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BAEL-5743 Add test for executeQuery method usage #18187

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Jan 28, 2025
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BAEL-5743 Add test for executeQuery method usage #18187

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114 changes: 114 additions & 0 deletions ...4/src/test/java/com/baeldung/exceptionexecutequery/ExceptionWithExecuteQueryLiveTest.java
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package com.baeldung.exceptionexecutequery;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

public class ExceptionWithExecuteQueryLiveTest {

private static final String USERNAME = "johndoe";
private static final String EMAIl = "johndoe@example.com";

private static Connection connection;

@BeforeAll
public static void init() throws SQLException {
connection = DriverManager.getConnection("jdbc:mysql://localhost/sample_db?" + "user=root&password=13042014");

connection.createStatement()
.execute("""
CREATE TABLE IF NOT EXISTS users (
id INT PRIMARY KEY AUTO_INCREMENT,
username VARCHAR(50),
email VARCHAR(50)
)
""");
}

@AfterAll
public static void shutdown() throws SQLException {
connection.createStatement()
.execute("DROP TABLE users");
connection.close();
}

@Test
void givenInsertSql_whenExecuteUpdate_thenAssertUserSaved() throws SQLException {
String insertSql = "INSERT INTO users (username, email) VALUES (?, ?)";
PreparedStatement insertStatement = connection.prepareStatement(insertSql);
insertStatement.setString(1, USERNAME);
insertStatement.setString(2, EMAIl);
insertStatement.executeUpdate();

String selectSql = "SELECT * FROM users WHERE username = ?";
PreparedStatement selectStatement = connection.prepareStatement(selectSql);
selectStatement.setString(1, USERNAME);
ResultSet resultSet = selectStatement.executeQuery();

resultSet.next();
assertEquals(USERNAME, resultSet.getString("username"));
assertEquals(EMAIl, resultSet.getString("email"));
}

@Test
void givenInsertSql_whenExecuteQuery_thenAssertSqlExceptionThrown() throws SQLException {
String insertSql = "INSERT INTO users (username, email) VALUES (?, ?)";
PreparedStatement insertStatement = connection.prepareStatement(insertSql);
insertStatement.setString(1, USERNAME);
insertStatement.setString(2, EMAIl);

SQLException exception = assertThrows(SQLException.class, insertStatement::executeQuery);
assertEquals("Statement.executeQuery() cannot issue statements that do not produce result sets.", exception.getMessage());
}

@Test
void givenUpdateSql_whenExecuteUpdate_thenAssertUserSaved() throws SQLException {
String insertSql = "INSERT INTO users (username, email) VALUES (?, ?)";
PreparedStatement insertStatement = connection.prepareStatement(insertSql);
insertStatement.setString(1, USERNAME);
insertStatement.setString(2, EMAIl);
insertStatement.executeUpdate();

String newEmail = "johndoe@baeldung.com";
String updateSql = "UPDATE users SET email = ? WHERE username = ?";
PreparedStatement updateStatement = connection.prepareStatement(updateSql);
updateStatement.setString(1, newEmail);
updateStatement.setString(2, USERNAME);
updateStatement.executeUpdate();

String selectSql = "SELECT * FROM users WHERE username = ?";
PreparedStatement selectStatement = connection.prepareStatement(selectSql);
selectStatement.setString(1, USERNAME);
ResultSet resultSet = selectStatement.executeQuery();

resultSet.next();
assertEquals(USERNAME, resultSet.getString("username"));
assertEquals(newEmail, resultSet.getString("email"));
}

@Test
void givenUpdateSql_whenExecuteQuery_thenAssertSqlExceptionThrown() throws SQLException {
String insertSql = "INSERT INTO users (username, email) VALUES (?, ?)";
PreparedStatement insertStatement = connection.prepareStatement(insertSql);
insertStatement.setString(1, USERNAME);
insertStatement.setString(2, EMAIl);
insertStatement.executeUpdate();

String newEmail = "johndoe@baeldung.com";
String updateSql = "UPDATE users SET email = ? WHERE username = ?";
PreparedStatement updateStatement = connection.prepareStatement(updateSql);
updateStatement.setString(1, newEmail);
updateStatement.setString(2, USERNAME);
assertThrows(SQLException.class, updateStatement::executeQuery);
}

}