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## Select Statements
---JAVA---
// select * from products
List<Product> allProducts = db.from(p).select();
// select * from customers where region='WA'
Customer c = new Customer();
List<Customer> waCustomers = db.from(c). where(c.region).is("WA").select();
public static class ProductPrice {
public String productName;
public String category;
public Double price;
}
// select with generation of new anonymous inner class
List<ProductPrice> productPrices =
db.from(p).
orderBy(p.productId).
select(new ProductPrice() {{
productName = p.productName;
category = p.category;
price = p.unitPrice;
}});
---JAVA---
## Insert Statements
---JAVA---
// single record insertion
db.insert(singleProduct);
// single record insertion with primary key retrieval
Long key = db.insertAndGetKey(singleProduct);
// batch record insertion
db.insertAll(myProducts);
// batch insertion with primary key retrieval
List<Long> myKeys = db.insertAllAndGetKeys(list);
---JAVA---
## Update Statements
---JAVA---
// single record update
db.update(singleProduct);
// batch record updates
db.updateAll(myProducts);
// update query
db.from(p).set(p.productName).to("updated")
.increment(p.unitPrice).by(3.14)
.increment(p.unitsInStock).by(2)
.where(p.productId).is(1).update();
// reusable, parameterized update query
String q = db.from(p).set(p.productName).toParameter().where(p.productId).is(1).toSQL();
db.executeUpdate(q, "Lettuce");
---JAVA---
## Merge Statements
Merge statements currently generate the [H2 merge syntax](http://h2database.com/html/grammar.html#merge).
---JAVA---
Product pChang = db.from(p).where(p.productName).is("Chang").selectFirst();
pChang.unitPrice = 19.5;
pChang.unitsInStock = 16;
db.merge(pChang);
---JAVA---
## Delete Statements
---JAVA---
// single record deletion
db.delete(singleProduct);
// batch record deletion
db.deleteAll(myProducts);
// delete query
db.from(p).where(p.productId).atLeast(10).delete();
---JAVA---
## Inner Join Statements
---JAVA---
final Customer c = new Customer();
final Order o = new Order();
List<Customer> customersWithLargeOrders =
db.from(c).
innerJoin(o).on(c.customerId).is(o.customerId).
where(o.total).greaterThan(new BigDecimal("500.00")).
groupBy(c.customerId).select();
List<CustOrder> orders =
db.from(c).
innerJoin(o).on(c.customerId).is(o.customerId).
where(o.total).lessThan(new BigDecimal("500.00")).
orderBy(1).
select(new CustOrder() {{
customerId = c.customerId;
orderId = o.orderId;
total = o.total;
}});
---JAVA---
## View Statements
---JAVA---
// the view named "ProductView" is created from the "Products" table
@IQView(viewTableName = "Products")
public class ProductView {
@IQColumn
@IQConstraint("this >= 200 AND this < 300")
Long id;
@IQColumn
String name;
}
final ProductView v = new ProductView();
List<ProductView> allProducts = db.from(v).select();
// this version of the view model "ProductView" inherits table metadata
// from the Products class which is annotated with IQTable
@IQView(inheritColumns = true)
public class ProductView extends Products {
// inherited BUT replaced to define the constraint
@IQColumn
@IQConstraint("this >= 200 AND this < 300")
Long id;
// inherited from Products
//@IQColumn
//String name;
}
final ProductView v = new ProductView();
List<ProductView> allProducts = db.from(v).select();
// in this example we are creating a view based on a fluent query
// and using 2 levels of inheritance. IQConstraints are ignored
// when using this approach because we are fluently defining them.
@IQView(inheritColumns = true)
public class ProductViewInherited extends ProductView {
}
final Products p = new Products();
db.from(p).where(p.id).atLeast(200L).and(p.id).lessThan(300L).createView(ProductViewInherited.class);
// now replace the view with a variation
db.from(p).where(p.id).atLeast(250L).and(p.id).lessThan(350L).replaceView(ProductViewInherited.class);
// now drop the view from the database
db.dropView(ProductViewInherited.class);
---JAVA---
## Dynamic Queries
Dynamic queries skip all field type checking and, depending on which approach you use, may skip model class/table name checking too.
---JAVA---
// where fragment with object parameters
List<Product> restock = db.from(p).where("unitsInStock=? and productName like ? order by productId", 0, "Chef%").select();
// parameterized query which can be cached and re-used later
String q = db.from(p).where(p.unitsInStock).isParameter().and(p.productName).likeParameter().orderBy(p.productId).toSQL();
List<Product> allProducts = db.executeQuery(Product.class, q, 0, "Chef%");
// statement with binding to your model class
List<Product> allProducts = db.executeQuery(Product.class, "select * from products");
// statement with object parameters and binding to your model class
List<Product> restock = db.executeQuery(Product.class, "select * from products where unitsInStock=?", 0);
/**
* If you want to process the intermediate ResultSet
* yourself make sure to use the <i>closeSilently()</i> method
* to ensure the parent statement is closed too.
*/
ResultSet rs = db.executeQuery("select * from products");
List<Product> allProducts = db.buildObjects(Product.class, rs);
JdbcUtils.closeSilently(rs, true);
---JAVA---
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