Add examples of nullable primitives

examples/sqlc.yaml

@@ -1,9 +1,8 @@
 version: '2'
 plugins:
 - name: kt
-  wasm:
-    url: https://downloads.sqlc.dev/plugin/sqlc-gen-kotlin_1.2.0.wasm
-    sha256: 22b437ecaea66417bbd3b958339d9868ba89368ce542c936c37305acf373104b
+  process:
+    cmd: ../plugin/plugin
 sql:
 - schema: src/main/resources/authors/postgresql/schema.sql
   queries: src/main/resources/authors/postgresql/query.sql

examples/src/main/kotlin/com/example/ondeck/postgresql/Models.kt

@@ -17,6 +17,12 @@ enum class Status(val value: String) {
   }
 }
 
+data class CheckingAccount (
+  val id: Int,
+  val depositAmount: Int?,
+  val depositRate: Double?
+)
+
 data class City (
   val slug: String,
   val name: String

examples/src/main/kotlin/com/example/ondeck/postgresql/Queries.kt

@@ -11,6 +11,9 @@ import java.sql.Types
 import java.time.LocalDateTime
 
 interface Queries {
+  @Throws(SQLException::class)
+  fun createCheckingAccount(depositAmount: Int?, depositRate: Double?): CheckingAccount?
+
   @Throws(SQLException::class)
   fun createCity(name: String, slug: String): City?
 

examples/src/main/kotlin/com/example/ondeck/postgresql/QueriesImpl.kt

@@ -10,6 +10,11 @@ import java.sql.Statement
 import java.sql.Types
 import java.time.LocalDateTime
 
+const val createCheckingAccount = """-- name: createCheckingAccount :one
+INSERT INTO checking_accounts (deposit_amount, deposit_rate)
+VALUES (?, ?) RETURNING id, deposit_amount, deposit_rate
+"""
+
 const val createCity = """-- name: createCity :one
 INSERT INTO city (
     name,
@@ -101,6 +106,28 @@ data class VenueCountByCityRow (
 
 class QueriesImpl(private val conn: Connection) : Queries {
 
+  @Throws(SQLException::class)
+  override fun createCheckingAccount(depositAmount: Int?, depositRate: Double?): CheckingAccount? {
+    return conn.prepareStatement(createCheckingAccount).use { stmt ->
+      if (depositAmount != null) stmt.setInt(1, depositAmount) else stmt.setNull(1, Types.INTEGER)
+          if (depositRate != null) stmt.setDouble(2, depositRate) else stmt.setNull(2, Types.DOUBLE)
+
+      val results = stmt.executeQuery()
+      if (!results.next()) {
+        return null
+      }
+      val ret = CheckingAccount(
+                results.getInt(1),
+                results.getInt(2),
+                results.getDouble(3)
+            )
+      if (results.next()) {
+          throw SQLException("expected one row in result set, but got many")
+      }
+      ret
+    }
+  }
+
 // Create a new city. The slug must be unique.
 // This is the second line of the comment
 // This is the third line

examples/src/main/resources/ondeck/postgresql/query/checking_account.sql

@@ -0,0 +1,3 @@
+-- name: CreateCheckingAccount :one
+INSERT INTO checking_accounts (deposit_amount, deposit_rate)
+VALUES ($1, $2) RETURNING *;

examples/src/main/resources/ondeck/postgresql/schema/0004_checking_account.sql

@@ -0,0 +1,6 @@
+CREATE TABLE checking_accounts
+(
+    id             SERIAL PRIMARY KEY,
+    deposit_amount INT,
+    deposit_rate   DOUBLE PRECISION
+);