ORA-01735 when altering table with inline constraint

Question

Oracle Version: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production

Query: ALTER TABLE "TAB" ADD "XVAR" CLOB CHECK ("XVAR" IS JSON);

I can't quite understand what is wrong with this statement. Can someone point out what is wrong with this ?

As far as I understand, the constraint does not need to be named by default. Even naming the constraint has not helped here.

I'm trying to run the query on the DB via the go-oci8 driver .

The code to do the same is:

package main

import (
"database/sql"
"fmt"
_ "github.com/mattn/go-oci8"
)

func main() {
db, err := sql.Open("oci8", "<connectionString>")
if err != nil {
    fmt.Println(err)
    return
}
defer func(db *sql.DB) {
    if err := db.Close(); err != nil{
        fmt.Println(err)
    }
}(db)

_sql := `ALTER TABLE "TAB" ADD "XVAR" CLOB CHECK ("XVAR" IS JSON);`

result, err := db.Exec(_sql)
if err != nil {
    fmt.Println("Issue with altering table...")
    fmt.Println(err)
    return
}

fmt.Println(result.RowsAffected())

}

Output:

Issue with altering table...
ORA-01735: invalid ALTER TABLE option

Is there anything wrong with my query ? Or does it look like an issue with the 3rd party driver I'm using to do the same ?

Answer 1

Remove the semicolon at the end of the ALTER statement:

_sql := `ALTER TABLE "TAB" ADD "XVAR" CLOB CHECK ("XVAR" IS JSON)`

The semicolon is client statement separator and is not part of the actual statement (for SQL; PL/SQL is a different matter).

Demo of the problem and fix, via dynamic SQL rather than your stack, but same problem and solution:

BEGIN
  EXECUTE IMMEDIATE 'ALTER TABLE "TAB" ADD "XVAR" CLOB CHECK ("XVAR" IS JSON);';
END;
/

ORA-01735: invalid ALTER TABLE option
ORA-06512: at line 2

BEGIN
  EXECUTE IMMEDIATE 'ALTER TABLE "TAB" ADD "XVAR" CLOB CHECK ("XVAR" IS JSON)';
END;
/

Table altered.

db<>fiddle