HHH-13788 Fix default IdentifierHelper case strategy

hibernate-core/src/main/java/org/hibernate/dialect/MariaDBDialect.java

@@ -6,6 +6,14 @@
  */
 package org.hibernate.dialect;
 
+import java.sql.DatabaseMetaData;
+import java.sql.SQLException;
+
+import org.hibernate.engine.jdbc.env.spi.AnsiSqlKeywords;
+import org.hibernate.engine.jdbc.env.spi.IdentifierCaseStrategy;
+import org.hibernate.engine.jdbc.env.spi.IdentifierHelper;
+import org.hibernate.engine.jdbc.env.spi.IdentifierHelperBuilder;
+
 /**
  * @author Vlad Mihalcea
  */
@@ -22,4 +30,15 @@ public class MariaDBDialect extends MySQL5Dialect {
 	protected MySQLStorageEngine getDefaultMySQLStorageEngine() {
 		return InnoDBStorageEngine.INSTANCE;
 	}
+
+	@Override
+	public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)
+			throws SQLException {
+
+		// some MariaDB drivers does not return case strategy info
+		builder.setUnquotedCaseStrategy( IdentifierCaseStrategy.MIXED );
+		builder.setQuotedCaseStrategy( IdentifierCaseStrategy.MIXED );
+
+		return super.buildIdentifierHelper( builder, dbMetaData );
+	}
 }

hibernate-core/src/main/java/org/hibernate/dialect/MySQLDialect.java

@@ -7,6 +7,7 @@
 package org.hibernate.dialect;
 
 import java.sql.CallableStatement;
+import java.sql.DatabaseMetaData;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Types;
@@ -27,6 +28,9 @@ import org.hibernate.dialect.pagination.LimitHandler;
 import org.hibernate.dialect.pagination.LimitHelper;
 import org.hibernate.dialect.unique.MySQLUniqueDelegate;
 import org.hibernate.dialect.unique.UniqueDelegate;
+import org.hibernate.engine.jdbc.env.spi.IdentifierCaseStrategy;
+import org.hibernate.engine.jdbc.env.spi.IdentifierHelper;
+import org.hibernate.engine.jdbc.env.spi.IdentifierHelperBuilder;
 import org.hibernate.engine.spi.RowSelection;
 import org.hibernate.exception.LockAcquisitionException;
 import org.hibernate.exception.LockTimeoutException;
@@ -562,6 +566,18 @@ public class MySQLDialect extends Dialect {
 		};
 	}
 
+	@Override
+	public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)
+			throws SQLException {
+
+		if ( dbMetaData == null ) {
+			builder.setUnquotedCaseStrategy( IdentifierCaseStrategy.MIXED );
+			builder.setQuotedCaseStrategy( IdentifierCaseStrategy.MIXED );
+		}
+
+		return super.buildIdentifierHelper( builder, dbMetaData );
+	}
+
 	@Override
 	public String getNotExpression(String expression) {
 		return "not (" + expression + ")";

hibernate-core/src/main/java/org/hibernate/dialect/PostgreSQL81Dialect.java

@@ -29,6 +29,9 @@ import org.hibernate.dialect.identity.PostgreSQL81IdentityColumnSupport;
 import org.hibernate.dialect.pagination.AbstractLimitHandler;
 import org.hibernate.dialect.pagination.LimitHandler;
 import org.hibernate.dialect.pagination.LimitHelper;
+import org.hibernate.engine.jdbc.env.spi.IdentifierCaseStrategy;
+import org.hibernate.engine.jdbc.env.spi.IdentifierHelper;
+import org.hibernate.engine.jdbc.env.spi.IdentifierHelperBuilder;
 import org.hibernate.engine.spi.RowSelection;
 import org.hibernate.exception.LockAcquisitionException;
 import org.hibernate.exception.spi.SQLExceptionConversionDelegate;
@@ -76,6 +79,18 @@ public class PostgreSQL81Dialect extends Dialect {
 		}
 	};
 
+	@Override
+	public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)
+			throws SQLException {
+
+		if ( dbMetaData == null ) {
+			builder.setUnquotedCaseStrategy( IdentifierCaseStrategy.LOWER );
+			builder.setQuotedCaseStrategy( IdentifierCaseStrategy.MIXED );
+		}
+
+		return super.buildIdentifierHelper( builder, dbMetaData );
+	}
+
 	/**
 	 * Constructs a PostgreSQL81Dialect
 	 */

hibernate-core/src/main/java/org/hibernate/dialect/SQLServerDialect.java

@@ -6,6 +6,8 @@
  */
 package org.hibernate.dialect;
 
+import java.sql.DatabaseMetaData;
+import java.sql.SQLException;
 import java.sql.Types;
 import java.util.Locale;
 
@@ -19,6 +21,9 @@ import org.hibernate.dialect.identity.SQLServerIdentityColumnSupport;
 import org.hibernate.dialect.pagination.LegacyLimitHandler;
 import org.hibernate.dialect.pagination.LimitHandler;
 import org.hibernate.dialect.pagination.TopLimitHandler;
+import org.hibernate.engine.jdbc.env.spi.IdentifierCaseStrategy;
+import org.hibernate.engine.jdbc.env.spi.IdentifierHelper;
+import org.hibernate.engine.jdbc.env.spi.IdentifierHelperBuilder;
 import org.hibernate.type.StandardBasicTypes;
 import org.hibernate.type.StringType;
 import org.hibernate.type.Type;
@@ -107,6 +112,18 @@ public class SQLServerDialect extends AbstractTransactSQLDialect {
 		return true;
 	}
 
+	@Override
+	public IdentifierHelper buildIdentifierHelper(
+			IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData) throws SQLException {
+
+		if ( dbMetaData == null ) {
+			builder.setUnquotedCaseStrategy( IdentifierCaseStrategy.MIXED );
+			builder.setQuotedCaseStrategy( IdentifierCaseStrategy.MIXED );
+		}
+
+		return super.buildIdentifierHelper( builder, dbMetaData );
+	}
+
 	@Override
 	public boolean supportsLimitOffset() {
 		return false;

hibernate-core/src/main/java/org/hibernate/engine/jdbc/env/spi/IdentifierHelperBuilder.java

@@ -38,7 +38,7 @@ public class IdentifierHelperBuilder {
 	private boolean globallyQuoteIdentifiers = false;
 	private boolean skipGlobalQuotingForColumnDefinitions = false;
 	private boolean autoQuoteKeywords = true;
-	private IdentifierCaseStrategy unquotedCaseStrategy = IdentifierCaseStrategy.MIXED;
+	private IdentifierCaseStrategy unquotedCaseStrategy = IdentifierCaseStrategy.UPPER;
 	private IdentifierCaseStrategy quotedCaseStrategy = IdentifierCaseStrategy.MIXED;
 
 	public static IdentifierHelperBuilder from(JdbcEnvironment jdbcEnvironment) {