mybatis使用generator自己主动生成代码时的类型转换

Posted 2020-09-20 jzssuanfa

使用mybatis的generator自己主动生成代码，可是oracle数据库中number(6,2)总是自己主动转成BigDecimal。我想要转成的是float类型

这样就写了一个类型转换器，须要继承JavaTypeResolver接口

然后在mybaties配置文件generatorConfig.xml中类型转换配置位置加入上就可以

<javaTypeResolver type="com.generator.MyJavaTypeResolver">
	<property name="forceBigDecimals" value="false" />											<!-- 类型解析器 -->
</javaTypeResolver>

类型转换器MyJavaTypeResolver主要代码

public FullyQualifiedJavaType calculateJavaType(
			IntrospectedColumn introspectedColumn) {
		// TODO Auto-generated method stub
		 FullyQualifiedJavaType answer;
	        JdbcTypeInformation jdbcTypeInformation = typeMap
	                .get(introspectedColumn.getJdbcType());

	        if (jdbcTypeInformation == null) {
	            switch (introspectedColumn.getJdbcType()) {
	            case Types.DECIMAL:
	            case Types.NUMERIC:
	            	if(introspectedColumn.getScale() > 0)
	            	{//假设包括小数点则转换成float
	            		answer = new FullyQualifiedJavaType(Float.class.getName());
	            	}else{
	            		if ( introspectedColumn.getLength() > 18
	            				|| forceBigDecimals) {
	            			answer = new FullyQualifiedJavaType(BigDecimal.class
	            					.getName());
	            		} else if (introspectedColumn.getLength() > 9) {
	            			answer = new FullyQualifiedJavaType(Long.class.getName());
	            		} else if (introspectedColumn.getLength() > 4) {
	            			answer = new FullyQualifiedJavaType(Integer.class.getName());
	            		} else {
	            			answer = new FullyQualifiedJavaType(Short.class.getName());
	            		}
	            	}
	                break;

	            default:
	                answer = null;
	                break;
	            }
	        } else {
	            answer = jdbcTypeInformation.getFullyQualifiedJavaType();
	        }

	        return answer;
	}