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- /*
- * Copyright 2004-2011 H2 Group.
- * 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.sql.DatabaseMetaData;
- import java.sql.SQLException;
-
- import com.iciql.TableDefinition.FieldDefinition;
- import com.iciql.TableDefinition.IndexDefinition;
- import com.iciql.util.StatementBuilder;
- import com.iciql.util.StringUtils;
-
- /**
- * Default implementation of an SQL dialect. Does not support merge nor index
- * creation.
- */
- public class SQLDialectDefault implements SQLDialect {
- float databaseVersion;
- String databaseName;
- String productVersion;
-
- @Override
- public String toString() {
- return getClass().getName() + ": " + databaseName + " " + productVersion;
- }
-
- @Override
- public void configureDialect(String databaseName, DatabaseMetaData data) {
- this.databaseName = databaseName;
- try {
- databaseVersion = Float.parseFloat(data.getDatabaseMajorVersion() + "."
- + data.getDatabaseMinorVersion());
- productVersion = data.getDatabaseProductVersion();
- } catch (SQLException e) {
- throw new IciqlException(e);
- }
- }
-
- /**
- * Allows subclasses to change the type of a column for a CREATE statement.
- *
- * @param sqlType
- * @return the SQL type or a preferred alternative
- */
- protected String convertSqlType(String sqlType) {
- return sqlType;
- }
-
- @Override
- public Class<? extends java.util.Date> getDateTimeClass() {
- return java.util.Date.class;
- }
-
- @Override
- public boolean supportsMemoryTables() {
- return false;
- }
-
- @Override
- public boolean supportsIfNotExists() {
- return true;
- }
-
- @Override
- public boolean supportsLimitOffset() {
- return true;
- }
-
- @Override
- public String prepareTableName(String schemaName, String tableName) {
- if (StringUtils.isNullOrEmpty(schemaName)) {
- return tableName;
- }
- return schemaName + "." + tableName;
- }
-
- @Override
- public String prepareColumnName(String name) {
- return name;
- }
-
- @Override
- public <T> void prepareCreateTable(SQLStatement stat, TableDefinition<T> def) {
- StatementBuilder buff;
- if (def.memoryTable && supportsMemoryTables()) {
- buff = new StatementBuilder("CREATE MEMORY TABLE ");
- } else {
- buff = new StatementBuilder("CREATE TABLE ");
- }
-
- if (supportsIfNotExists()) {
- buff.append("IF NOT EXISTS ");
- }
-
- buff.append(prepareTableName(def.schemaName, def.tableName)).append('(');
-
- boolean hasIdentityColumn = false;
- for (FieldDefinition field : def.fields) {
- buff.appendExceptFirst(", ");
- buff.append(prepareColumnName(field.columnName)).append(' ');
- String dataType = field.dataType;
- if (dataType.equals("VARCHAR")) {
- // check to see if we should use VARCHAR or CLOB
- if (field.length <= 0) {
- dataType = "CLOB";
- }
- buff.append(convertSqlType(dataType));
- if (field.length > 0) {
- buff.append('(').append(field.length).append(')');
- }
- } else if (dataType.equals("DECIMAL")) {
- // DECIMAL(precision,scale)
- buff.append(convertSqlType(dataType));
- if (field.length > 0) {
- buff.append('(').append(field.length);
- if (field.scale > 0) {
- buff.append(',').append(field.scale);
- }
- buff.append(')');
- }
- } else {
- // other
- buff.append(convertSqlType(dataType));
- }
-
- hasIdentityColumn |= prepareColumnDefinition(buff, field.isAutoIncrement, field.isPrimaryKey);
-
- if (!field.nullable) {
- buff.append(" NOT NULL");
- }
-
- // default values
- if (!field.isAutoIncrement && !field.isPrimaryKey) {
- String dv = field.defaultValue;
- if (!StringUtils.isNullOrEmpty(dv)) {
- if (ModelUtils.isProperlyFormattedDefaultValue(dv)
- && ModelUtils.isValidDefaultValue(field.field.getType(), dv)) {
- buff.append(" DEFAULT " + dv);
- }
- }
- }
- }
-
- // if table does not have identity column then specify primary key
- if (!hasIdentityColumn) {
- if (def.primaryKeyColumnNames != null && def.primaryKeyColumnNames.size() > 0) {
- buff.append(", PRIMARY KEY(");
- buff.resetCount();
- for (String n : def.primaryKeyColumnNames) {
- buff.appendExceptFirst(", ");
- buff.append(prepareColumnName(n));
- }
- buff.append(')');
- }
- }
- buff.append(')');
- stat.setSQL(buff.toString());
- }
-
- protected boolean prepareColumnDefinition(StatementBuilder buff, boolean isAutoIncrement,
- boolean isPrimaryKey) {
- boolean isIdentity = false;
- if (isAutoIncrement && isPrimaryKey) {
- buff.append(" IDENTITY");
- isIdentity = true;
- } else if (isAutoIncrement) {
- buff.append(" AUTO_INCREMENT");
- }
- return isIdentity;
- }
-
- @Override
- public void prepareCreateIndex(SQLStatement stat, String schemaName, String tableName,
- IndexDefinition index) {
- throw new IciqlException("{0} does not support index creation!", getClass().getSimpleName());
- }
-
- @Override
- public <T> void prepareMerge(SQLStatement stat, String schemaName, String tableName,
- TableDefinition<T> def, Object obj) {
- throw new IciqlException("{0} does not support merge statements!", getClass().getSimpleName());
- }
-
- @Override
- public void appendLimitOffset(SQLStatement stat, long limit, long offset) {
- if (limit > 0) {
- stat.appendSQL(" LIMIT " + limit);
- }
- if (offset > 0) {
- stat.appendSQL(" OFFSET " + offset);
- }
- }
- }
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