[UPDATE] Final cleanup for database queries and schema create

Author: hossain-khan

build.gradle.kts

@@ -28,6 +28,10 @@ sqldelight {
     }
 }
 
+java {
+    toolchain.languageVersion.set(JavaLanguageVersion.of(19))
+}
+
 dependencies {
     // PostgreSQL is a powerful object-relational database system
     // https://www.postgresql.org/
@@ -43,6 +47,10 @@ dependencies {
     // https://cashapp.github.io/sqldelight/2.0.0/jvm_postgresql
     implementation("app.cash.sqldelight:jdbc-driver:2.0.0")
 
+    // Faker - Generates fake data for testing or populating a development database.
+    // https://github.com/blocoio/faker
+    implementation("io.github.serpro69:kotlin-faker:1.14.0")
+
     testImplementation(kotlin("test"))
 }
 

src/main/kotlin/dev/hossain/postgresqldelight/Main.kt

@@ -2,7 +2,11 @@ package dev.hossain.postgresqldelight
 
 import app.cash.sqldelight.db.SqlDriver
 import app.cash.sqldelight.driver.jdbc.asJdbcDriver
+import io.github.serpro69.kfaker.Faker
+import io.github.serpro69.kfaker.faker
 import javax.sql.DataSource
+import kotlin.math.absoluteValue
+import kotlin.random.Random
 
 
 fun main(args: Array<String>) {
@@ -13,23 +17,36 @@ fun main(args: Array<String>) {
 
 
     val driver: SqlDriver = dataSource.asJdbcDriver()
+    SportsDatabase.Schema.create(driver)
 
-    doDatabaseThings(driver)
+    testDriveDatabase(driver, faker { })
 }
 
 
-
-fun doDatabaseThings(driver: SqlDriver) {
+/**
+ * @param driver the [SqlDriver] required to create the database.
+ * @param faker Fake data generator.
+ */
+fun testDriveDatabase(driver: SqlDriver, faker: Faker) {
     val database = SportsDatabase(driver)
+
     val playerQueries: PlayerQueries = database.playerQueries
 
+    // Show all players
     println(playerQueries.selectAll().executeAsList())
-    // [HockeyPlayer(15, "Ryan Getzlaf")]
 
-    playerQueries.insert(player_number = 10, full_name = "Corey Perry")
+
+    // Uses query param to insert data
+    playerQueries.insert(
+        player_number = Random.nextInt().absoluteValue,
+        full_name = faker.name.name()
+    )
     println(playerQueries.selectAll().executeAsList())
-    // [HockeyPlayer(15, "Ryan Getzlaf"), HockeyPlayer(10, "Corey Perry")]
 
-    val player = HockeyPlayer(10, "Ronald McDonald")
+    // Uses full data object to insert data
+    val player = HockeyPlayer(
+        player_number = Random.nextInt().absoluteValue,
+        full_name = faker.name.name()
+    )
     playerQueries.insertFullPlayerObject(player)
 }

src/main/sqldelight/dev/hossain/postgresqldelight/Player.sq

@@ -1,13 +1,11 @@
 -- Source: https://cashapp.github.io/sqldelight/2.0.0/jvm_postgresql/#fresh-schema
-CREATE TABLE hockeyPlayer (
+CREATE TABLE IF NOT EXISTS hockeyPlayer (
   player_number INTEGER PRIMARY KEY NOT NULL,
   full_name TEXT NOT NULL
 );
 
-CREATE INDEX hockeyPlayer_full_name ON hockeyPlayer(full_name);
+CREATE INDEX IF NOT EXISTS hockeyPlayer_full_name ON hockeyPlayer(full_name);
 
-INSERT INTO hockeyPlayer (player_number, full_name)
-VALUES (15, 'Ryan Getzlaf');
 
 selectAll:
 SELECT *
@@ -19,4 +17,9 @@ VALUES (?, ?);
 
 insertFullPlayerObject:
 INSERT INTO hockeyPlayer(player_number, full_name)
-VALUES ?;
+VALUES ?;
+
+
+-- tableExists:
+-- https://database.guide/5-ways-to-check-if-a-table-exists-in-postgresql/
+-- SELECT EXISTS (SELECT FROM pg_tables WHERE schemaname = 'public' AND tablename  = 'hockeyPlayer');