那它能否识别PostgreSQL的数组类型并将它自动转换成Java数组类型呢？按官方的说法，既然这是默认的typeHandler，那么我们无需做任何配置mybatis会自动尝试适配，所以直接写测试代码看看：
@Test public void testFunc1() { SqlSession session = sqlSessionFactory.openSession(); try { Map<String, Object> map = new HashMap<String, Object>(); map.put("ids", new Integer[] { 101, 102, 103 }); session.update("com.wl.entity.StudentMapper.testFuncUpdate2", map); session.commit(); } catch (Exception e) { e.printStackTrace(); } finally { session.close(); } } <update id="testFuncUpdate2" statementType="CALLABLE"> {call func_arr_update (#{ids,mode=IN})} </update>如上所示，参数传的是一个Integer[]，直接运行一下junit看看测试结果：
Can’t infer the SQL type to use for an instance of [Ljava.lang.Integer;. Use setObject() with an explicit Types value to specify the type to use.
异常log如上所示，在调用AbstractJdbc2Statement类的setObject方法时抛出异常，那么再看看这个方法的源码：
/* * This stores an Object into a parameter. */ public void setObject(int parameterIndex, Object x) throws SQLException { checkClosed(); if (x == null) setNull(parameterIndex, Types.OTHER); else if (x instanceof String) setString(parameterIndex, (String)x); else if (x instanceof BigDecimal) setBigDecimal(parameterIndex, (BigDecimal)x); else if (x instanceof Short) setShort(parameterIndex, ((Short)x).shortValue()); else if (x instanceof Integer) setInt(parameterIndex, ((Integer)x).intValue()); else if (x instanceof Long) setLong(parameterIndex, ((Long)x).longValue()); else if (x instanceof Float) setFloat(parameterIndex, ((Float)x).floatValue()); else if (x instanceof Double) setDouble(parameterIndex, ((Double)x).doubleValue()); else if (x instanceof byte[]) setBytes(parameterIndex, (byte[])x); else if (x instanceof java.sql.Date) setDate(parameterIndex, (java.sql.Date)x); else if (x instanceof Time) setTime(parameterIndex, (Time)x); else if (x instanceof Timestamp) setTimestamp(parameterIndex, (Timestamp)x); else if (x instanceof Boolean) setBoolean(parameterIndex, ((Boolean)x).booleanValue()); else if (x instanceof Byte) setByte(parameterIndex, ((Byte)x).byteValue()); else if (x instanceof Blob) setBlob(parameterIndex, (Blob)x); else if (x instanceof Clob) setClob(parameterIndex, (Clob)x); else if (x instanceof Array) setArray(parameterIndex, (Array)x); else if (x instanceof PGobject) setPGobject(parameterIndex, (PGobject)x); else if (x instanceof Character) setString(parameterIndex, ((Character)x).toString()); else if (x instanceof Map) setMap(parameterIndex, (Map)x); else { // Can't infer a type. throw new PSQLException(GT.tr("Can''t infer the SQL type to use for an instance of {0}. Use setObject() with an explicit Types value to specify the type to use.", x.getClass().getName()), PSQLState.INVALID_PARAMETER_TYPE); } }