, `i`.`Available`, `i`.`Name`
FROM `IceCreams` AS `i`
WHERE `i`.`Available` <> 0
3. Change default System.Boolean mapping to bit(1) or remove it altogether
Finally, if you need to map exactly tinyint(1) to System.Byte, then you can change the default mapping that Pomelo is using for System.Boolean by setting a DbContext option in your UseMySql() call:
Program.cs
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Diagnostics;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Pomelo.EntityFrameworkCore.MySql.Infrastructure;
namespace IssueConsoleTemplate
{
public class IceCream
{
public int IceCreamId { get; set; }
public string Name { get; set; }
[Required]
[Column(TypeName = "tinyint(1)")] // <-- necessary (otherwise gets translated to tinyint)
public byte Available { get; set; }
}
public class Context : DbContext
{
public DbSet<IceCream> IceCreams { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
var connectionString = "server=127.0.0.1;port=3306;user=root;password=;database=So70198786_02";
var serverVersion = ServerVersion.AutoDetect(connectionString);
optionsBuilder
.UseMySql(
connectionString,
serverVersion,
options => options.DefaultDataTypeMappings( // <-- change default data type mappings
m => m.WithClrBoolean(MySqlBooleanType.Bit1))) // <-- or even MySqlBooleanType.None
.UseLoggerFactory(
LoggerFactory.Create(
b => b
.AddConsole()
.AddFilter(level => level >= LogLevel.Information)))
.EnableSensitiveDataLogging()
.EnableDetailedErrors();
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<IceCream>(
entity =>
{
// Not needed if you are using data annotations:
//
// entity.Property(e => e.Available)
// .IsRequired()
// .HasColumnType("tinyint(1)"); // <-- necessary (otherwise gets translated to tinyint)
entity.HasData(
new IceCream
{
IceCreamId = 1,
Name = "Vanilla",
Available = 1, // <-- byte
},
new IceCream
{
IceCreamId = 2,
Name = "Chocolate",
Available = 0, // <-- byte
});
});
}
}
internal static class Program
{
private static void Main()
{
using var context = new Context();
context.Database.EnsureDeleted();
context.Database.EnsureCreated();
var availableIceCreams = context.IceCreams
.Where(i => i.Available != 0) // <-- byte
.ToList();
Trace.Assert(availableIceCreams.Count == 1);
Trace.Assert(availableIceCreams[0].Name == "Vanilla");
}
}
}
Output (SQL)
warn: Microsoft.EntityFrameworkCore.Model.Validation[10400]
Sensitive data logging is enabled. Log entries and exception messages may include sensitive application data; this mode should only be enabled during development.
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
Entity Framework Core 6.0.0 initialized 'Context' using provider 'Pomelo.EntityFrameworkCore.MySql:6.0.0-rtm.1' with options: ServerVersion 8.0.25-mysql SensitiveDataLoggingEnabled DetailedErrorsEnabled
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (40ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
DROP DATABASE `So70198786_02`;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (13ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE DATABASE `So70198786_02`;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (19ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
ALTER DATABASE CHARACTER SET utf8mb4;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (86ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE `IceCreams` (
`IceCreamId` int NOT NULL AUTO_INCREMENT,
`Name` longtext CHARACTER SET utf8mb4 NULL,
`Available` tinyint(1) NOT NULL,
CONSTRAINT `PK_IceCreams` PRIMARY KEY (`IceCreamId`)
) CHARACTER SET=utf8mb4;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (7ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO `IceCreams` (`IceCreamId`, `Available`, `Name`)
VALUES (1, 1, 'Vanilla');
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
INSERT INTO `IceCreams` (`IceCreamId`, `Available`, `Name`)
VALUES (2, 0, 'Chocolate');
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
Executed DbCommand (7ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT `i`.`IceCreamId`, `i`.`Available`, `i`.`Name`
FROM `IceCreams` AS `i`
WHERE `i`.`Available` <> 0
Unrelated to the topic of this question, [MaxLength(255)] or .HasMaxLength(255) have no effect on non-string columns.