EF Mapping for Variable Name Tables

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EF Mapping for Variable Name Tables

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#1 by (1 votes)

1

I have several tables with the same structure, but with different names.

Eg:

CREATE TABLE 'log_historico_25072016' (
'lhis_id' INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
'lhis_cvei_id' INT(10) UNSIGNED NOT NULL,
'lhis_sequencia' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_tapl_id' TINYINT(3) UNSIGNED NOT NULL,
'lhis_cevt_id' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_data_gps' TIMESTAMP NOT NULL DEFAULT '0000-00-00 00:00:00',
'lhis_data_ins' TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
'lhis_latitude' FLOAT NOT NULL,
'lhis_longitude' FLOAT NOT NULL,
'lhis_cpnt_id' INT(10) UNSIGNED NOT NULL,
'lhis_ignicao' CHAR(1) NOT NULL,
'lhis_velocidade' TINYINT(3) UNSIGNED NOT NULL,
'lhis_nsat' TINYINT(3) UNSIGNED NOT NULL,
'lhis_curso' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_info' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_dop' TINYINT(3) UNSIGNED NOT NULL,
'lhis_input' BIGINT(20) NOT NULL,
'lhis_output' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_tmco_id' TINYINT(3) UNSIGNED NOT NULL,
'lhis_inAlarme' CHAR(1) NOT NULL,
'lhis_chip' TINYINT(3) UNSIGNED NOT NULL,
'lhis_crua_id' INT(10) UNSIGNED NOT NULL DEFAULT '0',
'lhis_ext_id' INT(10) UNSIGNED NULL DEFAULT NULL,
'lhis_altitude' TINYINT(4) NOT NULL DEFAULT '0',
'lhis_consumo' TINYINT(3) UNSIGNED NOT NULL DEFAULT '0',
'lhis_ltemp_1' TINYINT(3) UNSIGNED NULL DEFAULT NULL,
'lhis_ltemp_2' TINYINT(3) UNSIGNED NULL DEFAULT NULL,
'lhis_ltemp_3' TINYINT(3) UNSIGNED NULL DEFAULT NULL,
'lhis_ltemp_4' TINYINT(3) UNSIGNED NULL DEFAULT NULL,
PRIMARY KEY ('lhis_id'),
UNIQUE INDEX 'lhis_cvei_gps_seq_apl_evt_un_27052016' ('lhis_cvei_id', 'lhis_data_gps', 'lhis_sequencia', 'lhis_tapl_id', 'lhis_cevt_id'),
INDEX 'lhis_data_gps_ix' ('lhis_data_gps'),
INDEX 'lhis_data_ins_ix' ('lhis_data_ins')


CREATE TABLE 'log_historico_26072016' (
'lhis_id' INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
'lhis_cvei_id' INT(10) UNSIGNED NOT NULL,
'lhis_sequencia' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_tapl_id' TINYINT(3) UNSIGNED NOT NULL,
'lhis_cevt_id' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_data_gps' TIMESTAMP NOT NULL DEFAULT '0000-00-00 00:00:00',
'lhis_data_ins' TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
'lhis_latitude' FLOAT NOT NULL,
'lhis_longitude' FLOAT NOT NULL,
'lhis_cpnt_id' INT(10) UNSIGNED NOT NULL,
'lhis_ignicao' CHAR(1) NOT NULL,
'lhis_velocidade' TINYINT(3) UNSIGNED NOT NULL,
'lhis_nsat' TINYINT(3) UNSIGNED NOT NULL,
'lhis_curso' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_info' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_dop' TINYINT(3) UNSIGNED NOT NULL,
'lhis_input' BIGINT(20) NOT NULL,
'lhis_output' SMALLINT(5) UNSIGNED NOT NULL,
'lhis_tmco_id' TINYINT(3) UNSIGNED NOT NULL,
'lhis_inAlarme' CHAR(1) NOT NULL,
'lhis_chip' TINYINT(3) UNSIGNED NOT NULL,
'lhis_crua_id' INT(10) UNSIGNED NOT NULL DEFAULT '0',
'lhis_ext_id' INT(10) UNSIGNED NULL DEFAULT NULL,
'lhis_altitude' TINYINT(4) NOT NULL DEFAULT '0',
'lhis_consumo' TINYINT(3) UNSIGNED NOT NULL DEFAULT '0',
'lhis_ltemp_1' TINYINT(3) UNSIGNED NULL DEFAULT NULL,
'lhis_ltemp_2' TINYINT(3) UNSIGNED NULL DEFAULT NULL,
'lhis_ltemp_3' TINYINT(3) UNSIGNED NULL DEFAULT NULL,
'lhis_ltemp_4' TINYINT(3) UNSIGNED NULL DEFAULT NULL,
PRIMARY KEY ('lhis_id'),
UNIQUE INDEX 'lhis_cvei_gps_seq_apl_evt_un_27052016' ('lhis_cvei_id', 'lhis_data_gps', 'lhis_sequencia', 'lhis_tapl_id', 'lhis_cevt_id'),
INDEX 'lhis_data_gps_ix' ('lhis_data_gps'),
INDEX 'lhis_data_ins_ix' ('lhis_data_ins')

The name of the tables is defined by log_historico_ddmmyyyy

Can you use EF to map these tables?

c# entity-framework

asked by anonymous 26.07.2016 / 02:27

1 answer

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score 1 · Accepted Answer

In summary, yes.

In the event OnModelCreating of its context, define the following:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    ConfigurationRegistrar configurationRegistrar = modelBuilder.Configurations;

    new ConfiguracaoGeralEntidades(configurationRegistrar);
}

This causes us to get the complete configuration of Model Builder within a custom class handling this configuration. Defining this class:

public class ConfiguracaoGeralEntidades
{
    public ConfiguracaoGeralEntidades(ConfigurationRegistrar configurationRegistrar)
    {
        configurationRegistrar.Add(new MinhaConfiguracaoDinamica());
        // Aqui você pode colocar outras configurações, se quiser.
    }
}

Now comes the dynamic part: here you will put the table name as a string and register as a mapping:

public class MinhaConfiguracaoDinamica : EntityTypeConfiguration<LogHistorico>
{
    public MinhaConfiguracaoDinamica()
    {
        ToTable("log_historico_25072016"); // Aqui estou supondo que o mapeamento está todo certo.
        Property(entity => entity.Id).HasColumnName("lhis_id");

        // Coloque as demais configurações aqui.
    }
}

In the Application_Start event of your Global.asax.cs, place the following:

DbContextInitializer.Init(connectionString);

DbContextInitializer is below:

public static class DbContextInitializer
{
    public static void Init (string connectionString)
    {
        Database.SetInitializer(new CreateDbThrowExceptionIfModelDiffersInitializer<SMDbContext>());

        using(var dbContenxt = new MyDbContext(connectionString))
        {
            try
            {
                dbContenxt.Database.Initialize(true);
            }
            catch(DatabaseModelDiffersException diffException)
            {
                // Aqui você trata exceções em caso de o banco estar diferente dos mapeamentos iniciados.
            }
            catch(Exception ex)
            {
                // Aqui você trata outras exceções.
                throw;
            }
        }
    }

    public class CreateDbThrowExceptionIfModelDiffersInitializer<TContext> : IDatabaseInitializer<TContext> where TContext : DbContext
    {
        public void InitializeDatabase(TContext context)
        {
            using (new TransactionScope(TransactionScopeOption.Suppress))
            {
                if (!context.Database.Exists())
                    context.Database.Create();
            }

            if (!context.Database.CompatibleWithModel(true))
            {
                throw new DatabaseModelDiffersException("Modelo do banco diferente dos mapeamentos dos Models.");
            }
        }

        protected virtual void Seed(TContext context)
        {
            // Aqui você faz algum seeding, se quiser.
        }
    }

    // Exceção personalizada, para tratar as diferenças de banco e seus Models.
    public class DatabaseModelDiffersException : Exception
    {
        public DatabaseModelDiffersException(string msg) : base(msg)
        {}
    }
}

I pulled it out .