通过 Scala Anorm（在 Play Framework 中）将数据插入 PostgreSQL jsonb 列

Question

The data column of PostgreSQL table my_table is of format jsonb . I would like to insert a Scala JsObject (or JsValue ), but don't know how to do it!

The following code does not compile, because the on function expects json to be a String :

  def add(json: JsObject): Option[Long] = {
    DB.withConnection {
      implicit c =>

        val query = """
             insert into my_table(data)
        values({data});"""

        SQL(query).on(
          "data" -> json
        ).executeInsert()
    }
  }

What is the solution?

Answer 1

Use ::jsonb tag at the end of a value. eg.

//my scala variables

val jsonDescription: String = "{\"name\":\"ksulr\"}"
val age = 15

//my insert statement
val sql = "INSERT into person(json_description,age) VALUES(?::jsonb,?)"

//prepared statement
val statement = conn.prepareStatement(sql)

//insert values into the sql statement
statement.setString(1,jsonDescription)
statement.setInt(2,age)

statement.executeUpdate()

This will work. It worked for me. Thats how I inserted into a postgres db column of type jsonb .

Answer 2

You can use ToStatement converter object:

def add(json: JsObject): Option[Long] = {
   DB.withConnection { implicit c =>       
      val query = """insert into my_table(data) values(${data});"""
      SQL(query).executeInsert()
   }
}

implicit object jsObjectStatement extends ToStatement[JsObject] {
    override def set(s: PreparedStatement, index: Int, v: JsObject): Unit = {
      val jsonObject = new PGobject()
      jsonObject.setType("json")
      jsonObject.setValue(Json.stringify(v))
      s.setObject(index, jsonObject)
    }
  }

Answer 3

Borrowing from @KJay_wer, we can use ::jsonb tag with Scala Anorm (Play Framework) too, and convert your JsObject (or other JsValue ) into String :

def add(json: JsObject): Option[Long] = {
    DB.withConnection {
      implicit c =>

        val query = """
             insert into my_table (data)
             values ({data}::jsonb);
             """.stripMargin

        SQL(query).on(
          "data" -> json.toString
        ).executeInsert()
    }
  }