Prior to this commit and the previous commit, SimpleJdbcInsert did not
provide built-in support for "quoted identifiers". Consequently, if any
column names conflicted with keywords or functions from the underlying
database, you had to manually quote the column names when specifying
them via `usingColumns(...)`, and there was unfortunately no way to
quote schema and table names.
The previous commit provided rudimentary support for quoted SQL
identifiers (schema, table, and column names) by querying
java.sql.DatabaseMetaData.getIdentifierQuoteString() to determine the
quote string. It also introduced `usingEscaping(boolean)` in
`SimpleJdbcInsertOperations` to enable the feature. However, it
incorrectly quoted the schema and table names together, and it did not
take into account the fact that a quoted identifier should respect the
casing (uppercase vs. lowercase) of the underlying database's metadata.
This commit revises quoted identifier support in `SimpleJdbcInsert` by:
- renaming `usingEscaping(boolean)` to `usingQuotedIdentifiers()`
- quoting schema and table names separately
- respecting the casing (uppercase vs. lowercase) of the underlying
database's metadata when quoting identifiers
- introducing integration tests against an in-memory H2 database
See gh-13874
Closes gh-24013
7dc0653f38