Home/ Questions/Q 7706923
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-01T00:13:53+00:00

I am currently working on a solution in C# to copy database tables across

  • 0

I am currently working on a solution in C# to copy database tables across from Oracle to PostgreSQL. Everything is working great apart from one thing. When I get to copying one of my table which contains sql statements in one of its fields it falls over due to having two single quotes back to back. The SQL statements MUST remain in the table as it is being used to make another program database agnostic.

Is there a way to write the following SQL but without having the two single quotes back to back as seen near the ‘TRUE’ value near the end of the line. I have also included my code below to show how the statement is built up in C#. The column is a varchar2 in Oracle and a TEXT column in PostgreSQL.

EDIT: The sql example shown is the actual INSERT statement generated by my C# code which will then be run on the postgresql database to add a record to a table. It will be used to insert a text field, among others, that contains an sql statement in the form of a string. 

INSERT INTO SQL_FACTORY_TEST (SQL_FACTORY_TEST_ID,SQL_FACTORY_DIALECT,SQL_FACTORY_QUERY_NAME,SQL_FACTORY_SQL_COMMAND,USER_NAME) 
VALUES (21, 'ORACLE', 'GET_CLUSTERS', 'SELECT CLUSTER_ID, NUM_POINTS, FEATURE_PK, A.CELL_CENTROID.SDO_POINT.X, A.CELL_CENTROID.SDO_POINT.Y, A.CLUSTER_CENTROID.SDO_POINT.X, A.CLUSTER_CENTROID.SDO_POINT.Y, TO_CHAR (A.CLUSTER_EXTENT.GET_WKT ()),  TO_CHAR (A.CELL_GEOM.GET_WKT ()), A.CLUSTER_EXTENT.SDO_SRID FROM (SELECT CLUSTER_ID, NUM_POINTS, FEATURE_PK, SDO_CS.transform (CLUSTER_CENTROID, 4326) cluster_centroid, CLUSTER_EXTENT, SDO_CS.transform (CELL_CENTROID, 4326) cell_centroid, CELL_GEOM FROM :0) a  where sdo_filter( A.CELL_GEOM, SDO_CS.transform(mdsys.sdo_geometry(2003, :1, NULL, mdsys.sdo_elem_info_array(1,1003,3),mdsys.sdo_ordinate_array(:2, :3, :4, :5)),81989)) = 'TRUE'', 'PUBLIC')

Code sample: 

oleDataBaseConnection.OleExecutePureSqlQuery("SELECT * FROM " + tableName);

    if (oleDataBaseConnection.HasRows())
    {
        while (oleDataBaseConnection.NextRecord())
        {
            Dictionary<string, string> postgreSQLQueries = TypeConversion.GetQueryDictionary("POSTGRESQL");

            string postgreSQLInsertQuery;

            postgreSQLQueries.TryGetValue("INSERT", out postgreSQLInsertQuery);

            postgreSQLInsertQuery = postgreSQLInsertQuery.Replace("{0}", tableName);

            StringBuilder postgresQuery = new StringBuilder();

            postgresQuery.Append(postgreSQLInsertQuery);

            postgresQuery.Append("(");

            int columnCounter = 0;

            //add a column parameter to query for each of our columns
            foreach (KeyValuePair<string, string> t in columnData)
            {
                postgresQuery.Append(t.Key + ",");
                columnCounter++;
            }

            postgresQuery = postgresQuery.Remove(postgresQuery.Length - 1, 1);
            postgresQuery.Append(") ");

            postgresQuery.Append("VALUES (");

            //Loop through values and 

            for (int i = 0; i < columnCounter; i++)
            {
                string[] foo = new string[columnData.Count];
                columnData.Values.CopyTo(foo, 0);

                if (foo[i].ToUpper() == "TEXT")
                {
                    postgresQuery.Append("'" + oleDataBaseConnection.GetFieldById(i) + "', ");
                }
                else
                {
                    postgresQuery.Append(oleDataBaseConnection.GetFieldById(i) + ", ");
                }
            }

            postgresQuery = postgresQuery.Remove(postgresQuery.Length - 2, 2);
            postgresQuery.Append(") ");
            postgresSQLDBConnection.PostgreSQLExecutePureSqlNonQuery(postgresQuery.ToString());
        }
    }
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    The best solution is to use a PreparedStatement where you don’t pass literals directly. I don’t know C#, so I can’t give you an example for that.

    However if you have to keep the statement like that, you can use a “dollar quoted” string literal in PostgreSQL.

    INSERT INTO SQL_FACTORY_TEST (SQL_FACTORY_TEST_ID,SQL_FACTORY_DIALECT,SQL_FACTORY_QUERY_NAME,SQL_FACTORY_SQL_COMMAND,USER_NAME) 
VALUES (21, 'ORACLE', 'GET_CLUSTERS', $$ ...... 'TRUE'$$, 'PUBLIC')

    The $$ replaces the single quote(s) around the literal. If there is a chance that your value contains $$ you can also add some unique identifier to it, e.g. 

    $42$String with embedded single quotes ''' and two $$ dollar characters$42$
    • 0