Add SAP HANA support (#1511)

src/main/java/io/ebeaninternal/server/core/DatabasePlatformFactory.java

@@ -5,6 +5,7 @@ import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebean.config.dbplatform.cockroach.CockroachPlatform;
 import io.ebean.config.dbplatform.db2.DB2Platform;
 import io.ebean.config.dbplatform.h2.H2Platform;
+import io.ebean.config.dbplatform.hana.HanaPlatform;
 import io.ebean.config.dbplatform.hsqldb.HsqldbPlatform;
 import io.ebean.config.dbplatform.mysql.MySqlPlatform;
 import io.ebean.config.dbplatform.oracle.OraclePlatform;
@@ -106,6 +107,9 @@ public class DatabasePlatformFactory {
     if (dbName.equals("sqlite")) {
       return new SQLitePlatform();
     }
+    if (dbName.equals("hana")) {
+      return new HanaPlatform();
+    }
 
     throw new RuntimeException("database platform " + dbName + " is not known?");
   }
@@ -156,6 +160,8 @@ public class DatabasePlatformFactory {
       return new DB2Platform();
     } else if (dbProductName.contains("sql anywhere")) {
       return new SqlAnywherePlatform();
+    }else if (dbProductName.contains("hdb")) {
+      return new HanaPlatform();
     }
 
     // use the standard one

src/main/java/io/ebeaninternal/server/core/PlatformDdlBuilder.java

@@ -4,6 +4,7 @@ import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.CockroachDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.DB2Ddl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.H2Ddl;
+import io.ebeaninternal.dbmigration.ddlgeneration.platform.HanaColumnStoreDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.HsqldbDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.MySqlDdl;
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.Oracle10Ddl;
@@ -47,6 +48,8 @@ public class PlatformDdlBuilder {
       case SQLSERVER17:
       case SQLSERVER:
         return new SqlServerDdl(platform);
+      case HANA:
+        return new HanaColumnStoreDdl(platform);
       default:
         return new PlatformDdl(platform);
     }

src/main/java/io/ebeaninternal/server/expression/platform/DbExpressionHandlerFactory.java

@@ -25,6 +25,8 @@ public class DbExpressionHandlerFactory {
       case SQLSERVER17:
       case SQLSERVER:
         return new SqlServerDbExpression();
+      case HANA:
+        return new HanaDbExpression();
       default:
         return new BasicDbExpression();
     }

src/main/java/io/ebeaninternal/server/expression/platform/HanaDbExpression.java

@@ -0,0 +1,60 @@
+package io.ebeaninternal.server.expression.platform;
+
+import io.ebeaninternal.api.SpiExpressionRequest;
+import io.ebeaninternal.server.expression.BitwiseOp;
+import io.ebeaninternal.server.expression.Op;
+
+/**
+ * HANA handling of platform specific expressions.
+ */
+public class HanaDbExpression extends BaseDbExpression {
+
+  @Override
+  public void bitwise(SpiExpressionRequest request, String propName, BitwiseOp operator, long flags, String compare,
+      long match) {
+    bitwiseFunction(request, propName, operator, compare);
+  }
+
+  @Override
+  public void json(SpiExpressionRequest request, String propName, String path, Op operator, Object value) {
+    request.append("json_value(").append(propName).append(", '$.").append(path).append("')");
+    request.append(operator.bind());
+  }
+
+  @Override
+  public void arrayIsEmpty(SpiExpressionRequest request, String propName, boolean empty) {
+    request.append("cardinality(").append(propName).append(")");
+    if (empty) {
+      request.append(" = 0");
+    } else {
+      request.append(" <> 0");
+    }
+  }
+
+  @Override
+  public String concat(String property0, String separator, String property1, String suffix) {
+    StringBuilder sb = new StringBuilder();
+    sb.append("concat(").append(property0).append(", '").append(separator).append("'||").append(property1);
+    if (suffix != null && !suffix.isEmpty()) {
+      sb.append("||'").append(suffix).append('\'');
+    }
+    sb.append(")");
+    return sb.toString();
+  }
+
+  @Override
+  public void arrayContains(SpiExpressionRequest request, String propName, boolean contains, Object... values) {
+    for (int i = 0; i < values.length; i++) {
+      if (i > 0) {
+        request.append(" and ");
+      }
+      request.append("(?");
+      if (!contains) {
+        request.append(" not ");
+      }
+      request.append(" member of ").append(propName).append(")");
+
+    }
+  }
+
+}

src/main/java/io/ebeaninternal/server/query/CQueryBuilder.java

@@ -426,7 +426,7 @@ class CQueryBuilder {
     try {
       // For SqlServer we need either "selectMethod=cursor" in the connection string or fetch explicitly a cursorable
       // statement here by specifying ResultSet.CONCUR_UPDATABLE
-      PreparedStatement statement = connection.prepareStatement(sql,ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE);
+      PreparedStatement statement = connection.prepareStatement(sql,ResultSet.TYPE_FORWARD_ONLY, dbPlatform.isSupportsResultSetConcurrencyModeUpdatable() ? ResultSet.CONCUR_UPDATABLE : ResultSet.CONCUR_READ_ONLY);
       predicates.bind(statement, connection);
 
       ResultSet resultSet = statement.executeQuery();