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  • mybatis杂记

    mybatis学习官网:

    1、如果项目中使用maven管理,又引用 了mybatis框架,

         下面是mybatis官网给出的 mybatis在maven中央仓库的坐标原文

    详情见连接:https://code.google.com/p/mybatis/wiki/DocMavenTutorial

    MyBatis & Maven

    The following is the Maven group, artifact and version for MyBatis.

      <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.1.1</version>
      </dependency>

    If you are looking to try the latest and greatest you can use our snapshot repository. Just add the following to your project's pom.xml or to a profile defined in your settings.xml.

    <repository>
        <id>mybatis-snapshot</id>
        <name>MyBatis Snapshot Repository</name>
        <url>https://oss.sonatype.org/content/repositories/snapshots</url></repository>

    2、What is the difference between #{...} and ${...}?

    MyBatis interprets #{...} as a parameter marker in a JDBC prepared statement. MyBatis interprets ${...} as string substitution. It is important to know the difference because parameter markers cannot be used in certain places in SQL statements. For example, you cannot use a parameter marker to specify a table name. Given the following code:

    Map<String,Object> parms =newHashMap<String,Object>();
    parms.put("table","foo");
    parms.put("criteria",37);List<Object> rows = mapper.generalSelect(parms);
    <selectid="generalSelect"parameterType="map">
      select * from ${table} where col1 = #{criteria}
    </select>

    MyBatis will generate the following prepared statement:

    select*from foo where col1 =?

    Important: note that use of ${...} (string substitution) presents a risk for SQL injection attacks. Also, string substitution can be problematical for complex types like dates. For these reasons, we recommend using the #{...} form whenever possible.


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  • 原文地址:https://www.cnblogs.com/riskyer/p/3226188.html
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