Mybatis中的核心配置文件SqlMapConf.xml的配置规则

绝地灬酷狼 2022-12-09 05:20 135阅读 0赞

#### Mybatis中的核心配置文件SqlMapConf.xml的配置规则 ####

SqlMapConf.xml的文件引用的约束是dtd，必须按照顺序编写配置：

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1、属性配置 properties

（1）先在外部编写一个jdbc连接的基本信息：

jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8
    jdbc.username=root
    jdbc.password=123456

（2）在核心配置文件中引用属性文件

<properties resource="jdbc.properties">
    	<property name="jdbc.username" value="root1"/>
    	<property name="jdbc.password" value="123456"/>
    </properties>

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2、别名配置 typeAliases

（1）mybatis中默认的别名都在TypeAliasRegistry这个类中定义着：

public class TypeAliasRegistry { 
        private final Map<String, Class<?>> TYPE_ALIASES = new HashMap();
    
        public TypeAliasRegistry() { 
            this.registerAlias("string", String.class);
            this.registerAlias("byte", Byte.class);
            this.registerAlias("long", Long.class);
            this.registerAlias("short", Short.class);
            this.registerAlias("int", Integer.class);
            this.registerAlias("integer", Integer.class);
            this.registerAlias("double", Double.class);
            this.registerAlias("float", Float.class);
            this.registerAlias("boolean", Boolean.class);
            
            this.registerAlias("byte[]", Byte[].class);
            this.registerAlias("long[]", Long[].class);
            this.registerAlias("short[]", Short[].class);
            this.registerAlias("int[]", Integer[].class);
            this.registerAlias("integer[]", Integer[].class);
            this.registerAlias("double[]", Double[].class);
            this.registerAlias("float[]", Float[].class);
            this.registerAlias("boolean[]", Boolean[].class);
            
            this.registerAlias("_byte", Byte.TYPE);
            this.registerAlias("_long", Long.TYPE);
            this.registerAlias("_short", Short.TYPE);
            this.registerAlias("_int", Integer.TYPE);
            this.registerAlias("_integer", Integer.TYPE);
            this.registerAlias("_double", Double.TYPE);
            this.registerAlias("_float", Float.TYPE);
            this.registerAlias("_boolean", Boolean.TYPE);
            
            this.registerAlias("_byte[]", byte[].class);
            this.registerAlias("_long[]", long[].class);
            this.registerAlias("_short[]", short[].class);
            this.registerAlias("_int[]", int[].class);
            this.registerAlias("_integer[]", int[].class);
            this.registerAlias("_double[]", double[].class);
            this.registerAlias("_float[]", float[].class);
            this.registerAlias("_boolean[]", boolean[].class);
            
            this.registerAlias("date", Date.class);
            this.registerAlias("decimal", BigDecimal.class);
            this.registerAlias("bigdecimal", BigDecimal.class);
            this.registerAlias("biginteger", BigInteger.class);
            this.registerAlias("object", Object.class);
            
            this.registerAlias("date[]", Date[].class);
            this.registerAlias("decimal[]", BigDecimal[].class);
            this.registerAlias("bigdecimal[]", BigDecimal[].class);
            this.registerAlias("biginteger[]", BigInteger[].class);
            this.registerAlias("object[]", Object[].class);
            
            this.registerAlias("map", Map.class);
            this.registerAlias("hashmap", HashMap.class);
            this.registerAlias("list", List.class);
            this.registerAlias("arraylist", ArrayList.class);
            this.registerAlias("collection", Collection.class);
            this.registerAlias("iterator", Iterator.class);
            this.registerAlias("ResultSet", ResultSet.class);
        }
    	// 类中还有一些其他的方法
    }

（2）在核心配置文件中自定义别名

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3、映射文件的加载 mappers

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