getMaxColumnsInGroupBy getMaxColumnsInOrderBy supportsGroupBy in Java

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// see Table 13-1 // see Table 13-1 // see Table 13-4
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Checking the getMaxColumnsInGroupBy and GetMaxColumnsInOrderBy calls will reassure you that all DBMSs allow at least 16 columns in GROUP BY and ORDER BY clauses so you'll know the SELECT doesn't have too many And checking the supportsGroupBy call will tell you that all DBMSs allow GROUP BY so GROUP BY in the SELECT is always legal With this information, you can save yourself the bother of writing special code in case the DBMS rejects your syntax Caveat: Sometimes a DBMS will return incorrect information For example, here is a method to ask about standard SQL-92 conformance:
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boolean b = dbmdsupportsANSI92EntryLevelSQL();
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MySQL will return true for this call, but the correct answer is false because MySQL doesn't support several SQL-92 Entry Level requirements Here's another example: Sybase returns false for every one of the stores calls shown in Table 13-3 This is obviously incorrect Sybase must store identifiers in some way! Notes on Table 13-1:
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getCatalogTerm row
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This row is "d" if the response is "database,""DL" if the response is "Database Link," and "D" if the response is "Database" A blank means the DBMS did not respond to the call
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getDefaultTransactionIsolationLevel row
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The following abbreviations are used for the isolation levels:
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READ UNCOMMITTED READ COMMITTED REPEATABLE READ SERIALIZABLE
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IsolationLevel(1) IsolationLevel(2) IsolationLevel(4) IsolationLevel(8)
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For Informix, InterBase, Microsoft, MySQL, and Oracle, our tests showed it was possible to group at least 20 columns o For Sybase, our tests showed it was possible to group at least 20 columns This differs from Sybase's response to getMaxColumnsInGroupBy, which returns 16 getMaxColumnsInOrderBy row o For InterBase and Oracle, our tests showed it was possible to sort up to 254 columns o For Informix, Microsoft, and MySQL, our tests showed it was possible to sort at least 1,000 columns o For Sybase, our tests showed it was possible to sort up to 31 columns This differs from Sybase's response to getMaxColumnsInOrderBy, which returns 16 getProcedureTerm row This row is "sp" if the response is "stored procedure," "dp" if the response is "database procedure," "PR" if the response is "PROCEDURE," "p" if the response is "procedure," "Pr" if the response is "Procedure," and "SP" if the response is "Stored Procedure"
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getSchemaTerm row
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This row is "s" if the response is "schema", "U" if the response is "Username," "o" if the response is "owner," and "O" if the response is "Owner" A blank means the DBMS did not respond to the call
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Table 13-2 DBMS Information According to DatabaseMetaData Methods; "nulls" Calls Actual Name Starts with "nulls" nulls Call IBM Informix Ingres InterBase Microsoft MySQL Oracle Sybase AreSortedAtEnd F F F F F F F F AreSortedAtStart F F F F F T F F AreSortedHigh T F T T F F F T AreSortedLow F T F F T F T F Notes on Table 13-2:
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For InterBase, our tests showed that NULLs sort At End that is, NULLs come out at the end of a sorted list when you ORDER BY ASC as well as when you ORDER BY DESC This differs from InterBase's response to (a) NullsAreSortedAtEnd, which returns false and (b) NullsAreSortedHigh, which returns true For MySQL and Sybase, our tests showed that NULLs sort Low that is, as if NULLs are less than all other values In the first case, this differs from MySQL's response to (a) NullsAreSortedLow, which returns false and (b) NullsAreSortedAtStart, which returns true In the second case, this differs from Sybase's response to (a) NullsAreSortedLow, which returns false and (b) NullsAreSortedHigh, which returns true For Oracle, our tests showed that NULLs sort High that is, as if NULLs are greater than all other values This differs from Oracle's response to (a) NullsAreSortedHigh, which returns false and (b) NullsAreSortedLow, which returns true
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Table 13-3 DBMS Information According to DatabaseMetaData Methods; "stores" Calls Actual Name Starts with "stores" stores Call IBM Informix Ingres InterBase Microsoft MySQL Oracle Sybase LowercaseIdentifiers F T T F F F F F LowercaseQuotedIdentifiers F T T F F F F F MixedCaseIdentifiers F F F F T T F F MixedCaseQuotedIdentifiers F F F F T F F F UppercaseIdentifiers T F F T F F T F UppercaseQuotedIdentifiers F F F F F F F F
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Table 13-4 DBMS Information According to DatabaseMetaData Methods; "supports" Calls Actual Name Starts with "supports" supports Call IBM Informix Ingres InterBase Microsoft MySQL Oracle Syb AlterTableWithAddColumn T T F T T T T T AlterTableWithDropColumn F T F T F T F F ANSI92EntryLevelSQL T T T T T T T T ANSI92FullSQL F F F F F F F F ANSI92IntermediateSQL F F F F F F F F ColumnAliases T F F T T T T T CoreSQLGrammar T T T T T T T F CorrelatedSubqueries T T T T T F T T DataDefinitionAndDataManipulationTransactions T F T T T T T F DataManipulationTransactionsOnly F F F F F T T T ExpressionsInOrderBy T F F F T T T T ExtendedSQLGrammar T F F T F F F F FullOuterJoins F F F F F T F F GroupBy T T T T T T T T IntegrityEnhancementFacility T F F T T F F T LikeEscapeClause T T T T T T T F MinimumSQLGrammar T T T T T T T T MixedCaseIdentifiers F T T F F F T T
MixedCaseQuotedIdentifiers nonNullableColumns OpenCursorsAcrossCommit OpenCursorsAcrossRollback OrderByUnrelated OuterJoins PositionedDelete PositionedUpdate SelectForUpdate StoredProcedures SubqueriesInComparisons SubqueriesInExists SubqueriesInIns SubqueriesInQuantifieds TableCorrelationNames TransactionIsolationLevel(0) TransactionIsolationLevel(1) TransactionIsolationLevel(2) TransactionIsolationLevel(4) TransactionIsolationLevel(8) Transactions Union UnionAll