转：SubSonic基本操作
SubSonic2.1版本 – 例出3种查询。
Product product = new Select().From<Product>()
.Where(Product.ProductIDColumn).IsEqualTo(4)
.ExecuteSingle<Product>();
Product product = DB.Select().From<Product>()
.Where("ProductID").IsEqualTo(4)
.ExecuteSingle<Product>();
Query query = new Query(Product.Schema);
query.WHERE("ProductID=4").ORDER_BY("ProductID asc");
IDataReader dr = Product.FetchByQuery(query);
DataSet product = new Query(Product.Schema).WHERE("ProductID=4").
ORDER_BY("Prod uctID asc").ExecuteDataSet();
关联查询
DataSet product = new Select( Product.ProductNameColumn, Category.CategoryNameColumn ).From<Product>() .InnerJoin(Category.CategoryIDColumn, Product.CategoryIDColumn) .Where(Category.CategoryIDColumn).IsGreaterThan(4) .ExecuteDataSet();
注意. InnerJoin(f2, f1) 的使用方法。分页查询
List<Product> products = new Select().From<Product>()
.Where(Product.ProductIDColumn).IsEqualTo(4)
.Paged(1, 30)
.ExecuteTypedList<Product>();
查询—返回对象
ExecuteReader(); 返回DataReader ExecuteScalar(); 返回对象 ExecuteScalar<string>(); 返回泛型对象 ExecuteSingle<Product>(); 返回表实体对象 ExecuteTypedList<Product>(); 返回泛型表实休数据集 ExecuteDataSet(); 返回DataSet ExecuteJoinedDataSet<强数型数据集>(); 返回关联查询 DataSet Execute(); 返回执行后，数据更新条数
SQL关键词
IsEqualTo(obj) // 等于 value IsBetweenAnd(obj1, obj2) // [字段1] BETWEEN 值1 AND 值2 StartsWith // LIEK '1%‘ EndsWith // LIEK '%1‘ IsGreaterThan // [字段1] > 值1 IsGreaterThanOrEqualToIsGreaterThan // [字段1] >= 值1 IsLessThan // [字段1] < 值1 IsLessThanOrEqualToIsLessThan // [字段1] <= 值1 WhereExpression / AndExpression // Expression 表示括号
C#：
.Where("1").IsGreaterThan(1)
.And("2").IsGreaterThanOrEqualTo(2)
.AndExpression("3").IsLessThan(3)
.AndExpression("4").IsLessThanOrEqualTo(4).And("5").StartsWith("5")
.AndExpression("6").EndsWith("6")
.ExecuteSingle<Product>();
//SQL：WHERE 1 > @1AND 2 >= @2 AND (3 < @3) AND (4 <= @4 AND 5 LIKE @5) AND (6 LIKE @6) 修改
Product product = new Product(4);
product.ProductName = "amo";
product.Save();
int i = new Update(Product.Schema)
.Set(Product.ProductNameColumn).EqualTo("Chai -- Amo")
.Where(Product.ProductIdColumn).IsEqualTo(1)
.Execute();
添加
Product product = new Product();
product.ProductName = "my xiaoli";
product.SupplierID = 1;
product.CategoryID = 1;
product.Discontinued = true;
//............
product.Save();
int i = new Insert().Into(Product.Schema,
"ProductName",
"SupplierID",
"CategoryID",
"Discontinued“
)
.Values("my amo", 1, 1, 1).Execute();
删除
int i = new Delete ().From<Product>() .Where(Product.ProductIDColumn). IsEqualTo(1) .Execute();
事务1
List<Insert> queries = new List<Insert>();
queries.Add(new Insert().Into(Product.Schema).Values("product1"));
queries.Add(new Insert().Into(Product.Schema).Values("product2"));
queries.Add(new Insert().Into(Product.Schema).Values("product3"));
queries.Add(new Insert().Into(Product.Schema).Values("product4"));
queries.Add(new Insert().Into(Product.Schema).Values("product5"));
queries.Add(new Insert().Into(Product.Schema).Values("product6"));
queries.Add(new Insert().Into(Product.Schema).Values("product7"));
//execute in a transaction
SqlQuery.ExecuteTransaction(queries);
事务2
using (SharedDbConnectionScope sp = new SharedDbConnectionScope())
{
using (TransactionScope scope = new TransactionScope())
{
// coding....
scope.Complete();
}
}
减少对ActiveRecord的依赖
MyProduct product = new Select(
Product.ProductNameColumn,
Category.CategoryNameColumn
).From<Product>()
.InnerJoin(Category.CategoryIDColumn, Product.CategoryIDColumn)
.Where(Category.CategoryIDColumn).IsGreaterThan(4)
.ExecuteSingle<MyProduct>();
string cname = product.CategoryName;
string pname = product.ProductName;
自定义MyProduct实体类
public class MyProduct : ActiveRecord<MyProduct> {
public string CategoryName {
get { return GetColumnValue<string>(Category.Columns.CategoryName); }
set { SetColumnValue(Category.Columns.CategoryName, value); }
}
public string ProductName {
get { return GetColumnValue<string>(Product.Columns.ProductName); }
set { SetColumnValue(Product.Columns.ProductName, value); }
}
}