Prepared DbManager for HSQLDB as alternative to mysql

src/main/java/de/kreth/dbmanager/DatabaseType.java

@@ -0,0 +1,13 @@
+package de.kreth.dbmanager;
+
+public enum DatabaseType {
+
+	MYSQL("primary key AUTO_INCREMENT"), HSQLDB("IDENTITY");
+
+	public final String autoIncrementIdType;
+
+	private DatabaseType(String autoIncrementIdType) {
+		this.autoIncrementIdType = autoIncrementIdType;
+	}
+
+}

src/main/java/de/kreth/dbmanager/DbManager.java

@@ -20,7 +20,8 @@ public class DbManager {
 	private int newVersion;
 	private List<Version> versions;
 
-	public DbManager(Collection<TableDefinition> tables, List<Version> versions, Database db, int newVersion) {
+	public DbManager(Collection<TableDefinition> tables, List<Version> versions,
+			Database db, int newVersion) {
 		tableDefinitions = new HashMap<String, TableDefinition>();
 		this.db = db;
 		this.newVersion = newVersion;
@@ -107,9 +108,11 @@ public class DbManager {
 		}
 	}
 
-	public static String createUniqueConstraint(TableDefinition def, UniqueConstraint constraint) {
+	public static String createUniqueConstraint(TableDefinition def,
+			UniqueConstraint constraint) {
 		StringBuilder sql = new StringBuilder("ALTER TABLE ");
-		sql.append(def.getTableName()).append(" ADD CONSTRAINT UNIQUE_").append(String.join("_", constraint.getNames()))
+		sql.append(def.getTableName()).append(" ADD CONSTRAINT UNIQUE_")
+				.append(String.join("_", constraint.getNames()))
 				.append(" UNIQUE (");
 		sql.append(String.join(", ", constraint.getNames())).append(")");
 		return sql.toString();
@@ -133,18 +136,14 @@ public class DbManager {
 
 			appendType(sql, col);
 
-			if (col.getColumnParameters() != null && !col.getColumnParameters().isEmpty()) {
+			if (col.getColumnParameters() != null
+					&& !col.getColumnParameters().isEmpty()) {
 				sql.append(" ").append(col.getColumnParameters());
 			}
 		}
-		for (UniqueConstraint uni : def.getUnique()) {
-
-			sql.append(",\n\tCONSTRAINT UNIQUE (");
-			sql.append(String.join(",", uni.getNames()));
-			sql.append(")");
-		}
 		sql.append("\n");
 		sql.append(")");
+
 		return sql.toString();
 	}
 
@@ -152,7 +151,8 @@ public class DbManager {
 
 		switch (col.getType()) {
 			case BLOB :
-			throw new IllegalArgumentException("Column Type " + col.getType() + " not supported");
+				throw new IllegalArgumentException(
+						"Column Type " + col.getType() + " not supported");
 			case BOOLEAN :
 				sql.append(col.getType().name());
 				break;
@@ -178,7 +178,8 @@ public class DbManager {
 		}
 	}
 
-	public static String createSqlAddColumns(TableDefinition current, ColumnDefinition... columnsToAdd) {
+	public static String createSqlAddColumns(TableDefinition current,
+			ColumnDefinition... columnsToAdd) {
 		assert (current != null);
 		StringBuilder sql = new StringBuilder();
 		sql.append("ALTER TABLE ").append(current.getTableName());
@@ -191,10 +192,12 @@ public class DbManager {
 			}
 
 			first = false;
-			sql.append("\n\tADD COLUMN ").append(col.getColumnName()).append(" ");
+			sql.append("\n\tADD COLUMN ").append(col.getColumnName())
+					.append(" ");
 			appendType(sql, col);
 
-			if (col.getColumnParameters() != null && !col.getColumnParameters().isEmpty()) {
+			if (col.getColumnParameters() != null
+					&& !col.getColumnParameters().isEmpty()) {
 				sql.append(" ").append(col.getColumnParameters());
 			}
 		}
@@ -202,7 +205,8 @@ public class DbManager {
 		return sql.toString();
 	}
 
-	public static String createSqlDropColumns(TableDefinition current, ColumnDefinition... columnsToDrop) {
+	public static String createSqlDropColumns(TableDefinition current,
+			ColumnDefinition... columnsToDrop) {
 		assert (current != null);
 
 		StringBuilder sql = new StringBuilder();

src/main/java/de/kreth/dbmanager/TableDefinition.java

@@ -1,7 +1,6 @@
 package de.kreth.dbmanager;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -16,19 +15,19 @@ import java.util.stream.Collectors;
  *
  */
 public class TableDefinition {
-	public static final String COLUMN_ID_NAME = "_id";
+	public static final String COLUMN_ID_NAME = "id";
 	private final String tableName;
 	private final Collection<ColumnDefinition> columns;
-	private Collection<UniqueConstraint> unique;
 
-	public TableDefinition(String tableName, List<ColumnDefinition> columns, UniqueConstraint... unique) {
+	public TableDefinition(String tableName, DatabaseType type,
+			List<ColumnDefinition> columns) {
 		this.tableName = tableName;
-		ColumnDefinition id = new ColumnDefinition(DataType.INTEGER, COLUMN_ID_NAME, "primary key AUTO_INCREMENT");
+		ColumnDefinition id = new ColumnDefinition(DataType.INTEGER,
+				COLUMN_ID_NAME, type.autoIncrementIdType);
 		List<ColumnDefinition> def = new ArrayList<ColumnDefinition>();
 		def.add(id);
 		def.addAll(columns);
 		this.columns = Collections.unmodifiableCollection(def);
-		this.unique = Collections.unmodifiableCollection(Arrays.asList(unique));
 	}
 
 	public String getTableName() {
@@ -39,12 +38,9 @@ public class TableDefinition {
 		return columns;
 	}
 
-	public Collection<UniqueConstraint> getUnique() {
-		return unique;
-	}
-	
 	@Override
 	public String toString() {
-		return tableName + "[" + String.join(",", columns.stream().map(m -> m.toString()).collect(Collectors.toList())) + "]";
+		return tableName + "[" + String.join(",", columns.stream()
+				.map(m -> m.toString()).collect(Collectors.toList())) + "]";
 	}
 }

src/test/java/de/kreth/dbmanager/DbManagerAddColumnTest.java

@@ -17,21 +17,28 @@ public class DbManagerAddColumnTest {
 	@Test
 	public void testAddOneColumn() {
 
-		TableDefinition def = new TableDefinition("testtable", new ArrayList<ColumnDefinition>());
+		TableDefinition def = new TableDefinition("testtable",
+				DatabaseType.MYSQL, new ArrayList<ColumnDefinition>());
 
-		String sql = DbManager.createSqlAddColumns(def, new ColumnDefinition(DataType.DATETIME, "deleted", " DEFAULT null"));
-		assertEquals("ALTER TABLE testtable\n\tADD COLUMN deleted DATETIME  DEFAULT null;", sql);
+		String sql = DbManager.createSqlAddColumns(def, new ColumnDefinition(
+				DataType.DATETIME, "deleted", " DEFAULT null"));
+		assertEquals(
+				"ALTER TABLE testtable\n\tADD COLUMN deleted DATETIME  DEFAULT null;",
+				sql);
 	}
 
 	@Test
 	public void testAddTwoColumns() {
 
-		TableDefinition def = new TableDefinition("testtable", new ArrayList<ColumnDefinition>());
+		TableDefinition def = new TableDefinition("testtable",
+				DatabaseType.MYSQL, new ArrayList<ColumnDefinition>());
 
 		List<ColumnDefinition> columns = new ArrayList<ColumnDefinition>();
-		columns.add(new ColumnDefinition(DataType.DATETIME, "deleted", " DEFAULT null"));
+		columns.add(new ColumnDefinition(DataType.DATETIME, "deleted",
+				" DEFAULT null"));
 		columns.add(new ColumnDefinition(DataType.VARCHAR25, "theType"));
-		String sql = DbManager.createSqlAddColumns(def, columns.toArray(new ColumnDefinition[]{}));
+		String sql = DbManager.createSqlAddColumns(def,
+				columns.toArray(new ColumnDefinition[]{}));
 		assertEquals(
 				"ALTER TABLE testtable\n\tADD COLUMN deleted DATETIME  DEFAULT null,\n\tADD COLUMN theType VARCHAR(25);",
 				sql);

src/test/java/de/kreth/dbmanager/DbManagerCreateTablesTest.java

@@ -1,69 +1,93 @@
 package de.kreth.dbmanager;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
 import java.util.ArrayList;
 import java.util.List;
 
 import org.junit.Before;
 import org.junit.Test;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-
 public class DbManagerCreateTablesTest {
 	@Test
 	public void testCreateSqlStatement() {
 		List<ColumnDefinition> columns = new ArrayList<ColumnDefinition>();
-        TableDefinition        def     = new TableDefinition("testtable", columns);
+		TableDefinition def = new TableDefinition("testtable",
+				DatabaseType.MYSQL, columns);
 		String sql = DbManager.createSqlStatement(def);
 
 		assertNotNull(sql);
-        assertEquals("CREATE TABLE testtable (\n" + "	_id INTEGER primary key AUTO_INCREMENT\n" + ")", sql);
+		assertEquals(
+				"CREATE TABLE testtable (\n"
+						+ "	id INTEGER primary key AUTO_INCREMENT\n" + ")",
+				sql);
 	}
 
 	@Test
 	public void testCreateTable2Columns() {
 		List<ColumnDefinition> columns = new ArrayList<ColumnDefinition>();
 
-        columns.add(new ColumnDefinition(DataType.VARCHAR100, "name", " NOT NULL"));
+		columns.add(
+				new ColumnDefinition(DataType.VARCHAR100, "name", " NOT NULL"));
 		columns.add(new ColumnDefinition(DataType.DATETIME, "theDate"));
 
-        TableDefinition def = new TableDefinition("testtable", columns);
+		TableDefinition def = new TableDefinition("testtable",
+				DatabaseType.MYSQL, columns);
 		String sql = DbManager.createSqlStatement(def);
 
 		assertNotNull(sql);
 		assertEquals("CREATE TABLE testtable (\n"
-        		+ "	_id INTEGER primary key AUTO_INCREMENT,\n"
-        		+ "	name VARCHAR(100)  NOT NULL,\n"
-        		+ "	theDate DATETIME\n" + ")",
-                     sql);
+				+ "	id INTEGER primary key AUTO_INCREMENT,\n"
+				+ "	name VARCHAR(100)  NOT NULL,\n" + "	theDate DATETIME\n"
+				+ ")", sql);
+	}
+
+	@Test
+	public void testCreateTable2ColumnsOnHsqlDb() {
+		List<ColumnDefinition> columns = new ArrayList<ColumnDefinition>();
+
+		columns.add(
+				new ColumnDefinition(DataType.VARCHAR100, "name", " NOT NULL"));
+		columns.add(new ColumnDefinition(DataType.DATETIME, "theDate"));
+
+		TableDefinition def = new TableDefinition("testtable",
+				DatabaseType.HSQLDB, columns);
+		String sql = DbManager.createSqlStatement(def);
+
+		assertNotNull(sql);
+		assertEquals("CREATE TABLE testtable (\n" + "	id INTEGER IDENTITY,\n"
+				+ "	name VARCHAR(100)  NOT NULL,\n" + "	theDate DATETIME\n"
+				+ ")", sql);
 	}
 
 	@Test
 	public void testCreateTable2ColumnsUnique() {
 		List<ColumnDefinition> columns = new ArrayList<ColumnDefinition>();
 
-        columns.add(new ColumnDefinition(DataType.VARCHAR100, "name", " NOT NULL"));
+		columns.add(
+				new ColumnDefinition(DataType.VARCHAR100, "name", " NOT NULL"));
 		columns.add(new ColumnDefinition(DataType.DATETIME, "theDate"));
 
-        UniqueConstraint unique = new UniqueConstraint(columns.get(0), columns.get(1));
-        TableDefinition def = new TableDefinition("testtable", columns, unique);
+		UniqueConstraint unique = new UniqueConstraint(columns.get(0),
+				columns.get(1));
+		TableDefinition def = new TableDefinition("testtable",
+				DatabaseType.MYSQL, columns, unique);
 		String sql = DbManager.createSqlStatement(def);
 
 		assertNotNull(sql);
 
 		String expected = "CREATE TABLE testtable (\n"
-        		+ "	_id INTEGER primary key AUTO_INCREMENT,\n"
-        		+ "	name VARCHAR(100)  NOT NULL,\n" 
-        		+ "	theDate DATETIME,\n"
-        		+ "	CONSTRAINT UNIQUE (name,theDate)\n"
-        		+ ")";
+				+ "	id INTEGER primary key AUTO_INCREMENT,\n"
+				+ "	name VARCHAR(100)  NOT NULL,\n" + "	theDate DATETIME,\n"
+				+ "	CONSTRAINT UNIQUE (name,theDate)\n" + ")";
 
 		assertEquals(expected, sql);
 	}
 
 	@Before
-    public void setUp() throws Exception {}
+	public void setUp() throws Exception {
+	}
 }
-
 
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