mybatis if test条件判断语句中的判断问题分析

<if test="facilityOccupied != null and facilityOccupied != '' and facilityOccupied == 1 ">
                and z.serviceCount = 1
            </if>    
            <if test="facilityOccupied != null and facilityOccupied != '' and facilityOccupied == 0 ">
                and z.serviceCount = 0
            </if>

<if test="facilityOccupied != null and facilityOccupied != '' and facilityOccupied.equals(1)">
                and z.serviceCount = 1
            </if>    
            <if test="facilityOccupied != null and facilityOccupied != '' and facilityOccupied.equals(0)">
                and z.serviceCount = 0
            </if>

<insert id="insertDelivery" parameterType="com.zuci.request.DeliveryPreferenceReq">     
    insert cx_customer_deliverypreference     
    <trim prefix="(" suffix=")" suffixOverrides=",">           
        .... 此处省略       
        <if test="takeWay == '1' and workday != null ">         
            WORKDAY,       
        </if>       
        ....     
    </trim>
         
    <trim prefix="values (" suffix=")" suffixOverrides=",">          
        .... 此处省略          
        <if test="takeWay == '1' and workday != null ">            
            #{workday, jdbcType=VARCHAR},     
        </if>      
        ....   
    </trim>
</insert>

<if test="messageType == 'senderReceiveSuccess' ">
      ......
</if>

private Integer status;//状态，可能为0、1、2、3。

<sql>
  <trim prefix="where" prefixOverrides="and | or ">
      //...省略其他
      <if test="status != null and status !=''">and status = #{status}</if> 
  <trim prefix="where" prefixOverrides="and | or ">
</sql>

<if test="status != null">and status = #{status}</if> 

public class IfSqlNode implements SqlNode {
  private ExpressionEvaluator evaluator;
  private String test;
  private SqlNode contents;
  public IfSqlNode(SqlNode contents, String test) {
    this.test = test;
    this.contents = contents;
    this.evaluator = new ExpressionEvaluator();
  }
  public boolean apply(DynamicContext context) {
    if (evaluator.evaluateBoolean(test, context.getBindings())) {
      contents.apply(context);
      return true;
    }
    return false;
  }
}

public class ExpressionEvaluator {  
  public boolean evaluateBoolean(String expression, Object parameterObject) {  
    Object value = OgnlCache.getValue(expression, parameterObject);  
    if (value instanceof Boolean) return (Boolean) value;  
    if (value instanceof Number) return !new BigDecimal(String.valueOf(value)).equals(BigDecimal.ZERO);  
    return value != null;  
  }  

public class OgnlCache {
  private static final Map<String, ognl.Node> expressionCache = new ConcurrentHashMap<String, ognl.Node>();
  public static Object getValue(String expression, Object root) throws OgnlException {
    return Ognl.getValue(parseExpression(expression), root);
  }
  private static Object parseExpression(String expression) throws OgnlException {
    try {
      Node node = expressionCache.get(expression);
      if (node == null) {
        node = new OgnlParser(new StringReader(expression)).topLevelExpression();
        expressionCache.put(expression, node);
      }
      return node;
    } catch (ParseException e) {
      throw new ExpressionSyntaxException(expression, e);
    } catch (TokenMgrError e) {
      throw new ExpressionSyntaxException(expression, e);
    }
  }