PostgreSql json error

In Ktorm 3.3,

I have a postgresql database with a table that has a column named ‘template’ that has a datatype of json.

import org.ktorm.jackson.json
import org.ktorm.schema.Table

object TestTable: Table<TestTable>("test_table") {
    val id = varchar("id").primaryKey().bindTo { it.id }
    val template = json<Template>("template").bindTo { it.template }
}

interface TestTable: Entity<TestTable> {
    companion object: Entity.Factory<TestTable>()
    var id: String
    var template: Template?
}

I am able to successfully pull the model including the json field using the below query

fun findById(id: String): TestTable? { return database.sequenceOf(TestTable) .find { it.id eq id } }

However when I try to patch the table using the below query I get the following error

fun insertOrUpdateById(id: String, testTable: TestTable): Int {
        return database.insertOrUpdate(TestTable) {
            set(it.template, testTable.template)
            onConflict {
                set(it.template, testTable.template)
            }
        }
    }

Ktorm; bad SQL grammar []; nested exception is org.postgresql.util.PSQLException: ERROR: column \"template\" is of type json but expression is of type character varying\n  Hint: You will need to rewrite or cast the expression.\n  Position: 59

Do I need to do something specific in order to update the json value?

[Tmilly]

Hey Vincent, thanks for the quick responses. I had to stub a lot of the data in my example due to it being corporate code so if it’s not entirely syntactically correct, thats why. Also I very much appreciate you telling me what the culprit could be otherwise I wouldn’t have been able to come up with the following workaround.

I created a custom SqlType for postgres’s Json type, the only difference I made was to the doSetParameter function, the rest of the class is the same implementation as the default JsonSqlType.

import org.postgresql.util.PGobject

override fun doSetParameter(ps: PreparedStatement, index: Int, parameter: T) {
    val jsonObject = PGobject()
    jsonObject.apply {
        type = "json"
        value = objectMapper.writeValueAsString(parameter)
    }
    ps.setObject(index, jsonObject)
}

This did the trick!

[vincentlauvlwj]

@hurui200320 Fixed in 3.4.1