ServiceStack.OrmLite 笔记8 -还是有用的姿势

复杂点的使用2

InsertAll, UpdateAll and DeleteAll 的参数要是IEnumerables

Each关键字返回 IEnumerable 并且是延迟加载的

全局设置当字符串为null时候，设置一个默认值

OrmLiteConfig.OnDbNullFilter = fieldDef = >

fieldDef.FieldType == typeof(string) ? "NULL" : null;

执行sql的时候过滤

public class MockStoredProcExecFilter : OrmLiteExecFilter

{

public override T Exec(IDbConnection dbConn, Func<IDbCommand, T> filter)

{

try

{

return base.Exec(dbConn, filter);

}

catch (Exception ex)

{

if (dbConn.GetLastSql() == "exec sp_name @firstName, @age")

return (T)(object)new Person { FirstName = "Mocked" };

throw;

}

}

}

OrmLiteConfig.ExecFilter = new MockStoredProcExecFilter();

using (var db = OpenDbConnection())

{

var person = db.SqlScalar("exec sp_name @firstName, @age",

new { firstName = "aName", age = 1 });

person.FirstName.Print(); //Mocked

}

CaptureSqlFilter

跟踪可以在调试窗口看到了

using (var captured = new CaptureSqlFilter())

using (var db = OpenDbConnection())

{

db.Where(new { Age = 27 });

captured.SqlStatements[0].PrintDump();

}

同上重复执行

public class ReplayOrmLiteExecFilter : OrmLiteExecFilter

{

public int ReplayTimes { get; set; }

public override T Exec<T>(IDbConnection dbConn, Func<IDbCommand, T> filter)

{

    var holdProvider = OrmLiteConfig.DialectProvider;

    var dbCmd = CreateCommand(dbConn);

    try

    {

        var ret = default(T);

        for (var i = 0; i < ReplayTimes; i++)

        {

            ret = filter(dbCmd);

        }

        return ret;

    }

    finally

    {

        DisposeCommand(dbCmd);

        OrmLiteConfig.DialectProvider = holdProvider;

    }

}

}

OrmLiteConfig.ExecFilter = new ReplayOrmLiteExecFilter { ReplayTimes = 3 };

using (var db = OpenDbConnection())

{

db.DropAndCreateTable();

db.Insert(new PocoTable { Name = "Multiplicity" });

var rowsInserted = db.Count<PocoTable>(q => q.Name == "Multiplicity"); //3

}

单元测试模拟返回的数据

下面返回的数据都是假的，山寨的

using (new OrmLiteResultsFilter {

PrintSql = true,

SingleResult = new Person {

Id = 1, FirstName = "Mocked", LastName = "Person", Age = 100

},

})

{

db.Single(x => x.Age == 42).FirstName // Mocked

db.Single(db.From().Where(x => x.Age == 42)).FirstName // Mocked

db.Single(new { Age = 42 }).FirstName // Mocked

db.Single("Age = @age", new { age = 42 }).FirstName // Mocked

}

一看就懂字符串过滤还有这玩意居然

OrmLiteConfig.StringFilter = s => s.TrimEnd();

db.Insert(new Poco { Name = "Value with trailing " });

db.Select().First().Name // "Value with trailing"

可插入可拔出的复杂类型序列化

据说ServiceStack's的json序列化效率最高

//ServiceStack's JSON and JSV Format

SqliteDialect.Provider.StringSerializer = new JsvStringSerializer();

PostgreSqlDialect.Provider.StringSerializer = new JsonStringSerializer();

//.NET's XML and JSON DataContract serializers

SqlServerDialect.Provider.StringSerializer = new DataContractSerializer();

MySqlDialect.Provider.StringSerializer = new JsonDataContractSerializer();

//.NET XmlSerializer

OracleDialect.Provider.StringSerializer = new XmlSerializableSerializer();

code first的时候会用到吧

public class PocoTable

{

public int Id { get; set; }

[CustomField("CHAR(20)")]

public string CharColumn { get; set; }

[CustomField("DECIMAL(18,4)")]

public decimal? DecimalColumn { get; set; }

}

db.CreateTable();

结果：CREATE TABLE "PocoTable"

(

"Id" INTEGER PRIMARY KEY,

"CharColumn" CHAR(20) NULL,

"DecimalColumn" DECIMAL(18,4) NULL

);

可以这样调用存储过程的

List results = db.SqlList("EXEC GetAnalyticsForWeek 1");

List results = db.SqlList(

"EXEC GetAnalyticsForWeek @weekNo", new { weekNo = 1 });

List results = db.SqlList("EXEC GetTotalsForWeek 1");

List results = db.SqlList(

"EXEC GetTotalsForWeek @weekNo", new { weekNo = 1 });

int result = db.SqlScalar("SELECT 10");

搞个带参数的存储过程

string spSql = @"DROP PROCEDURE IF EXISTS spSearchLetters;

CREATE PROCEDURE spSearchLetters (IN pLetter varchar(10), OUT pTotal int)

BEGIN

SELECT COUNT(*) FROM LetterFrequency WHERE Letter = pLetter INTO pTotal;

SELECT * FROM LetterFrequency WHERE Letter = pLetter;

END";

db.ExecuteSql(spSql);

using (var cmd = db.SqlProc("spSearchLetters", new { pLetter = "C" }))

{

var pTotal = cmd.AddParam("pTotal", direction: ParameterDirection.Output);

var results = cmd.ConvertToList<LetterFrequency>();

var total = pTotal.Value;

}

换个姿势加参数

IDbDataParameter pTotal = null;

var results = db.SqlList("spSearchLetters", cmd => {

cmd.CommandType = CommandType.StoredProcedure;

cmd.AddParam("pLetter", "C");

pTotal = cmd.AddParam("pTotal", direction: ParameterDirection.Output);

});

var total = pTotal.Value;

设置字段的默认值 g点在这里OrmLiteVariables

public class Poco

{

[Default(OrmLiteVariables.SystemUtc)] //= {SYSTEM_UTC}

public DateTime CreatedTimeUtc { get; set; }

}