Add full support for MariaDB

This commit adds full support for MariaDB as
a job repository and removes the code that
treats it as MySQL.

Resolves #3891
Resolves #4217

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/builder/JdbcPagingItemReaderBuilder.java

@@ -27,6 +27,7 @@ import org.springframework.batch.item.database.support.DerbyPagingQueryProvider;
 import org.springframework.batch.item.database.support.H2PagingQueryProvider;
 import org.springframework.batch.item.database.support.HanaPagingQueryProvider;
 import org.springframework.batch.item.database.support.HsqlPagingQueryProvider;
+import org.springframework.batch.item.database.support.MariaDBPagingQueryProvider;
 import org.springframework.batch.item.database.support.MySqlPagingQueryProvider;
 import org.springframework.batch.item.database.support.OraclePagingQueryProvider;
 import org.springframework.batch.item.database.support.PostgresPagingQueryProvider;
@@ -49,6 +50,7 @@ import org.springframework.util.Assert;
  * @author Michael Minella
  * @author Glenn Renfro
  * @author Drummond Dawson
+ * @author Mahmoud Ben Hassine
  * @since 4.0
  * @see JdbcPagingItemReader
  */
@@ -360,6 +362,9 @@ public class JdbcPagingItemReaderBuilder<T> {
 				case MYSQL:
 					provider = new MySqlPagingQueryProvider();
 					break;
+				case MARIADB:
+					provider = new MariaDBPagingQueryProvider();
+					break;
 				case ORACLE:
 					provider = new OraclePagingQueryProvider();
 					break;

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/support/DefaultDataFieldMaxValueIncrementerFactory.java

@@ -40,6 +40,7 @@ import static org.springframework.batch.support.DatabaseType.DERBY;
 import static org.springframework.batch.support.DatabaseType.H2;
 import static org.springframework.batch.support.DatabaseType.HANA;
 import static org.springframework.batch.support.DatabaseType.HSQL;
+import static org.springframework.batch.support.DatabaseType.MARIADB;
 import static org.springframework.batch.support.DatabaseType.MYSQL;
 import static org.springframework.batch.support.DatabaseType.ORACLE;
 import static org.springframework.batch.support.DatabaseType.POSTGRES;
@@ -109,6 +110,9 @@ public class DefaultDataFieldMaxValueIncrementerFactory implements DataFieldMaxV
 			mySQLMaxValueIncrementer.setUseNewConnection(true);
 			return mySQLMaxValueIncrementer;
 		}
+		else if (databaseType == MARIADB) {
+			return new MariaDBSequenceMaxValueIncrementer(dataSource, incrementerName);
+		}
 		else if (databaseType == ORACLE) {
 			return new OracleSequenceMaxValueIncrementer(dataSource, incrementerName);
 		}

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/support/MariaDBPagingQueryProvider.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.batch.item.database.support;
+
+import org.springframework.batch.item.database.PagingQueryProvider;
+import org.springframework.util.StringUtils;
+
+/**
+ * MariaDB implementation of a {@link PagingQueryProvider} using database specific
+ * features.
+ *
+ * @author Mahmoud Ben Hassine
+ * @since 5.0
+ */
+public class MariaDBPagingQueryProvider extends AbstractSqlPagingQueryProvider {
+
+	@Override
+	public String generateFirstPageQuery(int pageSize) {
+		return SqlPagingQueryUtils.generateLimitSqlQuery(this, false, buildLimitClause(pageSize));
+	}
+
+	@Override
+	public String generateRemainingPagesQuery(int pageSize) {
+		if (StringUtils.hasText(getGroupClause())) {
+			return SqlPagingQueryUtils.generateLimitGroupedSqlQuery(this, buildLimitClause(pageSize));
+		}
+		else {
+			return SqlPagingQueryUtils.generateLimitSqlQuery(this, true, buildLimitClause(pageSize));
+		}
+	}
+
+	private String buildLimitClause(int pageSize) {
+		return new StringBuilder().append("LIMIT ").append(pageSize).toString();
+	}
+
+}

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/support/MariaDBSequenceMaxValueIncrementer.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.batch.item.database.support;
+
+import javax.sql.DataSource;
+
+import org.springframework.jdbc.support.incrementer.AbstractSequenceMaxValueIncrementer;
+import org.springframework.jdbc.support.incrementer.DataFieldMaxValueIncrementer;
+
+/**
+ * {@link DataFieldMaxValueIncrementer} for MariaDB.
+ *
+ * @author Mahmoud Ben Hassine
+ * @since 5.0
+ */
+// TODO replace this with the one from Spring Framework when available
+public class MariaDBSequenceMaxValueIncrementer extends AbstractSequenceMaxValueIncrementer {
+
+	public MariaDBSequenceMaxValueIncrementer() {
+	}
+
+	public MariaDBSequenceMaxValueIncrementer(DataSource dataSource, String incrementerName) {
+		super(dataSource, incrementerName);
+	}
+
+	@Override
+	protected String getSequenceQuery() {
+		return "select next value for " + this.getIncrementerName();
+	}
+
+}

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/support/SqlPagingQueryProviderFactoryBean.java

@@ -23,6 +23,7 @@ import static org.springframework.batch.support.DatabaseType.DERBY;
 import static org.springframework.batch.support.DatabaseType.H2;
 import static org.springframework.batch.support.DatabaseType.HANA;
 import static org.springframework.batch.support.DatabaseType.HSQL;
+import static org.springframework.batch.support.DatabaseType.MARIADB;
 import static org.springframework.batch.support.DatabaseType.MYSQL;
 import static org.springframework.batch.support.DatabaseType.ORACLE;
 import static org.springframework.batch.support.DatabaseType.POSTGRES;
@@ -51,6 +52,7 @@ import org.springframework.util.StringUtils;
  *
  * @author Dave Syer
  * @author Michael Minella
+ * @author Mahmoud Ben Hassine
  */
 public class SqlPagingQueryProviderFactoryBean implements FactoryBean<PagingQueryProvider> {
 
@@ -80,6 +82,7 @@ public class SqlPagingQueryProviderFactoryBean implements FactoryBean<PagingQuer
 		providers.put(H2, new H2PagingQueryProvider());
 		providers.put(HANA, new HanaPagingQueryProvider());
 		providers.put(MYSQL, new MySqlPagingQueryProvider());
+		providers.put(MARIADB, new MariaDBPagingQueryProvider());
 		providers.put(ORACLE, new OraclePagingQueryProvider());
 		providers.put(POSTGRES, new PostgresPagingQueryProvider());
 		providers.put(SQLITE, new SqlitePagingQueryProvider());

spring-batch-infrastructure/src/main/java/org/springframework/batch/support/DatabaseType.java

@@ -31,13 +31,14 @@ import java.util.Map;
  * database driver's metadata.
  *
  * @author Lucas Ward
+ * @author Mahmoud Ben Hassine
  * @since 2.0
  */
 public enum DatabaseType {
 
 	DERBY("Apache Derby"), DB2("DB2"), DB2VSE("DB2VSE"), DB2ZOS("DB2ZOS"), DB2AS400("DB2AS400"),
 	HSQL("HSQL Database Engine"), SQLSERVER("Microsoft SQL Server"), MYSQL("MySQL"), ORACLE("Oracle"),
-	POSTGRES("PostgreSQL"), SYBASE("Sybase"), H2("H2"), SQLITE("SQLite"), HANA("HDB");
+	POSTGRES("PostgreSQL"), SYBASE("Sybase"), H2("H2"), SQLITE("SQLite"), HANA("HDB"), MARIADB("MariaDB");
 
 	private static final Map<String, DatabaseType> nameMap;
 
@@ -66,8 +67,6 @@ public enum DatabaseType {
 	 * @throws IllegalArgumentException if none is found.
 	 */
 	public static DatabaseType fromProductName(String productName) {
-		if (productName.equals("MariaDB"))
-			productName = "MySQL";
 		if (!nameMap.containsKey(productName)) {
 			throw new IllegalArgumentException("DatabaseType not found for product name: [" + productName + "]");
 		}