Entity Framework MigrationSqlGenerator for SQLite
本文关键字：SQLite for MigrationSqlGenerator Framework Entity | 更新日期: 2023-09-27 18:08:01
是否有一个MigrationSqlGenerator为SQLite使用实体框架?我只在devart找到了一个商业的。
没有MigrationSqlGenerator找到提供程序'System.Data.SQLite'。使用目标迁移配置中的SetSqlGenerator方法
我是这样做的:http://msdn.microsoft.com/en-gb/data/jj591621
对于任何正在寻找处理迁移的生成器的人，我在https://sqliteef6migrations.codeplex.com上找到了一个名为"System.Data.SQLite.EF6.Migrations"的nuget包。
安装完包后，您需要对Migrations Configuration Method进行以下更改。
public Configuration()
{
AutomaticMigrationsEnabled = false;
SetSqlGenerator("System.Data.SQLite", new SQLiteMigrationSqlGenerator());
}
完整的类应该是这样的:
namespace YourNamespace
{
using System.Data.Entity.Migrations;
using System.Data.SQLite.EF6.Migrations;
internal sealed class Configuration : DbMigrationsConfiguration<YourContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = false;
SetSqlGenerator("System.Data.SQLite", new SQLiteMigrationSqlGenerator());
}
protected override void Seed(YourContext context)
{
// This method will be called after migrating to the latest version.
}
}
}
据我所知，我不认为有免费的。
如果你不关心Devart商业dotConnect for SQLite -你可以尝试自己实现一个-它可能不那么简单，但你有EF源代码在你的处理(对于EF6，但我想说这些部分非常相似)。
http://entityframework.codeplex.com/
如果你看一下SqlCeMigrationSqlGenerator的源代码(另一个源代码，我在官方网站上找不到，但你可以下载和检查)
…您将看到该生成器相对简单。当然，Ce也是如此，它使用标准Sql客户端作为底层生成器。
SQLite将需要更多的工作，但可能不是那么难。
同样，类似的事情也来自EF的一个众所周知的来源——我们可以在MySql中使用EF迁移吗
不要对我大喊大叫:)我知道这不是你想要的，但我认为这是唯一的选择。
http://entityframework.codeplex.com/
SqlCeMigrationSqlGenerator
MySql可以使用EF迁移吗
虽然这个帖子已经开放了很长时间，但我还是会根据我们的朋友NSGaga的出现来发布我要做的事情。
我设法创建了一个类"MigrationSqLiteGenerator"，基于为SQLCE开发的。类的代码太大，更多的可以在我的博客上下载。
Google Drive:https://drive.google.com/file/d/0B-NCqWnMQpBrQjkxMkxnVlRzb00/view?usp=sharing
这个类只有基本的，plus是一个改进的起点。
22. mar.2017编辑@shiva:这是内联的代码，所以如果谷歌驱动器链接再次中断，你仍然可以访问代码。刚刚发现SO在回答帖子中有30,000字符限制，所以我不得不删除代码中的评论。它是超过32,000字符的注释:)
// *-----------------------------------------------------------------*
// * *
// * CRIADO POR...: Julio C. Borges. *
// * DATA.........: 19/07/2013. *
// * MOTIVO.......: *
// * *
// *-----------------------------------------------------------------*
using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Data.Common;
using System.Data.Entity.Migrations.Model;
using System.Data.Entity.Migrations.Sql;
using System.Data.Metadata.Edm;
using System.Data.SQLite;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
namespace ICM_Conexao.SqLite.Classes
{
/// <sumary>
/// MigrationSqLiteGenerator
/// </sumary>
public class MigrationSqLiteGenerator : MigrationSqlGenerator
{
#region Constantes
private const string pstrDefaultDateTime = "yyyy-MM-dd hh:mm:ss";
private const int pintDefaultStringMaxLength = 255;
private const int pintDefaultPrecisaoNumerica = 10;
private const byte pbytDefaultPrecisaoTempo = 7;
private const byte pintDefaultEscala = 0;
//private const string pstrNomeTabelaMigration = "__MigrationHistory";
#endregion
#region Instancias
private DbProviderManifest pprovProviderManifest;
private List<MigrationStatement> plstComandos;
private bool pblnGerouPrimaryKey;
#endregion
#region Método de Geração sobrescrito de MigratioSqlGenerator
public override IEnumerable<MigrationStatement> Generate(
IEnumerable<MigrationOperation> lstOperacoesMigrations, string strManifestoProvider)
{
plstComandos = new List<MigrationStatement>();
InicializaServicosProvider(strManifestoProvider);
GeraComandos(lstOperacoesMigrations);
return plstComandos;
}
#endregion
#region Métodos de geração dos comandos
protected virtual void Generate(CreateTableOperation opeCriacaoTabela)
{
// Preferencialmente não iremos gerar a tabela de dados do Migration
if (opeCriacaoTabela.Name.Contains("MigrationHistory"))
return;
using (var ltextWriter = TextWriter())
{
GeraComandoCriacaoTabela(opeCriacaoTabela, ltextWriter);
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(AddForeignKeyOperation opeChaveEstrangeira)
{
// Inicialmente não havera a criação de chave estrangeira
}
protected virtual void Generate(DropForeignKeyOperation dropForeignKeyOperation)
{
// Inicalmente não haverá a criação de chave estrangeira
}
protected virtual void Generate(CreateIndexOperation opeCriacaoIndex)
{
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("CREATE ");
if (opeCriacaoIndex.IsUnique)
ltextWriter.Write(" UNIQUE ");
ltextWriter.Write("INDEX ");
ltextWriter.Write(opeCriacaoIndex.Name);
ltextWriter.Write(" ON ");
ltextWriter.Write(RemoveDBO(opeCriacaoIndex.Table));
ltextWriter.Write("(");
for (int lintCount = 0; lintCount < opeCriacaoIndex.Columns.Count; lintCount++)
{
var lstrDadosColuna = opeCriacaoIndex.Columns[lintCount];
ltextWriter.Write(lstrDadosColuna);
if (lintCount < opeCriacaoIndex.Columns.Count - 1)
ltextWriter.WriteLine(",");
}
ltextWriter.Write(")");
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(DropIndexOperation opeDropIndex)
{
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("DROP INDEX ");
ltextWriter.Write(opeDropIndex.Name);
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(AddPrimaryKeyOperation opeAdicionaPrimaryKey)
{
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("ALTER TABLE ");
ltextWriter.Write(RemoveDBO(opeAdicionaPrimaryKey.Table));
ltextWriter.Write(" ADD CONSTRAINT ");
ltextWriter.Write(opeAdicionaPrimaryKey.Name);
ltextWriter.Write(" PRIMARY KEY ");
ltextWriter.Write("(");
for (int li = 0; li < opeAdicionaPrimaryKey.Columns.Count; li++)
{
var lstrDadosColuna = opeAdicionaPrimaryKey.Columns[li];
ltextWriter.Write(lstrDadosColuna);
if (li < opeAdicionaPrimaryKey.Columns.Count - 1)
ltextWriter.WriteLine(",");
}
ltextWriter.Write(")");
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(DropPrimaryKeyOperation opeDropPrimaryKey)
{
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("ALTER TABLE ");
ltextWriter.Write(RemoveDBO(opeDropPrimaryKey.Table));
ltextWriter.Write(" DROP CONSTRAINT ");
ltextWriter.Write(opeDropPrimaryKey.Name);
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(AddColumnOperation opeAdicionaColuna)
{
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("ALTER TABLE ");
ltextWriter.Write(RemoveDBO(opeAdicionaColuna.Table));
ltextWriter.Write(" ADD ");
var lcmColuna = opeAdicionaColuna.Column;
Generate(lcmColuna, ltextWriter, null);
if ((lcmColuna.IsNullable != null)
&& !lcmColuna.IsNullable.Value
&& (lcmColuna.DefaultValue == null)
&& (string.IsNullOrWhiteSpace(lcmColuna.DefaultValueSql))
&& !lcmColuna.IsIdentity
&& !lcmColuna.IsTimestamp
&& !lcmColuna.StoreType.Equals("rowversion", StringComparison.InvariantCultureIgnoreCase)
&& !lcmColuna.StoreType.Equals("timestamp", StringComparison.InvariantCultureIgnoreCase))
{
ltextWriter.Write(" DEFAULT ");
if (lcmColuna.Type == PrimitiveTypeKind.DateTime)
{
ltextWriter.Write(Generate(DateTime.Parse("1900-01-01 00:00:00", CultureInfo.InvariantCulture)));
}
else
{
ltextWriter.Write(Generate((dynamic)lcmColuna.ClrDefaultValue));
}
}
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(DropColumnOperation opeRemoveColuna)
{
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("ALTER TABLE ");
ltextWriter.Write(RemoveDBO(opeRemoveColuna.Table));
ltextWriter.Write(" DROP COLUMN ");
ltextWriter.Write(opeRemoveColuna.Name);
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(AlterColumnOperation opeAlteraColuna)
{
var lcmColuna = opeAlteraColuna.Column;
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("ALTER TABLE ");
ltextWriter.Write(RemoveDBO(opeAlteraColuna.Table));
ltextWriter.Write(" ALTER COLUMN ");
ltextWriter.Write(lcmColuna.Name);
ltextWriter.Write(" ");
ltextWriter.Write(ConstruirTipoColuna(lcmColuna));
if ((lcmColuna.IsNullable != null)
&& !lcmColuna.IsNullable.Value)
{
ltextWriter.Write(" NOT NULL");
}
ComandoSQL(ltextWriter);
}
if ((lcmColuna.DefaultValue == null) && string.IsNullOrWhiteSpace(lcmColuna.DefaultValueSql))
return;
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("ALTER TABLE ");
ltextWriter.Write(RemoveDBO(opeAlteraColuna.Table));
ltextWriter.Write(" ALTER COLUMN ");
ltextWriter.Write(lcmColuna.Name);
ltextWriter.Write(" DROP DEFAULT");
ComandoSQL(ltextWriter);
}
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("ALTER TABLE ");
ltextWriter.Write(RemoveDBO(opeAlteraColuna.Table));
ltextWriter.Write(" ALTER COLUMN ");
ltextWriter.Write(lcmColuna.Name);
ltextWriter.Write(" SET DEFAULT ");
ltextWriter.Write(
(lcmColuna.DefaultValue != null)
? Generate((dynamic)lcmColuna.DefaultValue)
: lcmColuna.DefaultValueSql
);
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(DropTableOperation opeDropTable)
{
using (var ltextWriter = TextWriter())
{
ltextWriter.Write("DROP TABLE ");
ltextWriter.Write(RemoveDBO(opeDropTable.Name));
ComandoSQL(ltextWriter);
}
}
protected virtual void Generate(SqlOperation opeSQL)
{
ComandoSQL(opeSQL.Sql, opeSQL.SuppressTransaction);
}
protected virtual void Generate(RenameColumnOperation opeRenomearColuna)
{
// Inicialmente não suportada
}
protected virtual void Generate(RenameTableOperation opeRenameTable)
{
}
protected virtual void Generate(MoveTableOperation opeMoveTable)
{
}
private void Generate(ColumnModel cmDadosColuna, IndentedTextWriter textWriter, PrimaryKeyOperation opePrimaryKey)
{
textWriter.Write(cmDadosColuna.Name);
textWriter.Write(" ");
bool lblnEhPrimaryKey = false;
if (opePrimaryKey != null)
lblnEhPrimaryKey = opePrimaryKey.Columns.Contains(cmDadosColuna.Name);
if (lblnEhPrimaryKey)
{
if ((cmDadosColuna.Type == PrimitiveTypeKind.Int16) ||
(cmDadosColuna.Type == PrimitiveTypeKind.Int32))
textWriter.Write(" INTEGER ");
else
textWriter.Write(ConstruirTipoColuna(cmDadosColuna));
if (cmDadosColuna.IsIdentity)
{
textWriter.Write(" PRIMARY KEY AUTOINCREMENT ");
pblnGerouPrimaryKey = true;
}
}
else
{
textWriter.Write(ConstruirTipoColuna(cmDadosColuna));
if ((cmDadosColuna.IsNullable != null)
&& !cmDadosColuna.IsNullable.Value)
{
textWriter.Write(" NOT NULL");
}
if (cmDadosColuna.DefaultValue != null)
{
textWriter.Write(" DEFAULT ");
textWriter.Write(Generate((dynamic)cmDadosColuna.DefaultValue));
}
else if (!string.IsNullOrWhiteSpace(cmDadosColuna.DefaultValueSql))
{
textWriter.Write(" DEFAULT ");
textWriter.Write(cmDadosColuna.DefaultValueSql);
}
}
}
protected virtual void Generate(HistoryOperation opeHistorico)
{
// Foi removido, pois atualmente não usaremos o Migration
//using (var ltextWriter = TextWriter())
//{
// if (opeHistorico is InsertHistoryOperation)
// {
// InsertHistoryOperation lhisOperacaoInsert = opeHistorico as InsertHistoryOperation;
// ltextWriter.Write(" INSERT INTO ");
// ltextWriter.Write(pstrNomeTabelaMigration);
// ltextWriter.Write(" ( MigrationId, Model, ProductVersion) VALUES ");
// ltextWriter.Write(string.Format(" ('{0}', {1}, '{2}')",
// lhisOperacaoInsert.MigrationId,
// Generate(lhisOperacaoInsert.Model), lhisOperacaoInsert.ProductVersion));
// }
// else if (opeHistorico is DeleteHistoryOperation)
// {
// DeleteHistoryOperation lhisOperacaoInsert = opeHistorico as DeleteHistoryOperation;
// ltextWriter.Write(" DELETE FROM ");
// ltextWriter.Write(pstrNomeTabelaMigration);
// ltextWriter.Write(string.Format(" WHERE MigrationId = '{0}'",
// lhisOperacaoInsert.MigrationId));
// }
// ComandoSQL(ltextWriter);
//}
}
protected virtual string Generate(byte[] bytDefaultValue)
{
var lstrbHexString = new StringBuilder();
foreach (var lbtByte in bytDefaultValue)
lstrbHexString.Append(lbtByte.ToString("X2", CultureInfo.InvariantCulture));
return "x'" + lstrbHexString + "'";
}
protected virtual string Generate(bool blnDefaultValue)
{
return blnDefaultValue ? "1" : "0";
}
protected virtual string Generate(DateTime dtmDefaultValue)
{
return "'" + dtmDefaultValue.ToString(pstrDefaultDateTime, CultureInfo.InvariantCulture) + "'";
}
protected virtual string Generate(DateTimeOffset dtfDefaultValue)
{
return "'" + dtfDefaultValue.ToString(pstrDefaultDateTime, CultureInfo.InvariantCulture) + "'";
}
protected virtual string Generate(Guid guidDefaultValue)
{
return "'" + guidDefaultValue + "'";
}
protected virtual string Generate(string strDefaultValue)
{
return "'" + strDefaultValue + "'";
}
protected virtual string Generate(TimeSpan tsDefaultValue)
{
return "'" + tsDefaultValue + "'";
}
protected virtual string Generate(object objDefaultValue)
{
return string.Format(CultureInfo.InvariantCulture, "{0}", objDefaultValue);
}
#endregion
#region Métodos auxiliares
protected virtual string ConstruirTipoColuna(ColumnModel cmModeloColuna)
{
return cmModeloColuna.IsTimestamp ? "rowversion" : ConstruirTipoPropriedade(cmModeloColuna);
}
private string ConstruirTipoPropriedade(ColumnModel propModeloPropriedade)
{
var lstrOriginalStoreTypeName = propModeloPropriedade.StoreType;
if (string.IsNullOrWhiteSpace(lstrOriginalStoreTypeName))
{
var ltypeUsage = pprovProviderManifest.GetStoreType(propModeloPropriedade.TypeUsage).EdmType;
lstrOriginalStoreTypeName = ltypeUsage.Name;
}
var lstrStoreTypeName = lstrOriginalStoreTypeName;
const string lstrSufixoMax = "(max)";
if (lstrStoreTypeName.EndsWith(lstrSufixoMax, StringComparison.Ordinal))
lstrStoreTypeName = lstrStoreTypeName.Substring(0, lstrStoreTypeName.Length - lstrSufixoMax.Length) + lstrSufixoMax;
switch (lstrOriginalStoreTypeName.ToLowerInvariant())
{
case "decimal":
case "numeric":
lstrStoreTypeName += "(" + (propModeloPropriedade.Precision ?? pintDefaultPrecisaoNumerica)
+ ", " + (propModeloPropriedade.Scale ?? pintDefaultEscala) + ")";
break;
case "datetime":
case "time":
lstrStoreTypeName += "(" + (propModeloPropriedade.Precision ?? pbytDefaultPrecisaoTempo) + ")";
break;
case "blob":
case "varchar2":
case "varchar":
case "char":
case "nvarchar":
case "nvarchar2":
lstrStoreTypeName += "(" + (propModeloPropriedade.MaxLength ?? pintDefaultStringMaxLength) + ")";
break;
}
return lstrStoreTypeName;
}
protected void ComandoSQL(string strInstrucaoSQL, bool blnSuprimeTransacao = false)
{
plstComandos.Add(new MigrationStatement
{
Sql = strInstrucaoSQL,
SuppressTransaction = blnSuprimeTransacao
});
}
protected void ComandoSQL(IndentedTextWriter writer)
{
ComandoSQL(writer.InnerWriter.ToString());
}
protected static IndentedTextWriter TextWriter()
{
return new IndentedTextWriter(new StringWriter(CultureInfo.InvariantCulture));
}
private static string RemoveDBO(string strTexto)
{
return strTexto.Replace("dbo.", string.Empty);
}
private void GeraComandos(IEnumerable<MigrationOperation> lstOperacoesMigrations)
{
foreach (dynamic ldynOperacao in lstOperacoesMigrations)
Generate(ldynOperacao);
}
private void InicializaServicosProvider(string strManifestoProvider)
{
using (var lconConexao = CreateConnection())
{
pprovProviderManifest = DbProviderServices
.GetProviderServices(lconConexao)
.GetProviderManifest(strManifestoProvider);
}
}
protected virtual DbConnection CreateConnection()
{
return new SQLiteConnection();
}
private void GeraComandoCriacaoTabela(CreateTableOperation opeCriacaoTabela, IndentedTextWriter textWriter)
{
textWriter.WriteLine("CREATE TABLE " + RemoveDBO(opeCriacaoTabela.Name) + " (");
textWriter.Indent++;
for (int i = 0; i < opeCriacaoTabela.Columns.Count; i++)
{
ColumnModel lcmDadosColuna = opeCriacaoTabela.Columns.ToList()[i];
Generate(lcmDadosColuna, textWriter, opeCriacaoTabela.PrimaryKey);
if (i < opeCriacaoTabela.Columns.Count - 1)
textWriter.WriteLine(",");
}
if ((opeCriacaoTabela.PrimaryKey != null) && !pblnGerouPrimaryKey)
{
textWriter.WriteLine(",");
textWriter.Write("CONSTRAINT ");
textWriter.Write(RemoveDBO(opeCriacaoTabela.PrimaryKey.Name));
textWriter.Write(" PRIMARY KEY ");
textWriter.Write("(");
for (int li = 0; li < opeCriacaoTabela.PrimaryKey.Columns.Count; li++)
{
var lstrNomeColuna = opeCriacaoTabela.PrimaryKey.Columns[li];
textWriter.Write(lstrNomeColuna);
if (li < opeCriacaoTabela.PrimaryKey.Columns.Count - 1)
textWriter.WriteLine(",");
}
textWriter.WriteLine(")");
}
else
{
textWriter.WriteLine();
}
textWriter.Indent--;
textWriter.Write(")");
}
#endregion
}
}
我认为我们可以使用Android的相同概念为SQLite制作一个简单的迁移引擎。这篇文章展示了这个概念。当然，我们没有任何工作的MigrationSqlGenerator，但这个概念是可靠和有用的。
我不知道有什么SQLite，但是如果你想创建一个别人建议的，你可以从这个开源项目开始。或者你可能会发现这本身就足够了?
http://www.codeproject.com/Articles/32977/Upgrade-framework-for-SQLite-databases