Exception while trying to update an JDBC ResultSet using a H2 database

Question

I try to insert a row using a ResultSet into a H2 database (1.4.182). By invoking insertRow the program throws an exception. And I have no clue what the problem is.

The exception is:

The result set is not updatable. The query must select all columns from a unique key.
Only one table may be selected. [90127-182]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
    at org.h2.message.DbException.get(DbException.java:179)
    at org.h2.message.DbException.get(DbException.java:155)
    at org.h2.message.DbException.get(DbException.java:144)
    at org.h2.jdbc.JdbcResultSet.getUpdatableRow(JdbcResultSet.java:3081)
    at org.h2.jdbc.JdbcResultSet.insertRow(JdbcResultSet.java:2966)
    at JdbcResultSetUpdate.main(JdbcResultSetUpdate.java:26)

The SQL statement the program executes to create the ResultSet is:

"select NAME from TEST.TST_DOZENT"

TST_DOZENT is created by the statement:

"CREATE TABLE TEST.TST_DOZENT (NAME VARCHAR(50))", "Create TST_DOZENT-Tab"

So the query-statement doesn't use a system-table, the table has no primary-key.

The java statement object is created by:

con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);

I can't fugure out what the problem is or what I'm doing wrong.

I would appreciate any help.

Thany you for reading.

Answer 1

The table needs to have a primary key or unique index, and the query needs to contain that column. Example:

CREATE TABLE TEST.TST_DOZENT (ID PRIMARY KEY, NAME VARCHAR(50));
SELECT ID, NAME FROM TEST.TST_DOZENT;