MyBatis Like查询处理%_符号

Posted 2020-08-09

如果我们数据库中存的字段包含有"%_"这两个like查询的通配符，那么在查询的时候把"%_"当作关键字是查询不出来的，因为mybatis会把这两个字符当作通配符。解决方法是要能加转义字符

1.定义一个拦截器，如果要查询的字符串中包含"%_"则增加一个转义字符

import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;

import java.util.*;

/**
 * Created by on 2016/7/1.
 */
@Intercepts({
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class,
                RowBounds.class, ResultHandler.class})})
public class QueryExecutorInterceptor implements Interceptor {
    private static final String[] NeedEscapes = new String[]{"%", "_"};
    private Properties properties;

    private static Object convertSqlEscape(Object parameter, List<String> propertyList) {
        if (propertyList != null && propertyList.size() > 0 && parameter instanceof Map) {
            Map map = (Map) parameter;
            for (Object key : map.keySet()) {
                Object value = map.get(key);
                if (value instanceof Map) {
                    map.replace(key, convertSqlEscape(value, propertyList));
                } else if (value instanceof String && propertyList.indexOf(key) > -1) {
                    String val = (String) value;
                    for (String needEscape : NeedEscapes) {
                        if (val.contains(needEscape)) {
                            val = val.replace(needEscape, "/" + needEscape);
                        }
                    }
                    map.replace(key, val);
                }
            }
        }
        return parameter;
    }

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        Object parameter = invocation.getArgs()[1];
        MappedStatement statement = (MappedStatement) invocation.getArgs()[0];
        List<ParameterMapping> parameterMappingList = statement.getBoundSql(parameter).getParameterMappings();
        List<String> propertyList = new ArrayList<>();
        if (parameterMappingList != null) {
            parameterMappingList.forEach(p -> {
                propertyList.add(p.getProperty());
            });
        }
        invocation.getArgs()[1] = convertSqlEscape(parameter, propertyList);
        return invocation.proceed();
    }

    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {
        this.properties = properties;
    }
}

2. 对面的查询mapper like后面要加escape ‘/‘

<select id="getList" resultMap="MultiResultMap" parameterType="java.util.Map">
        SELECT * FROM SYS_TEST T
        WHERE 1=1
        <if test="_parameter.containsKey(‘key‘)">
            AND UPPER(CONCAT(T.ROLE_NAME,T.ROLE_INFO)) LIKE UPPER (CONCAT(CONCAT(‘%‘, #{key, jdbcType=VARCHAR}),‘%‘)) ESCAPE ‘/‘
        </if>
    </select>

最好的做法是可以直接拦截SQL，然后在SQL后面自动加上ESCAPE ‘/‘，但还没有找到合适的方法