1 files changed, 151 insertions, 0 deletions
diff --git a/src/com/iciql/SQLDialectDerby.java b/src/com/iciql/SQLDialectDerby.java
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index 0000000..42f8cfd
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+++ b/src/com/iciql/SQLDialectDerby.java
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+/*
+ * Copyright 2011 James Moger.
+ *
+ * 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 com.iciql;
+
+import java.text.MessageFormat;
+
+import com.iciql.TableDefinition.FieldDefinition;
+import com.iciql.TableDefinition.IndexDefinition;
+import com.iciql.util.StatementBuilder;
+
+/**
+ * Derby database dialect.
+ */
+public class SQLDialectDerby extends SQLDialectDefault {
+
+	@Override
+	public Class<? extends java.util.Date> getDateTimeClass() {
+		return java.sql.Timestamp.class;
+	}
+
+	@Override
+	protected String convertSqlType(String sqlType) {
+		if ("TINYINT".equals(sqlType)) {
+			// Derby does not have a TINYINT/BYTE type
+			return "SMALLINT";
+		}
+		return sqlType;
+	}
+
+	@Override
+	public boolean supportsMemoryTables() {
+		return false;
+	}
+
+	@Override
+	public boolean supportsIfNotExists() {
+		return false;
+	}
+
+	@Override
+	public boolean supportsLimitOffset() {
+		// FETCH/OFFSET added in 10.5
+		return databaseVersion >= 10.5f;
+	}
+
+	@Override
+	public void appendLimitOffset(SQLStatement stat, long limit, long offset) {
+		if (offset > 0) {
+			stat.appendSQL(" OFFSET " + offset + (offset == 1 ? " ROW" : " ROWS"));
+		}
+		if (limit > 0) {
+			stat.appendSQL(" FETCH NEXT " + limit + (limit == 1 ? " ROW" : " ROWS") + " ONLY");
+		}
+	}
+
+	@Override
+	public String prepareColumnName(String name) {
+		return name;
+	}
+
+	@Override
+	protected boolean prepareColumnDefinition(StatementBuilder buff, boolean isAutoIncrement,
+			boolean isPrimaryKey) {
+		if (isAutoIncrement) {
+			buff.append(" GENERATED BY DEFAULT AS IDENTITY");
+		}
+		return false;
+	}
+
+	@Override
+	public void prepareCreateIndex(SQLStatement stat, String schema, String table, IndexDefinition index) {
+		StatementBuilder buff = new StatementBuilder();
+		buff.append("CREATE ");
+		switch (index.type) {
+		case UNIQUE:
+			buff.append("UNIQUE ");
+			break;
+		case UNIQUE_HASH:
+			buff.append("UNIQUE ");
+			break;
+		}
+		buff.append("INDEX ");
+		buff.append(index.indexName);
+		buff.append(" ON ");
+		buff.append(table);
+		buff.append("(");
+		for (String col : index.columnNames) {
+			buff.appendExceptFirst(", ");
+			buff.append(prepareColumnName(col));
+		}
+		buff.append(") ");
+
+		stat.setSQL(buff.toString().trim());
+	}
+
+	/**
+	 * Derby does not support the SQL2003 MERGE syntax, but we can use a trick
+	 * to insert a row if it does not exist and call update() in Db.merge() if
+	 * the affected row count is 0;
+	 * 
+	 * http://stackoverflow.com/questions/407688
+	 */
+	@Override
+	public <T> void prepareMerge(SQLStatement stat, String schemaName, String tableName,
+			TableDefinition<T> def, Object obj) {
+		StatementBuilder buff = new StatementBuilder("INSERT INTO ");
+		buff.append(prepareTableName(schemaName, tableName));
+		buff.append(" (");
+		buff.resetCount();
+		for (FieldDefinition field : def.fields) {
+			buff.appendExceptFirst(", ");
+			buff.append(prepareColumnName(field.columnName));
+		}
+		buff.append(") (SELECT ");
+		buff.resetCount();
+		for (FieldDefinition field : def.fields) {
+			buff.appendExceptFirst(", ");
+			buff.append('?');
+			Object value = def.getValue(obj, field);
+			stat.addParameter(value);
+		}
+		buff.append(" FROM ");
+		buff.append(prepareTableName(schemaName, tableName));
+		buff.append(" WHERE ");
+		buff.resetCount();
+		for (FieldDefinition field : def.fields) {
+			if (field.isPrimaryKey) {
+				buff.appendExceptFirst(" AND ");
+				buff.append(MessageFormat.format("{0} = ?", prepareColumnName(field.columnName)));
+				Object value = def.getValue(obj, field);
+				stat.addParameter(value);
+			}
+		}
+		buff.append(" HAVING count(*)=0)");
+		stat.setSQL(buff.toString());
+	}
+}
+\ No newline at end of file