com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'RECEPTORS.r_name' in 'field list' - mysql

Question

I am using play 2.3.8 framework to create an API and access mariaDB. When I ran the query on mariaDB console, it works OK but when I run it from play I get error that the field RECEPTORS.r_name is not available which is not true.
My code is
package models.dao
import anorm._
import models.Profile
import play.api.db.DB
import play.api.Play.current
object ProfileDAO {
def index(r_name: String): List[Profile] = {
DB.withConnection { implicit c =>
val results = SQL(
"""
| SELECT `RECEPTORS.r_name`,`RECEPTORS.pdbCode`, `LIGANDS.l_id`, `LIGANDS.l_score`
| FROM `RECEPTORS`
| INNER JOIN `LIGANDS`
| WHERE `RECEPTORS.r_name`={r_name};
""".stripMargin).on(
"r_name" -> r_name
).apply()
results.map { row =>
Profile(row[String]("r_name"), row[String]("pdbCode"),row[String]("l_id"),row[Double]("l_score"))
}.force.toList
}
}
}
Query that I ran on mariaDB console is
SELECT RECEPTORS.r_name, pdbCode, l_id, l_score FROM RECEPTORS INNER JOIN LIGANDS WHERE RECEPTORS.r_name="receptor";
Error which running with Play 2.3.8 is as follows
laeeq#optiplex:~/Desktop/Backup/Project5/cpvsAPI$ sbt -jvm-debug 9999
run Listening for transport dt_socket at address: 9999 [info] Loading
project definition from
/home/laeeq/Desktop/Backup/Project5/cpvsAPI/project [info] Set current
project to cpvsAPI (in build
file:/home/laeeq/Desktop/Backup/Project5/cpvsAPI/) [info] Updating
{file:/home/laeeq/Desktop/Backup/Project5/cpvsAPI/}root... [info]
Resolving jline#jline;2.11 ... [info] Done updating.
--- (Running the application, auto-reloading is enabled) ---
[info] play - Listening for HTTP on /0:0:0:0:0:0:0:0:9000
(Server started, use Ctrl+D to stop and go back to the console...)
SLF4J: The following set of substitute loggers may have been accessed
SLF4J: during the initialization phase. Logging calls during this
SLF4J: phase were not honored. However, subsequent logging calls to
these SLF4J: loggers will work as normally expected. SLF4J: See also
http://www.slf4j.org/codes.html#substituteLogger SLF4J:
org.webjars.WebJarExtractor [info] Compiling 1 Scala source to
/home/laeeq/Desktop/Backup/Project5/cpvsAPI/target/scala-2.11/classes...
[info] play - database [default] connected at
jdbc:mysql://localhost:3306/db_profile [info] play - Application
started (Dev) [error] application -
! #766oc7b8l - Internal server error, for (GET) [/profiles/receptor]
->
play.api.Application$$anon$1: Execution
exception[[MySQLSyntaxErrorException: Unknown column
'RECEPTORS.r_name' in 'field list']] at
play.api.Application$class.handleError(Application.scala:296)
~[play_2.11-2.3.8.jar:2.3.8] at
play.api.DefaultApplication.handleError(Application.scala:402)
[play_2.11-2.3.8.jar:2.3.8] at
play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$14$$anonfun$apply$1.applyOrElse(PlayDefaultUpstreamHandler.scala:205)
[play_2.11-2.3.8.jar:2.3.8] at
play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$14$$anonfun$apply$1.applyOrElse(PlayDefaultUpstreamHandler.scala:202)
[play_2.11-2.3.8.jar:2.3.8] at
scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
[scala-library-2.11.1.jar:na] Caused by:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown
column 'RECEPTORS.r_name' in 'field list' at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
~[na:1.8.0_151] at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
~[na:1.8.0_151] at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
~[na:1.8.0_151] at
java.lang.reflect.Constructor.newInstance(Constructor.java:423)
~[na:1.8.0_151] at
com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
~[mysql-connector-java-5.1.18.jar:na]

Answer 1

You need to quote the table and column individually, so use:
`RECEPTORS`.`r_name`
otherwise MySQL thinks you are trying to reference a column with the name RECEPTORS.r_name in some implicit table.
You need to do this for all your (quoted) column references. Specifically in this case, quoting seems to be unnecessary, so you could also just use RECEPTORS.r_name without backticks.