101companies

Headline

Database programming with JDBC and H2-Database containing one or more companies

Characteristics

We use JDBC/SQL for data processing. That is, we use embedded SQL in Java.

Relationships

For a MySQL version see Contribution:mySqlMany.

For a version using SQL "SUM" in Total see Contribution:h2jdbcManySum.

For a version with a database for exactly one company see Contribution:h2jdbcOne.

Illustration

This contribution is using a simple "SELECT" statement returning a set of salaries in Total: 

SELECT salary FROM employee
Therefore we need a loop for adding the single salaries 

while (salaries.next())
    total += salaries.getDouble("salary");

Architecture

Overview of the Java classes:

  • Total: Using SQL "SELECT" statement to get all salaries, then iterating over the ResultSet.
  • Cut: Using SQL "UPDATE" statement to cut all salaries.
  • Depth: Using SQL "SELECT" statement to get maximum depth of all departments.

Usage

This contribution uses Technology:Gradle for building. Technology:Eclipse is supported.

See https://github.com/101companies/101simplejava/blob/master/README.md

(C) 2012-2024 softlang.org and contributors

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