在MyBatis的where子句中使用类型处理程序

问题描述

在MyBatis中编写动态查询时，可以在where子句中使用类型处理程序吗?

Can I use type handler in where clause when writing dynamic query in MyBatis?

我必须将布尔值转换为char.假将转换为"N"，真将转换为"Y".由于该列中的值存储为Y或N

I have to convert the Boolean value to char. the false will be converted to "N" and true to "Y". As the value store in the column are either Y or N

推荐答案

是的，您可以使用MyBatis类型处理程序

Yes , you can use MyBatis typehandlers

public class YesNoBooleanTypeHandler extends BaseTypeHandler<Boolean> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, Boolean parameter, JdbcType jdbcType)
            throws SQLException {
        ps.setString(i, convert(parameter));
    }

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

    @Override
    public Boolean getNullableResult(ResultSet rs, int columnIndex)
            throws SQLException {
        return convert(rs.getString(columnIndex));
    }

    @Override
    public Boolean getNullableResult(CallableStatement cs, int columnIndex)
            throws SQLException {
        return convert(cs.getString(columnIndex));
    }

    private String convert(Boolean b) {
        return b ? "Y" : "N";
    }

    private Boolean convert(String s) {
        return s.equals("Y");
    }

}

Mapper.xml where子句:

Mapper.xml where clause:

... WHERE your_bool = #{yourBool,typeHandler=YesNoBooleanTypeHandler} ...

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