1. logging.level.yourdaoclasspackagename=debug

2. mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

inputStream = Resources.getResourceAsStream("mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

==========================================
mybatis:
trim:
1.用于select的语句中
<trim prefix="WHERE" prefixOverrides="AND | OR">
<if test="business_no != null ">
	and business_no=#{business_no}
</if>
</trim>
2.用于insertSelective中语句中
<trim prefix="(" suffix=")" suffixOverrides=",">
			<if test="orderNo != null">
				orderNo,
			</if>
			<if test="merchantId != null">
				merchant_id,
			</if>
		</trim>
		<trim prefix="values (" suffix=")" suffixOverrides=",">
			<if test="orderNo != null">
				#{orderNo,jdbcType=VARCHAR},
			</if>
			<if test="merchantId != null">
				#{merchantId,jdbcType=VARCHAR},
			</if>

		</trim>
<set> 用于updateSelective中
update orders_inf
<set>
			<if test="merchantId != null">
				merchant_id = #{merchantId,jdbcType=VARCHAR},
			</if>
			<if test="cardNo != null">
				cardNo = #{cardNo,jdbcType=VARCHAR},
			</if>
		</set>
	where payNo = #{payNo,jdbcType=VARCHAR}

============================================================
=================================================================================
public TypeAliasRegistry() {
    registerAlias("string", String.class);

    registerAlias("byte", Byte.class);
    registerAlias("long", Long.class);
    registerAlias("short", Short.class);
    registerAlias("int", Integer.class);
    registerAlias("integer", Integer.class);
    registerAlias("double", Double.class);
    registerAlias("float", Float.class);
    registerAlias("boolean", Boolean.class);
     
    registerAlias("byte[]", Byte[].class);
    registerAlias("long[]", Long[].class);
    registerAlias("short[]", Short[].class);
    registerAlias("int[]", Integer[].class);
    registerAlias("integer[]", Integer[].class);
    registerAlias("double[]", Double[].class);
    registerAlias("float[]", Float[].class);
    registerAlias("boolean[]", Boolean[].class);
     
    registerAlias("_byte", byte.class);
    registerAlias("_long", long.class);
    registerAlias("_short", short.class);
    registerAlias("_int", int.class);
    registerAlias("_integer", int.class);
    registerAlias("_double", double.class);
    registerAlias("_float", float.class);
    registerAlias("_boolean", boolean.class);
     
    registerAlias("_byte[]", byte[].class);
    registerAlias("_long[]", long[].class);
    registerAlias("_short[]", short[].class);
    registerAlias("_int[]", int[].class);
    registerAlias("_integer[]", int[].class);
    registerAlias("_double[]", double[].class);
    registerAlias("_float[]", float[].class);
    registerAlias("_boolean[]", boolean[].class);
     
    registerAlias("date", Date.class);
    registerAlias("decimal", BigDecimal.class);
    registerAlias("bigdecimal", BigDecimal.class);
    registerAlias("biginteger", BigInteger.class);
    registerAlias("object", Object.class);
     
    registerAlias("date[]", Date[].class);
    registerAlias("decimal[]", BigDecimal[].class);
    registerAlias("bigdecimal[]", BigDecimal[].class);
    registerAlias("biginteger[]", BigInteger[].class);
    registerAlias("object[]", Object[].class);
     
    registerAlias("map", Map.class);
    registerAlias("hashmap", HashMap.class);
    registerAlias("list", List.class);
    registerAlias("arraylist", ArrayList.class);
    registerAlias("collection", Collection.class);
    registerAlias("iterator", Iterator.class);
     
    registerAlias("ResultSet", ResultSet.class);
  }
  =================================================================