mooctest-user/mooctest-user-server/src/main/java/cn/iselab/mooctest/user/config/NullValueHandler.java

package cn.iselab.mooctest.user.config;

import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.TypeHandler;

import java.sql.*;

/**
 * @author sean
 * @date 2018-03-15.
 */
public class NullValueHandler implements TypeHandler<String> {

    @Override
    public String getResult(ResultSet rs, String columnName) throws SQLException {
        return rs.getString(columnName);
    }

    @Override
    public String getResult(ResultSet rs, int columnIndex) throws SQLException {
        return rs.getString(columnIndex);
    }

    @Override
    public void setParameter(PreparedStatement preparedStatement, int i, String s, JdbcType jdbcType) throws SQLException {
        if (s == null &&
                jdbcType == JdbcType.VARCHAR
//                        || jdbcType == JdbcType.TIMESTAMP || jdbcType == JdbcType.BIGINT || jdbcType == JdbcType.TINYINT || jdbcType == JdbcType.INTEGER)
                ) {
            preparedStatement.setString(i, "");
        } else {
            preparedStatement.setString(i, s);
        }
    }

    @Override
    public String getResult(CallableStatement callableStatement, int i) throws SQLException {
        return callableStatement.getString(i);
    }
}