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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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