SQL validation macro

README.md

@@ -73,4 +73,47 @@ DB.autoClose(conn) { db =>
     println(rs.getString("USER_NAME"))
   }
 }
-```
+```
+
+## SQL Validation (Experimental)
+
+scala-jdbc provides `sqlc` macro that validates a given SQL. You can use it instead of sql string interpolation.
+
+```scala
+db.selectFirst(sqlc("SELECT * FROM USERS WHERE USER_ID = $userId")){ rs =>
+  (rs.getInt("USER_ID"), rs.getString("USER_NAME"))
+}
+```
+
+When a given SQL is invalid, this macro reports error in compile time.
+
+In default, this macro checks only sql syntax.
+It's also possible to check existence of tables and columns by database schema definition by defining `schema.json` in the current directory.
+Here is an example of `schema.json`:
+
+```javascript
+{
+  "tables":[
+    {
+      "name": "USER",
+      "columns": [
+        { "name": "USER_ID" },
+        { "name": "USER_NAME" },
+        { "name": "DEPT_ID" }
+      ]
+    },
+    {
+      "name": "COMPANY",
+      "columns": [
+        { "name": "COMPANY_ID" },
+        { "name": "COMPANY_NAME" }
+      ]
+    }
+  ]
+}
+```
+
+However `sqlc` macro is still experimental feature.
+If you get invalid validation results, please report them to [issues](https://github.com/takezoe/scala-jdbc/issues).
+
+

build.sbt

@@ -2,10 +2,20 @@ name := "scala-jdbc"
 
 organization := "com.github.takezoe"
 
-version := "1.0.2"
+version := "1.0.3-SNAPSHOT"
 
 scalaVersion := "2.11.8"
 
+libraryDependencies ++= Seq(
+  "com.github.jsqlparser" % "jsqlparser" % "0.9.6",
+  "org.scalamacros" %% "resetallattrs"  % "1.0.0",
+  "com.fasterxml.jackson.module" %% "jackson-module-scala"  % "2.7.2",
+  "com.github.pathikrit" %% "better-files" % "2.15.0",
+  "org.scala-lang" % "scala-reflect"  % scalaVersion.value,
+  "org.scala-lang" % "scala-compiler" % scalaVersion.value % "provided",
+  "org.scalatest" %% "scalatest" % "2.2.1" % "test"
+)
+
 publishMavenStyle := true
 
 publishTo <<= version { (v: String) =>

schema.json

@@ -0,0 +1,49 @@
+{
+  "tables":[
+    {
+      "name": "USER",
+      "columns": [
+        {
+          "name": "USER_ID"
+        },
+        {
+          "name": "USER_NAME"
+        },
+        {
+          "name": "DEPT_ID"
+        }
+      ]
+    },
+    {
+      "name": "COMPANY",
+      "columns": [
+        {
+          "name": "COMPANY_ID"
+        },
+        {
+          "name": "COMPANY_NAME"
+        }
+      ]
+    },
+    {
+      "name": "DEPT",
+      "columns": [
+        {
+          "name": "DEPT_ID"
+        },
+        {
+          "name": "DEPT_NAME"
+        }
+      ]
+    },
+    {
+      "name": "DEPT_GROUP",
+      "columns": [
+        {
+          "name": "DEPT_ID"
+        }
+      ]
+    }
+
+  ]
+}

src/main/scala/com/github/takezoe/scala/jdbc/package.scala

@@ -1,5 +1,11 @@
 package com.github.takezoe.scala
 
+import com.github.takezoe.scala.jdbc.SqlTemplate
+
+import scala.language.experimental.macros
+import scala.reflect.macros.blackbox.Context
+import com.github.takezoe.scala.jdbc.validation._
+
 package object jdbc {
 
   /**
@@ -11,9 +17,54 @@ package object jdbc {
    * String interpolation to convert a variable-embedded SQL to SqlTemplate
    */
   implicit class SqlStringInterpolation(val sc: StringContext) extends AnyVal {
-    def sql(args: Any*): SqlTemplate = SqlTemplate(sc.parts.mkString("?"), args.toSeq)
+    def sql(args: Any*): SqlTemplate = {
+      val sql = sc.parts.mkString
+      SqlTemplate(sql, args.toSeq)
+    }
   }
 
   case class SqlTemplate(sql: String, params: Any*)
 
+  /**
+   * Macro version of sql string interpolation.
+   * This macro validates the given sql in compile time and returns SqlTemplate as same as string interpolation.
+   */
+  def sqlc(sql: String): com.github.takezoe.scala.jdbc.SqlTemplate = macro Macros.validateSqlMacro
+
+}
+
+object Macros {
+
+  def validateSqlMacro(c: Context)(sql: c.Expr[String]): c.Expr[com.github.takezoe.scala.jdbc.SqlTemplate] = {
+    import c.universe._
+    sql.tree match {
+      case Literal(x) => x.value match {
+        case sql: String => SqlValidator.validateSql(sql, c)
+          val Apply(fun, _) = reify(new SqlTemplate("")).tree
+          c.Expr[com.github.takezoe.scala.jdbc.SqlTemplate](Apply.apply(fun, Literal(x) :: Nil))
+      }
+      case Apply(Select(Apply(Select(Select((_, _)), _), trees), _), args) => {
+        val sql = trees.collect { case Literal(x) => x.value.asInstanceOf[String] }.mkString("?")
+        SqlValidator.validateSql(sql, c)
+        val Apply(fun, _) = reify(new SqlTemplate("")).tree
+        c.Expr[SqlTemplate](Apply.apply(fun, Literal(Constant(sql)) :: args))
+      }
+      case Select(Apply(Select(a, b), List(Literal(x))), TermName("stripMargin")) => {
+        x.value match {
+          case s: String =>
+            val sql = s.stripMargin
+            SqlValidator.validateSql(sql, c)
+            val Apply(fun, _) = reify(new SqlTemplate("")).tree
+            c.Expr[SqlTemplate](Apply.apply(fun, Literal(Constant(sql)) :: Nil))
+        }
+      }
+      case Select(Apply(_, List(Apply(Select(Apply(Select(Select((_, _)), _), trees), _), args))), TermName("stripMargin")) => {
+        val sql = trees.collect { case Literal(x) => x.value.asInstanceOf[String] }.mkString("?").stripMargin
+        SqlValidator.validateSql(sql, c)
+        val Apply(fun, _) = reify(new SqlTemplate("")).tree
+        c.Expr[SqlTemplate](Apply.apply(fun, Literal(Constant(sql)) :: args))
+      }
+    }
+  }
+
 }

src/main/scala/com/github/takezoe/scala/jdbc/validation/DeleteValidator.scala

@@ -0,0 +1,45 @@
+package com.github.takezoe.scala.jdbc.validation
+
+import net.sf.jsqlparser.expression.ExpressionVisitorAdapter
+import net.sf.jsqlparser.schema.Column
+import net.sf.jsqlparser.statement.delete.Delete
+import net.sf.jsqlparser.statement.select.SubSelect
+
+import scala.reflect.macros.blackbox
+
+class DeleteValidator(c: blackbox.Context, delete: Delete, schema: Map[String, TableDef]) {
+
+  def validate(): Unit = {
+    val tableName = delete.getTable.getName
+
+    schema.get(tableName) match {
+      case None => if(schema.nonEmpty){
+        c.error(c.enclosingPosition, "Table " + tableName + " does not exist.")
+      }
+      case Some(tableDef) => {
+        val select = new SelectModel()
+        val tableModel = new TableModel()
+        tableModel.select = Left(tableName)
+        select.from += tableModel
+
+        delete.getWhere.accept(new ExpressionVisitorAdapter {
+          override def visit(column: Column): Unit = {
+            val c = new ColumnModel()
+            c.name = column.getColumnName
+            c.table = Option(tableName)
+            select.where += c
+          }
+
+          override def visit(subSelect: SubSelect): Unit = {
+            val visitor = new SelectVisitor(c)
+            subSelect.getSelectBody.accept(visitor)
+            select.others += visitor.select
+          }
+        })
+
+        select.validate(c, schema)
+      }
+    }
+  }
+
+}

src/main/scala/com/github/takezoe/scala/jdbc/validation/InsertValidator.scala

@@ -0,0 +1,31 @@
+package com.github.takezoe.scala.jdbc.validation
+
+import net.sf.jsqlparser.statement.insert.Insert
+
+import scala.collection.JavaConverters._
+import scala.reflect.macros.blackbox
+
+class InsertValidator(c: blackbox.Context, insert: Insert, schema: Map[String, TableDef]) {
+
+  def validate(): Unit = {
+    val tableName = insert.getTable.getName
+
+    schema.get(tableName) match {
+      case None => if(schema.nonEmpty){
+        c.error(c.enclosingPosition, "Table " + tableName + " does not exist.")
+      }
+      case Some(tableDef) => insert.getColumns.asScala.foreach { column =>
+        if(!tableDef.columns.exists(_.name == column.getColumnName)){
+          c.error(c.enclosingPosition, "Column " + column.getColumnName + " does not exist in " + tableDef.name + ".")
+        }
+      }
+    }
+
+    if(insert.getSelect != null){
+      val visitor = new SelectVisitor(c)
+      insert.getSelect.getSelectBody.accept(visitor)
+      visitor.select.validate(c, schema)
+    }
+  }
+
+}

src/main/scala/com/github/takezoe/scala/jdbc/validation/SchemaDef.scala

@@ -0,0 +1,32 @@
+package com.github.takezoe.scala.jdbc.validation
+
+import better.files.File
+import com.fasterxml.jackson.databind.{DeserializationFeature, ObjectMapper}
+import com.fasterxml.jackson.module.scala.DefaultScalaModule
+
+case class SchemaDef(tables: Seq[TableDef])
+
+case class TableDef(name:String, columns: Seq[ColumnDef])
+
+case class ColumnDef(name: String)
+
+object SchemaDef {
+
+  private val mapper = new ObjectMapper()
+  mapper.enable(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS)
+  mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
+  mapper.registerModule(DefaultScalaModule)
+
+  def load(): Map[String, TableDef] = {
+    val file = File("schema.json")
+    val schema: Map[String, TableDef] = if(file.exists){
+      val json = file.contentAsString
+      val schema = mapper.readValue(json, classOf[SchemaDef])
+      schema.tables.map { t => t.name -> t }.toMap
+    } else {
+      Map.empty
+    }
+    schema
+  }
+
+}

src/main/scala/com/github/takezoe/scala/jdbc/validation/SelectValidator.scala

@@ -0,0 +1,16 @@
+package com.github.takezoe.scala.jdbc.validation
+
+import net.sf.jsqlparser.statement.select.Select
+
+import scala.reflect.macros.blackbox
+
+class SelectValidator(c: blackbox.Context, select: Select, schema: Map[String, TableDef]) {
+
+  def validate(): Unit = {
+    val visitor = new SelectVisitor(c)
+    select.getSelectBody.accept(visitor)
+
+    visitor.select.validate(c, schema)
+  }
+
+}