版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_31922571/article/details/77715709
能不能直接把？参数拼接完了以后SQL给我？
在开发的过程中，数据不对的时候，我们会去日志中找到 具体的sql 执行语句
但是往往是这样的
2017-08-30-14-35-23 [DEBUG] [main] [selectRecommendGoodsForStoreApp_132] - ==> Preparing: SELECT sk.SKU_ID AS skuId, sk.SKU_IMG_PATH AS skuImgPath, sk.SKU_NAME AS skuName, sk.SKU_NORMS AS skuNorms, sk.QUALITY_PERIOD AS qualityPeriod, sk.SKU_PACKAGE_NUM_1 as skuPackageNum1, sk.SKU_PACKAGE_NUM_2 as skuPackageNum2, sk.SKU_PACKAGE_NUM_3 as skuPackageNum3, sk.SKU_PACKAGE_UNIT_1 as skuPackageUnit1, sk.SKU_PACKAGE_UNIT_2 as skuPackageUnit2, sk.SKU_PACKAGE_UNIT_3 as skuPackageUnit3, sh.SELL_PRICE AS sellPrice, sh.USER_ID as supplierId, sh.SHELF_ID as shelfId, sh.WAREHOUSE_ID as warehouseId, sh.PROMOTION_PRICE as promotionPrice FROM ess_sku_recommend AS re LEFT JOIN ess_sku_custom as sk ON sk.SKU_ID=re.SKU_ID LEFT JOIN ess_shelf_info as sh ON sh.SKU_ID = sk.SKU_ID WHERE 1=1 and sh.WAREHOUSE_ID in ( ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? , ? ) group by sk.sku_id 2017-08-30-14-35-23 [DEBUG] [main] [selectRecommendGoodsForStoreApp_132] - ==> Parameters: 147(String), a07bfd2e052b4513b308e969e4cc6eea(String), W10000001(String), W10000002(String), W10000003(String), W10000006(String), W10000007(String), W11708261601220001(String), W11708281000390002(String), W11708281001220003(String), W11708281001540004(String), W11708281506390001(String), Wsdfsdf(String)
看到那一堆？？？？？？ 了吗？
上面的 代码 是 带有？ 的 预执行 sql 语句，现在好了，你看看第二个代码块里的 具体参数吧，你 不觉得 一个一个 的 去 替换然后 查询，然后看结果。。。。。 这个过程很反人类吗？
你只需要这段代码
下面这个是一个 mybatis plugin，放到你的 项目当中，然后在 mybatis 的配置文件中 加上 这个 plugin。
至于如何加plugin ,这个根据 mybatis 版本不同，以及 具体的配置规则不一样
请大家自行适配吧。
这个功能加上去之后
1.可以打印出最后执行的SQL（？已经给你替换成具体的参数了）
2.记录这个SQL执行的时间。这一点对于性能调优 还是很有帮助了
import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@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 SqlTimeInterceptor implements Interceptor {
@SuppressWarnings("unused")
private Properties properties;
private static Logger log = LoggerFactory.getLogger(SqlTimeInterceptor.class);
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();
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);
if (time > 1) {
String sql = getSql(configuration, boundSql, sqlId, time);
log.info(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(": 执行耗时");
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(new Date()) + "'";
} 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("\\?", 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("\\?", getParameterValue(obj));
} else if (boundSql.hasAdditionalParameter(propertyName)) {
Object obj = boundSql.getAdditionalParameter(propertyName);
sql = sql.replaceFirst("\\?", getParameterValue(obj));
}
}
}
}
return sql;
}
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
public void setProperties(Properties properties0) {
this.properties = properties0;
}
}