Appearance
mybatis使用
This page demonstrates some of the built-in markdown extensions provided by VitePress.
pom.xml
md
```xml
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.10</version>
</dependency>
```
yml
md
```yml
mybatis:
mapper-locations: classpath:xmls/**/*.xml
configuration:
map-underscore-to-camel-case: true
```
启动类
启动类增加@MapperScan(value = {"com.demo.store.dao"})注解
md
```java
@EnableScheduling
@EnableAsync
@MapperScan(value = {"com.demo.store.dao"})
@SpringBootApplication
public class App {
public static void main( String[] args) {
IdGeneratorOptions options = new IdGeneratorOptions();
options.WorkerId = 4;//机器编码
YitIdHelper.setIdGenerator(options);
JwtUtil.initRSA();
SpringApplication.run(App.class,args);
}
}
```
mybatis拦截器
md
```java
@Slf4j
@Component
@Intercepts({
@Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}),
@Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class,
RowBounds.class, ResultHandler.class})})
public class MybatisInterceptorColdChain implements Interceptor {
@SuppressWarnings("unused")
private Properties properties;
public Object intercept(Invocation invocation) throws Throwable {
MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
Object parameter = null;
if (invocation.getArgs().length > 1) {
parameter = invocation.getArgs()[1];
}
String sqlId = mappedStatement.getId();
String sqlName = mappedStatement.getSqlCommandType().name();
BoundSql boundSql = mappedStatement.getBoundSql(parameter);
Configuration configuration = mappedStatement.getConfiguration();
Object returnValue = null;
long start = System.currentTimeMillis();
returnValue = invocation.proceed();
long end = System.currentTimeMillis();
long time = (end - start);
String sql = getSql(configuration, boundSql, sqlId, time);
if (sqlName.equals(SqlCommandType.UPDATE.toString())) {
log.info("执行了UPDATE语句:" + sql);
}
if (sqlName.equals(SqlCommandType.INSERT.toString())) {
log.info("执行了INSERT语句:" + sql);
}
if (sqlName.equals(SqlCommandType.DELETE.toString())) {
log.info("执行了DELETE语句:" + sql);
}
if (time > 2000) {
log.warn("时间过长的sql:" + sql);
}
return returnValue;
}
public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId, long time) {
String sql = showSql(configuration, boundSql);
StringBuilder str = new StringBuilder(100);
str.append(sqlId);
str.append(":");
str.append(sql);
str.append(" 执行的时间为: ");
str.append(time);
str.append("ms");
return str.toString();
}
private static String getParameterValue(Object obj) {
String value = null;
if (obj instanceof String) {
value = "'" + obj.toString() + "'";
} else if (obj instanceof Date) {
DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
value = "'" + formatter.format(((Date) obj).getTime()) + "'";
} else {
if (obj != null) {
value = obj.toString();
} else {
value = "";
}
}
return value;
}
public static String showSql(Configuration configuration, BoundSql boundSql) {
Object parameterObject = boundSql.getParameterObject();
List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
if (parameterMappings.size() > 0 && parameterObject != null) {
TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(parameterObject)));
} else {
MetaObject metaObject = configuration.newMetaObject(parameterObject);
for (ParameterMapping parameterMapping : parameterMappings) {
String propertyName = parameterMapping.getProperty();
if (metaObject.hasGetter(propertyName)) {
Object obj = metaObject.getValue(propertyName);
sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
} else if (boundSql.hasAdditionalParameter(propertyName)) {
Object obj = boundSql.getAdditionalParameter(propertyName);
sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
}
}
}
}
return sql;
}
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
public void setProperties(Properties properties0) {
this.properties = properties0;
}
}
```
More
Check out the documentation for the full list of markdown extensions.