How does Mybatis judge the length of a string?

2 years ago
Ava Mitchell
1 minute

Mybatis does not provide a direct way to determine the length of a string, but it can be achieved by using Mybatis’ OGNL expression and Java’s string methods.

  1. Using OGNL expression in Mybatis mapper file to get the length of a string. Assume there is a string parameter named ‘name’.
<if test="name != null and name.length() > 0">
    <!-- Your logic here -->
</if>

In the above code, an OGNL expression is used to check if the name is not null and has a length greater than 0.

  1. size()
String name = "Mybatis";
if (name != null && name.length() > 0) {
    // Your logic here
}

In the above code, check if the name is not null and has a length greater than 0.

It is important to note that if the string is null, calling the length() method will throw a NullPointerException, so it is best to check if the string is null before determining its length.

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