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Active record pattern implementation #206
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de9d111
Implement the active record pattern example
stephen-lazarionok 77b6e73
Add active-recotd module to the main pom.xml
stephen-lazarionok 677d061
Merge branch 'master' into active-record
stephen-lazarionok 0c6a5b0
Fix the tests and rename the class
stephen-lazarionok 7bc202c
Fix padding in pom.xml and change variable name
stephen-lazarionok 9a80bb0
Add the description of active record pattern
stephen-lazarionok 2b71444
Change the variable name
stephen-lazarionok 0045932
Use instance methods without this and fix typo
stephen-lazarionok 534b713
Fix typo
stephen-lazarionok d6c3e74
Fix typo and extract DB logic into a separate class
stephen-lazarionok c085690
Fix some small issues
stephen-lazarionok 10d73a9
Optimize imports and use double instead of Double for length
stephen-lazarionok 9f73cfe
Form try-catch blocks
stephen-lazarionok 6daddf9
Release all the resources in finally block and add the documentation …
stephen-lazarionok cfc63af
Reformat code according to Google style guidelines
stephen-lazarionok c01f49b
Remove the class diagram
stephen-lazarionok db208e9
Revert README.md
stephen-lazarionok ea4bf89
Fix readme
stephen-lazarionok 9129447
Update the version in pom.xml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| --- | ||
| layout: pattern | ||
| title: Active Record | ||
| folder: active-record | ||
| permalink: /patterns/active-record/ | ||
| categories: Architectural | ||
| tags: Java | ||
| --- | ||
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| **Intent:** Active record is an object that wraps a row in a database table or view, | ||
| encapsulates the database access, and adds domain logic on that data. Active Record | ||
| uses the most obvious approach, putting data access logic in the domain object. | ||
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| **Applicability:** Use active record pattern when | ||
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| * objects correspond directly to the database tables | ||
| * business logic is not too complex | ||
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| **Real world examples:** | ||
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| * [ActiveJDBC](https://en.wikipedia.org/wiki/ActiveJDBC) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| <?xml version="1.0" encoding="UTF-8"?> | ||
| <project xmlns="http://maven.apache.org/POM/4.0.0" | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | ||
| <parent> | ||
| <artifactId>java-design-patterns</artifactId> | ||
| <groupId>com.iluwatar</groupId> | ||
| <version>1.6.0</version> | ||
| </parent> | ||
| <modelVersion>4.0.0</modelVersion> | ||
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| <artifactId>active-record</artifactId> | ||
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| <dependencies> | ||
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| <dependency> | ||
| <groupId>com.h2database</groupId> | ||
| <artifactId>h2</artifactId> | ||
| </dependency> | ||
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| <!-- Test dependencies --> | ||
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| <dependency> | ||
| <groupId>junit</groupId> | ||
| <artifactId>junit</artifactId> | ||
| <scope>test</scope> | ||
| </dependency> | ||
|
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| </dependencies> | ||
| </project> |
58 changes: 58 additions & 0 deletions
58
active-record/src/main/java/com/iluwatar/active/record/DB.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| package com.iluwatar.active.record; | ||
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| import org.h2.tools.DeleteDbFiles; | ||
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| import java.sql.*; | ||
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| /** | ||
| * An utility class that holds and encapsulates all the DB related operations. | ||
| * <p/> | ||
| * Created by Stephen Lazarionok. | ||
| */ | ||
| public class DB { | ||
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| static { | ||
| DeleteDbFiles.execute("~", "test", true); | ||
| try { | ||
| Class.forName("org.h2.Driver"); | ||
| final Connection connection = getConnection(); | ||
| final Statement statement = connection.createStatement(); | ||
| statement.execute( | ||
| "create table wand(id BIGINT primary key, length_inches REAL, wood varchar(100), core varchar(100))"); | ||
| statement.close(); | ||
| connection.close(); | ||
| } catch (final SQLException | ClassNotFoundException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| /** | ||
| * Provides a connection to the database configured. | ||
| * | ||
| * @return | ||
| * @throws SQLException | ||
| */ | ||
| public static Connection getConnection() throws SQLException { | ||
| return DriverManager.getConnection("jdbc:h2:~/test"); | ||
| } | ||
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| public static void closeConnection(final Connection connection) { | ||
| try { | ||
| if (connection != null) { | ||
| connection.close(); | ||
| } | ||
| } catch (SQLException e) { | ||
| System.out.println("Failed to close a connection"); | ||
| } | ||
| } | ||
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| public static void closePreparedStatement(final PreparedStatement ps) { | ||
| try { | ||
| if (ps != null) { | ||
| ps.close(); | ||
| } | ||
| } catch (SQLException e) { | ||
| System.out.println("Failed to close a prepared statement"); | ||
| } | ||
| } | ||
| } | ||
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Add javadoc explaining why this class is important. Mainly that it allows making the solution Multi-tenant. Switching DB will not require code change in
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Add the documentation to the DB class