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An JDBC datasource implementation.
/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* 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.alibaba.druid.proxy.jdbc;
import java.sql.Types;
import java.util.Calendar;
public final class JdbcParameterNull implements JdbcParameter {
private final int sqlType;
public final static JdbcParameterNull CHAR = new JdbcParameterNull(Types.CHAR);
public final static JdbcParameterNull VARCHAR = new JdbcParameterNull(Types.VARCHAR);
public final static JdbcParameterNull NVARCHAR = new JdbcParameterNull(Types.NVARCHAR);
public final static JdbcParameterNull BINARY = new JdbcParameterNull(Types.BINARY);
public final static JdbcParameterNull VARBINARY = new JdbcParameterNull(Types.VARBINARY);
public final static JdbcParameterNull TINYINT = new JdbcParameterNull(Types.TINYINT);
public final static JdbcParameterNull SMALLINT = new JdbcParameterNull(Types.SMALLINT);
public final static JdbcParameterNull INTEGER = new JdbcParameterNull(Types.INTEGER);
public final static JdbcParameterNull BIGINT = new JdbcParameterNull(Types.BIGINT);
public final static JdbcParameterNull DECIMAL = new JdbcParameterNull(Types.DECIMAL);
public final static JdbcParameterNull NUMERIC = new JdbcParameterNull(Types.NUMERIC);
public final static JdbcParameterNull FLOAT = new JdbcParameterNull(Types.FLOAT);
public final static JdbcParameterNull DOUBLE = new JdbcParameterNull(Types.DOUBLE);
public final static JdbcParameterNull NULL = new JdbcParameterNull(Types.NULL);
public final static JdbcParameterNull DATE = new JdbcParameterNull(Types.DATE);
public final static JdbcParameterNull TIME = new JdbcParameterNull(Types.TIME);
public final static JdbcParameterNull TIMESTAMP = new JdbcParameterNull(Types.TIMESTAMP);
private JdbcParameterNull(int sqlType){
this.sqlType = sqlType;
}
@Override
public Object getValue() {
return null;
}
@Override
public long getLength() {
return 0;
}
@Override
public Calendar getCalendar() {
return null;
}
@Override
public int getSqlType() {
return sqlType;
}
public static JdbcParameterNull valueOf(int sqlType) {
switch (sqlType) {
case Types.TINYINT:
return INTEGER;
case Types.SMALLINT:
return SMALLINT;
case Types.INTEGER:
return INTEGER;
case Types.BIGINT:
return BIGINT;
case Types.DECIMAL:
return DECIMAL;
case Types.NUMERIC:
return NUMERIC;
case Types.FLOAT:
return FLOAT;
case Types.DOUBLE:
return DOUBLE;
case Types.CHAR:
return CHAR;
case Types.VARCHAR:
return VARCHAR;
case Types.NVARCHAR:
return NVARCHAR;
case Types.BINARY:
return BINARY;
case Types.VARBINARY:
return VARBINARY;
case Types.TIME:
return TIME;
case Types.DATE:
return DATE;
case Types.TIMESTAMP:
return TIMESTAMP;
case Types.NULL:
return NULL;
default:
return new JdbcParameterNull(sqlType);
}
}
}
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