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1   /*
2    *    Copyright 2009-2023 the original author or authors.
3    *
4    *    Licensed under the Apache License, Version 2.0 (the "License");
5    *    you may not use this file except in compliance with the License.
6    *    You may obtain a copy of the License at
7    *
8    *       https://www.apache.org/licenses/LICENSE-2.0
9    *
10   *    Unless required by applicable law or agreed to in writing, software
11   *    distributed under the License is distributed on an "AS IS" BASIS,
12   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *    See the License for the specific language governing permissions and
14   *    limitations under the License.
15   */
16  package org.apache.ibatis.type;
17  
18  import java.io.StringReader;
19  import java.sql.CallableStatement;
20  import java.sql.Clob;
21  import java.sql.PreparedStatement;
22  import java.sql.ResultSet;
23  import java.sql.SQLException;
24  
25  /**
26   * @author Clinton Begin
27   */
28  public class ClobTypeHandler extends BaseTypeHandler<String> {
29  
30    @Override
31    public void setNonNullParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType)
32        throws SQLException {
33      StringReader reader = new StringReader(parameter);
34      ps.setCharacterStream(i, reader, parameter.length());
35    }
36  
37    @Override
38    public String getNullableResult(ResultSet rs, String columnName) throws SQLException {
39      Clob clob = rs.getClob(columnName);
40      return toString(clob);
41    }
42  
43    @Override
44    public String getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
45      Clob clob = rs.getClob(columnIndex);
46      return toString(clob);
47    }
48  
49    @Override
50    public String getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
51      Clob clob = cs.getClob(columnIndex);
52      return toString(clob);
53    }
54  
55    private String toString(Clob clob) throws SQLException {
56      return clob == null ? null : clob.getSubString(1, (int) clob.length());
57    }
58  
59  }