ServiceStack.OrmLite 学习笔记3 建表

创建表

前一篇忘记写创建表了，这里补上。（其实前一篇也有那么一点）

建议安装源码里的t4模板看看效果先。

public 的属性才有效

在表被创建或者删除的时候执行sql语句

[PostCreateTable("INSERT INTO TableWithSeedData (Name) VALUES ('Foo');" +

"INSERT INTO TableWithSeedData (Name) VALUES ('Bar');")]

public class TableWithSeedData

{

[AutoIncrement]

public int Id { get; set; }

public string Name { get; set; }

}

或

typeof(TableWithSeedData)

.AddAttributes(new PostCreateTableAttribute(

"INSERT INTO TableWithSeedData (Name) VALUES ('Foo');" +

"INSERT INTO TableWithSeedData (Name) VALUES ('Bar');"));

前戏和事后，都是可以有自己的玩法

[PreCreateTable(runSqlBeforeTableCreated)][PostCreateTable(runSqlAfterTableCreated)]

[PreDropTable(runSqlBeforeTableDropped)][PostDropTable(runSqlAfterTableDropped)]

public class Table {}

public class PocoTable

{

public int Id { get; set; }

[CustomField("CHAR(20)")] //这里是数据库的类型的字段的验证，和fluentvalidation 不太一样，fluentvalidation更多是对类的字段验证。 这里的 [CustomField("CHAR(20)")]是和ef差不多，是指和数据库的映射
public string CharColumn { get; set; }

[CustomField("DECIMAL(18,4)")]
public decimal? DecimalColumn { get; set; }

}

db.CreateTable();

生成sql：

CREATE TABLE "PocoTable"

(

"Id" INTEGER PRIMARY KEY,

"CharColumn" CHAR(20) NULL,

"DecimalColumn" DECIMAL(18,4) NULL

);

//外键和引用 建议自己建几个表，亲手撸一下。av看再多，不如约个来一发

public class TableWithAllCascadeOptions

{

[AutoIncrement] public int Id { get; set; }

[References(typeof(ForeignKeyTable1))]
public int SimpleForeignKey { get; set; }

[ForeignKey(typeof(ForeignKeyTable2), OnDelete = "CASCADE", OnUpdate = "CASCADE")]
public int? CascadeOnUpdateOrDelete { get; set; }

[ForeignKey(typeof(ForeignKeyTable3), OnDelete = "NO ACTION")]
public int? NoActionOnCascade { get; set; }

[Default(typeof(int), "17")]  //默认值
[ForeignKey(typeof(ForeignKeyTable4), OnDelete = "SET DEFAULT")]
public int SetToDefaultValueOnDelete { get; set; }

[ForeignKey(typeof(ForeignKeyTable5), OnDelete = "SET NULL")]
public int? SetToNullOnDelete { get; set; }

}

db.DropAndCreateTable();//删除然后添加表

dbFactory.Run(db => db.CreateTable(overwrite:false));//不解释 看姿势

db.CreateTable(true);// overwrite 直给

//批量添加 用事务

db.DropAndCreateTable();

var rows = "A,B,B,C,C,C,D,D,E".Split(',').Map(x => new LetterFrequency { Letter = x });

db.InsertAll(rows);

实现在这里

internal static void InsertAll(this IDbCommand dbCmd, IEnumerable objs)

{

IDbTransaction dbTrans = null;

        try
        {
            if (dbCmd.Transaction == null)
                dbCmd.Transaction = dbTrans = dbCmd.Connection.BeginTransaction();

            var dialectProvider = dbCmd.GetDialectProvider();

            dialectProvider.PrepareParameterizedInsertStatement<T>(dbCmd);

            foreach (var obj in objs)
            {
                if (OrmLiteConfig.InsertFilter != null)
                    OrmLiteConfig.InsertFilter(dbCmd, obj);

                dialectProvider.SetParameterValues<T>(dbCmd, obj);

                try
                {
                    dbCmd.ExecNonQuery();
                }
                catch (Exception ex)
                {
                    Log.Error("SQL ERROR: {0}".Fmt(dbCmd.GetLastSqlAndParams()), ex);
                    throw;
                }
            }

            if (dbTrans != null)
                dbTrans.Commit();
        }
        finally
        {
            if (dbTrans != null)
                dbTrans.Dispose();
        }
    }