mybatis获取执行的sql语句

• Z时代
• 2024-01-10
• 分类：综合

package com.jcl.orm.tkmapper.intercept;
import com.alibaba.dubbo.common.utils.CollectionUtils;
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.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.type.TypeHandlerRegistry;
import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.regex.Matcher;
@Intercepts({
@Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class})
})
public class TableEventInterceptor implements Interceptor {
@Override
public Object intercept(Invocation invocation) throws Throwable {
/* MappedStatement mappedStatement = (MappedStatement)invocation.getArgs()[0];
        StatementHandler statementHandler = (StatementHandler) invocation.getTarget();
        SqlCommandType sqlCommandType = mappedStatement.getSqlCommandType();
        Object parameter = invocation.getArgs()[1];*/
final Object[] args = invocation.getArgs();
        MappedStatement ms = (MappedStatement) args[0];
        Object parameter = null;
        if (invocation.getArgs().length > 1) {
            parameter = invocation.getArgs()[1];
        }
        String sqlId = ms.getId();
        BoundSql boundSql = ms.getBoundSql(parameter);
        Configuration configuration = ms.getConfiguration();
        String sql = getSql(configuration, boundSql);
        return invocation.proceed();
    }
// 封装了一下sql语句，使得结果返回完整xml路径下的sql语句节点id + sql语句
public static String getSql(Configuration configuration, BoundSql boundSql) {
        String sql = showSql(configuration, boundSql);
        return sql;
    }
// 如果参数是String，则添加单引号， 如果是日期，则转换为时间格式器并加单引号； 对参数是null和不是null的情况作了处理
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;
    }
// 进行？的替换
public static String showSql(Configuration configuration, BoundSql boundSql) {
// 获取参数
Object parameterObject = boundSql.getParameterObject();
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
// sql语句中多个空格都用一个空格代替
String sql = boundSql.getSql().replaceAll("[\s]+", " ");
        if (CollectionUtils.isNotEmpty(parameterMappings) && parameterObject != null) {
// 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换
TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
// 如果根据parameterObject.getClass(）可以找到对应的类型，则替换
if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = sql.replaceFirst("\?", Matcher.quoteReplacement(getParameterValue(parameterObject)));
            } else {
// MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
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)) {
// 该分支是动态sql
Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\?", Matcher.quoteReplacement(getParameterValue(obj)));
                    } else {
// 打印出缺失，提醒该参数缺失并防止错位
sql = sql.replaceFirst("\?", "缺失");
                    }
                }
            }
        }
        return sql;
    }
@Override
public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }
@Override
public void setProperties(Properties properties) {
    }
}

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