Add MariaDB Connector/J JDBC driver (#2391)

Author: Torch3333

.github/workflows/ci.yaml

@@ -1436,7 +1436,7 @@ jobs:
         uses: gradle/actions/setup-gradle@v4
 
       - name: Execute Gradle 'integrationTestJdbc' task
-        run: ./gradlew integrationTestJdbc ${{ matrix.mode.group_commit_enabled && env.INT_TEST_GRADLE_OPTIONS_FOR_GROUP_COMMIT || '' }}
+        run: ./gradlew integrationTestJdbc -Dscalardb.jdbc.url=jdbc:mariadb://localhost:3306 ${{ matrix.mode.group_commit_enabled && env.INT_TEST_GRADLE_OPTIONS_FOR_GROUP_COMMIT || '' }}
 
       - name: Upload Gradle test reports
         if: always()
@@ -1496,7 +1496,7 @@ jobs:
         uses: gradle/actions/setup-gradle@v4
 
       - name: Execute Gradle 'integrationTestJdbc' task
-        run: ./gradlew integrationTestJdbc ${{ matrix.mode.group_commit_enabled && env.INT_TEST_GRADLE_OPTIONS_FOR_GROUP_COMMIT || '' }}
+        run: ./gradlew integrationTestJdbc -Dscalardb.jdbc.url=jdbc:mariadb://localhost:3306 ${{ matrix.mode.group_commit_enabled && env.INT_TEST_GRADLE_OPTIONS_FOR_GROUP_COMMIT || '' }}
 
       - name: Upload Gradle test reports
         if: always()

build.gradle

@@ -35,6 +35,7 @@ subprojects {
         sqlserverDriverVersion = '11.2.3.jre8'
         sqliteDriverVersion = '3.47.1.0'
         yugabyteDriverVersion = '42.7.3-yb-2'
+        mariadDbDriverVersion = '3.5.1'
         picocliVersion = '4.7.6'
         commonsTextVersion = '1.13.0'
         junitVersion = '5.11.4'

core/build.gradle

@@ -107,6 +107,7 @@ dependencies {
     implementation "com.microsoft.sqlserver:mssql-jdbc:${sqlserverDriverVersion}"
     implementation "org.xerial:sqlite-jdbc:${sqliteDriverVersion}"
     implementation "com.yugabyte:jdbc-yugabytedb:${yugabyteDriverVersion}"
+    implementation "org.mariadb.jdbc:mariadb-java-client:${mariadDbDriverVersion}"
     implementation "org.apache.commons:commons-text:${commonsTextVersion}"
     testImplementation "org.junit.jupiter:junit-jupiter-api:${junitVersion}"
     testImplementation "org.junit.jupiter:junit-jupiter-params:${junitVersion}"

core/src/main/java/com/scalar/db/storage/jdbc/RdbEngineFactory.java

@@ -23,6 +23,8 @@ public static RdbEngineStrategy create(JdbcConfig config) {
       return new RdbEngineSqlite();
     } else if (jdbcUrl.startsWith("jdbc:yugabytedb:")) {
       return new RdbEngineYugabyte();
+    } else if (jdbcUrl.startsWith("jdbc:mariadb:")) {
+      return new RdbEngineMariaDB();
     } else {
       throw new IllegalArgumentException(
           CoreError.JDBC_RDB_ENGINE_NOT_SUPPORTED.buildMessage(jdbcUrl));

core/src/main/java/com/scalar/db/storage/jdbc/RdbEngineMariaDB.java

@@ -0,0 +1,24 @@
+package com.scalar.db.storage.jdbc;
+
+import com.scalar.db.io.DataType;
+import java.sql.Driver;
+import java.sql.JDBCType;
+
+class RdbEngineMariaDB extends RdbEngineMysql {
+  @Override
+  public Driver getDriver() {
+    return new org.mariadb.jdbc.Driver();
+  }
+
+  @Override
+  public DataType getDataTypeForScalarDb(
+      JDBCType type, String typeName, int columnSize, int digits, String columnDescription) {
+    if (type == JDBCType.BOOLEAN) {
+      // MariaDB JDBC driver maps TINYINT(1) type as a BOOLEAN JDBC type which differs from the
+      // MySQL driver which maps it to a BIT type.
+      return DataType.BOOLEAN;
+    } else {
+      return super.getDataTypeForScalarDb(type, typeName, columnSize, digits, columnDescription);
+    }
+  }
+}