MyBatis实现模糊查询的几种方式

 
  SELECT * FROM test_student
  
   
    age
    ${compare}
    #{age}
   
   
    AND name LIKE '%#{name}%'
   
   
    AND address LIKE '%#{address}%'
   
  
  ORDER BY id
 

  SELECT * FROM test_student
  
   
    age
    ${compare}
    #{age}
   
   
    AND name LIKE '%${name}%'
   
   
    AND address LIKE '%${address}%'
   
  
  ORDER BY id
 

 
  SELECT * FROM test_student
  
   
    age
    ${compare}
    #{age}
   
   
    AND name LIKE "%"#{name}"%"
   
   
    AND address LIKE "%"#{address}"%"
   
  
  ORDER BY id
 

  SELECT * FROM test_student
  
   
    age
    ${compare}
    #{age}
   
   
    AND name LIKE CONCAT(CONCAT('%',#{name},'%'))
   
   
    AND address LIKE CONCAT(CONCAT('%',#{address},'%'))
   
  
  ORDER BY id
 

  
  
  SELECT * FROM test_student
  
   
    age
    ${compare}
    #{age}
   
   
    AND name LIKE #{pattern1}
   
   
    AND address LIKE #{pattern2}
   
  
  ORDER BY id
 

public static void main(String[] args) {
  try {
   int count = 500;

   long begin = System.currentTimeMillis();
   testString(count);
   long end = System.currentTimeMillis();
   long time = end - begin;
   System.out.println("String 方法拼接"+count+"次消耗时间：" + time + "毫秒");

   begin = System.currentTimeMillis();
   testStringBuilder(count);
   end = System.currentTimeMillis();
   time = end - begin;
   System.out.println("StringBuilder 方法拼接"+count+"次消耗时间：" + time + "毫秒");

  } catch (Exception e) {
   e.printStackTrace();
  }

 }

 private static String testString(int count) {
  String result = "";

  for (int i = 0; i < count; i++) {
   result += "hello ";
  }

  return result;
 }

 private static String testStringBuilder(int count) {
  StringBuilder sb = new StringBuilder();

  for (int i = 0; i < count; i++) {
   sb.append("hello");
  }

  return sb.toString();
 }