Add new exercise UserProfileDbInitializer.java

Author: tboychuk

pom.xml

@@ -15,6 +15,7 @@
         <module>product-dao</module>
         <module>account-db-initializer</module>
         <module>wall-street-db-initializer</module>
+        <module>user-profile-db-initializer</module>
     </modules>
 
     <properties>

user-profile-db-initializer/README.MD

@@ -0,0 +1,27 @@
+# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>User profiles db initializer exercise :muscle:
+Improve your database design and SQL skills
+### Task
+`UserProfilesDbInitializer` provides an API that allows to create(initialize) a database tables to store user information,
+their work profiles and its relations. Each user can have one and only one profile. A profile is optional and is related 
+ to a single user. The job of initializer is to crate proper database tables.
+ 
+`UserProfilesDbInitializer` contains a *javadoc* that specifies database requirements. **It already contains all required Java 
+implementation.** Your job is to  **implement SQL file** `table_initialization.sql`.
+
+The purpose of the task is to **design a database table following docs and naming convention and implement it using SQL**
+It helps you to **learn the 1 to 1 relations**, and how to design it it the database in **the most efficient way.**
+
+To verify your implementation, run `UserProfilesDbInitializerTest.java`
+
+### Pre-conditions :heavy_exclamation_mark:
+You're supposed to be familiar with database design and naming convention, *JDBC API* and *SQL*
+
+### How to start :question:
+* Just clone the repository and start implementing the **todo** section, verify your changes by running tests
+* If you don't have enough knowledge about this domain, check out the [links below](#related-materials-information_source)
+* Don't worry if you got stuck, checkout the **exercise/completed** branch and see the final implementation
+ 
+### Related materials :information_source:
+ * [JDBC API basics tutorial](https://github.com/bobocode-projects/jdbc-api-tutorial/tree/master/jdbc-basics) <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=20/>
+ 
+

user-profile-db-initializer/pom.xml

@@ -0,0 +1,22 @@
+<?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>jdbc-api-exercises</artifactId>
+        <groupId>com.bobocode</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>user-profile-db-initializer</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.bobocode</groupId>
+            <artifactId>jdbc-util</artifactId>
+            <version>1.0-SNAPSHOT</version>
+        </dependency>
+    </dependencies>
+
+</project>

user-profile-db-initializer/src/main/java/com/bobocode/UserProfileDbInitializer.java

@@ -0,0 +1,36 @@
+package com.bobocode;
+
+import com.bobocode.util.FileReader;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+/**
+ * {@link UserProfileDbInitializer} is an API that has only one method. It allow to create a database tables to store
+ * information about users and their profiles.
+ */
+public class UserProfileDbInitializer {
+    private final static String TABLE_INITIALIZATION_SQL_FILE = "db/migration/table_initialization.sql"; // todo: see the file
+    private DataSource dataSource;
+
+    public UserProfileDbInitializer(DataSource dataSource) {
+        this.dataSource = dataSource;
+    }
+
+    /**
+     * Reads the SQL script form the file and executes it
+     *
+     * @throws SQLException
+     */
+    public void init() throws SQLException {
+        String createTablesSql = FileReader.readWholeFileFromResources(TABLE_INITIALIZATION_SQL_FILE);
+
+        try (Connection connection = dataSource.getConnection()) {
+            Statement statement = connection.createStatement();
+            statement.execute(createTablesSql);
+        }
+    }
+
+}

user-profile-db-initializer/src/main/resources/db/migration/table_initialization.sql

@@ -0,0 +1,25 @@
+/*
+
+User profile database stores information about users and their work profiles.
+
+Each user has one and only one work profile.
+
+Each user has stored first and last names, email and birthday which are mandatory. Email is a unique value.
+A profile for each user is optional, and consists of optional information: city, job_position, company and education.
+All these fields are regular strings without restrictions.
+
+  TECH NOTES AND NAMING CONVENTION
+- All tables, columns and constraints are named using "snake case" naming convention
+- All table names must be plural (e.g. "companies", not "company")
+- All tables (except link tables) should have a single-value identifier of type BIGINT, which is a primary key
+- All primary key, foreign key, and unique constraint should be named according to the naming convention.
+- All "1 - optional 1" relations should be handled using the same primary key value for both tables. E.g. child table
+should have a column that stores primary key from a parent table, which is a foreign key and primary key at the same time
+
+- All primary keys should be named according to the following rule "table_name_PK"
+- All foreign keys should be named according to the following rule "table_name_reference_table_name_FK"
+- All alternative keys (unique) should be named according to the following rule "table_name_column_name_AK"
+
+*/
+
+-- TODO: implement the SQL according to the description