sql-generation | 易学教程

How can I generate the SQL query using SQL::Abstract?

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问题 How do I generate the WHERE clause for this query using SQL::Abstract: SELECT COUNT(*) FROM table WHERE id = 111 AND NOT FIND_IN_SET(type, '1,2,3,4') AND status = 'pending'; What's the proper way to include conditions like WHERE FIND_IN_SET(type, '1,2,3,4') ? 回答1: See the not_bool unary operator option: use SQL::Abstract; my $sql = SQL::Abstract->new; my $where = { id => 111, status => 'pending', -not_bool => "FIND_IN_SET(type, '1,2,3,4')", }; my ($query, @bind) = $sql->select( 'table',

EF Code First adds extra column to query that doesn't exist in model anymore

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问题 This is my first question on SO. I have an ASP.NET 4.0 MVC3 project that is using EF Code First as ORM and FluentMigrator for version migrations. And there I have Message entity class that looks like this: public class Message { [Key] [Column("Message_Id")] public int Id { get; set; } public DateTime CreatedTime { get; set; } [Required] [StringLength(MaxSubjectLength)] public string Subject { get; set; } [Required] [StringLength(MaxBodyLength)] public string Body { get; set; } public Link

EF Code First adds extra column to query that doesn't exist in model anymore

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This is my first question on SO. I have an ASP.NET 4.0 MVC3 project that is using EF Code First as ORM and FluentMigrator for version migrations. And there I have Message entity class that looks like this: public class Message { [Key] [Column("Message_Id")] public int Id { get; set; } public DateTime CreatedTime { get; set; } [Required] [StringLength(MaxSubjectLength)] public string Subject { get; set; } [Required] [StringLength(MaxBodyLength)] public string Body { get; set; } public Link Link { get;set; } } with no custom mappings defined, and MSSQL Server 2012 database table Messages: CREATE

Entity Framework 6: How to override SQL generator?

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I'd like to amend the SQL that's being generated by EF:CF when generating the database schema (DDL), as suggested by the Entity Framework team . How can this be done? I couldn't find anything appropriate via Google. You can override the MigrationSqlGenerator that is used by Entity Framework by calling the DbMigrationsConfiguration.SetSqlGenerator() method in the constructor of your DbMigrationsConfiguration class, passing the database provider name (e.g. "System.Data.SqlClient" for SQL Server), and the MigrationSqlGenerator instance to use for that database provider. Consider the example from

Entity Framework 6: How to override SQL generator?

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问题 I'd like to amend the SQL that's being generated by EF:CF when generating the database schema (DDL), as suggested by the Entity Framework team. How can this be done? I couldn't find anything appropriate via Google. 回答1: You can override the MigrationSqlGenerator that is used by Entity Framework by calling the DbMigrationsConfiguration.SetSqlGenerator() method in the constructor of your DbMigrationsConfiguration class, passing the database provider name (e.g. "System.Data.SqlClient" for SQL