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https://github.com/mhewedy/spwrap

Simple Stored Procedure call wrapper with no framework dependencies.
https://github.com/mhewedy/spwrap

dao-interface database jdbc spwrap sql stored-procedures

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Simple Stored Procedure call wrapper with no framework dependencies.

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# spwrap

Stored Procedure caller; simply execute stored procedure from java code.    

*Compatible with `jdk` >= `1.5`, with only single dependency (`slf4j-api`)*



[![Build Status](https://travis-ci.org/mhewedy/spwrap.svg?branch=master)](https://travis-ci.org/mhewedy/spwrap)

[![Coverage Status](https://codecov.io/github/mhewedy/spwrap/coverage.svg?branch=master)](https://codecov.io/github/mhewedy/spwrap?branch=master)



## Step 0: Create Stored Procedures:



Suppose you have 3 Stored Procedures to save customer to database, get customer by id and list all customer.



For example here's SP code using HSQL:

```sql

CREATE PROCEDURE create_customer(firstname VARCHAR(50), lastname VARCHAR(50), OUT custId INT, 

        OUT code SMALLINT, OUT msg VARCHAR(50))

    MODIFIES SQL DATA DYNAMIC RESULT SETS 1

    BEGIN ATOMIC

        INSERT INTO CUSTOMERS VALUES (DEFAULT, firstname, lastname);

        SET custId = IDENTITY();

        SET code = 0 -- success;

    END



CREATE PROCEDURE get_customer(IN custId INT, OUT firstname VARCHAR(50), OUT lastname VARCHAR(50), 

        OUT code SMALLINT, OUT msg VARCHAR(50)) 

    READS SQL DATA

    BEGIN ATOMIC

        SELECT first_name, last_name INTO firstname, lastname FROM customers WHERE id = custId;

        SET code = 0 -- success;

    END



CREATE PROCEDURE list_customers(OUT code SMALLINT, OUT msg VARCHAR(50))

    READS SQL DATA DYNAMIC RESULT SETS 1

    BEGIN ATOMIC

        DECLARE result CURSOR FOR SELECT id, first_name firstname, last_name lastname FROM CUSTOMERS;

        OPEN result;

        SET code = 0 -- success;

    END

```

>**NOTE**: Every Stored Procedure by default need to have 2 additional Output Parameters at the end of its parameter list. One of type `SMALLINT` and the other of type `VARCHAR` for result code and message respectively, where result code `0` means success. You can override the `0` value or remove this default behviour at all, [see the configuration wiki page](https://github.com/mhewedy/spwrap/wiki/Configurations).



## Step 1: Create The DAO interface:

```java

public interface CustomerDAO {



    @StoredProc("create_customer")

    void createCustomer(@Param(VARCHAR) String firstName, @Param(VARCHAR) String lastName);



    @StoredProc("get_customer")

    Customer getCustomer(@Param(INTEGER) Integer id);	

	

    @StoredProc("list_customers")

    List listCustomers();

}

```



## Step 2: Map Output parameters and Result set (if any):



Before start using the `CustomerDAO` interface, one last step is required, to *map* the result of the `get_customer` and `list_customers` stored procedures.



* `get_customer` stored procs returns the result as Output Parameters, so you need to have a class to implement `TypedOutputParamMapper` interface.

* `list_customers` stored proc returns the result as Result Set, so you need to have a class to implement `ResultSetMapper` interface.



Let's create Customer class to implement both interfaces (for `getCustomer` and `listCustomers`):



```java

public class Customer implements TypedOutputParamMapper, ResultSetMapper {



	private Integer id;

	private String firstName, lastName;



	public Customer() {

	}



	public Customer(Integer id, String firstName, String lastName) {

		super();

		this.id = id;

		this.firstName = firstName;

		this.lastName = lastName;

	}



	public Integer id() {

		return id;

	}



	public String firstName() {

		return firstName;

	}



	public String lastName() {

		return lastName;

	}

	

	 //You can acess result set columns/output parameters by name as well

	@Override

	public Customer map(Result> result) {

		if (result.isResultSet()) {

			return new Customer(result.getInt(1), result.getString(2), result.getString(3));

		} else {

			return new Customer(null, result.getString(1), result.getString(2));

		}

	}



	// for TypedOutputParamMapper

	@Override

	public List getTypes() {

		return Arrays.asList(VARCHAR, VARCHAR);

	}

}

```

See more examples on [spwrap-examples](https://github.com/mhewedy/spwrap-examples) github project and read more about [Mappers](https://github.com/mhewedy/spwrap/wiki/Mappers) in the wiki.



>**NOTE**: If your stored procedure returns a single **output parameter** with no result set, then you can use the `@Scalar` annotation and you will not need to provide a Mapper class yourself, the mapping will done for you. [see wiki page about scalars for more](https://github.com/mhewedy/spwrap/wiki/Scalar)



>**NOTE**: You can use [`@AutoMapper`s](https://github.com/mhewedy/spwrap/wiki/AutoMappers) to do the mapping for you instead of Mapping the Result object into your domain object yourself.



## Step 3: Using the DAO interface:



Now you can start using the interface to call the stored procedures:

```java

DataSource dataSource = ...

DAO dao = new DAO.Builder(dataSource).build();

CustomerDAO customerDao = dao.create(CustomerDAO.class);



customerDao.createCustomer("Abdullah", "Muhammad");

Customer customer = customerDao.getCustomer1(1);

Assert.assertEquals("Abdullah", customer.firstName());

```

## Installation

Gradle:

```gradle

compile group: 'com.github.mhewedy', name: 'spwrap', version: '0.0.20'

```

Maven:

```xml



    com.github.mhewedy

    spwrap

    0.0.20



```

## Additional staff:



* If you don't supply the stored procedure name to `@StoredProc`, it will use the method name by default.



* `@Param` annotation should used for *ALL* method parameters and accepts the SQL Type per `java.sql.Types`.



* If you don't want to tie your Domain Object with `spwrap` as of step 3 above, you can have another class to implement the Mapper interfaces (`TypedOutputParamMapper` and `ResultSetMapper`) and pass it to the annotaion `@Mapper` like:

```java

@Mapper(CustomResultSetMapper.class)

@StoredProc("list_customers")

List listCustomers();

```

* `@Mapper` annotation overrides the mapping specified by the return type object, i.e. `spwrap` extract Mapping infromation from the return type class, and then override it with the classes set by `@Mapper` annotation if found.



* Your Stored procedure can return output parameter as well as *One* Result set in one call, to achieve this use `Tuple` return type:

```java

@Mapper({MyResultSetMapper.class, MyOutputParameterMapper.class})

@StoredProc("list_customers_with_date")

Tuple listCustomersWithDate();

```

## Limitations:

* spwrap doesn't support INOUT parameters.



* spwrap doesn't support returning multi-result sets from the stored procedure.



* When the Stored procedure have input and output parameters, input parameters should come first and then the output parameters.



## Database Support:

Because `spwrap` is based on JDBC API, theoretically it should support any Database Management System with a JDBC Driver, *However* it is [tested](https://travis-ci.org/mhewedy/spwrap) on **HSQL**, **MySQL**, **SQL Server** and **Oracle** with jdk **1.6**~~, **1.7** and **1.8**~~ (1.7 and 1.8 are remove to reduce build time). (Plan to test againest: `Postgresql`, `Sybase`, `DB2`)



See [wiki page](https://github.com/mhewedy/spwrap/wiki) for more info and test cases/[spwrap-examples](https://github.com/mhewedy/spwrap-examples) for more usage scenarios.