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SimpleAppendUpdateTimeVisitor.java
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SimpleAppendUpdateTimeVisitor.java
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package com.github.larva.zhang.problems;
import java.util.List;
import java.util.Optional;
import org.apache.commons.collections4.CollectionUtils;
import com.alibaba.druid.sql.SQLUtils;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlInsertStatement;
import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitorAdapter;
import com.alibaba.druid.util.StringUtils;
import lombok.extern.slf4j.Slf4j;
/**
* SimpleAppendUpdateTimeVisitor 简单的druid visitor实现,仅仅在insert on duplicate key update缺少设置更新时间字段时自动加上设置更新时间为当前时间
*
* @author zhanghan
* @date 2019/12/12
* @since 1.0
*/
@Slf4j
public class SimpleAppendUpdateTimeVisitor extends MySqlASTVisitorAdapter {
private static final ThreadLocal<Boolean> REWRITE_STATUS_CACHE = new ThreadLocal<>();
private static final String UPDATE_TIME_COLUMN = "update_time";
@Override
public boolean visit(MySqlInsertStatement x) {
boolean hasUpdateTimeCol = false;
// duplicate key update得到的都是SQLBinaryOpExpr
List<SQLExpr> duplicateKeyUpdate = x.getDuplicateKeyUpdate();
if (CollectionUtils.isNotEmpty(duplicateKeyUpdate)) {
for (SQLExpr sqlExpr : duplicateKeyUpdate) {
if (sqlExpr instanceof SQLBinaryOpExpr
&& ((SQLBinaryOpExpr) sqlExpr).conditionContainsColumn(UPDATE_TIME_COLUMN)) {
hasUpdateTimeCol = true;
break;
}
}
if (!hasUpdateTimeCol) {
// append update time column
String tableAlias = x.getTableSource().getAlias();
StringBuilder setUpdateTimeBuilder = new StringBuilder();
if (!StringUtils.isEmpty(tableAlias)) {
setUpdateTimeBuilder.append(tableAlias).append('.');
}
setUpdateTimeBuilder.append(UPDATE_TIME_COLUMN).append(" = now()");
SQLExpr sqlExpr = SQLUtils.toMySqlExpr(setUpdateTimeBuilder.toString());
duplicateKeyUpdate.add(sqlExpr);
// 重写状态记录
REWRITE_STATUS_CACHE.set(Boolean.TRUE);
}
}
return super.visit(x);
}
/**
* 返回重写状态并重置重写状态
*
* @return 重写状态,{@code true}表示已重写,{@code false}表示未重写
*/
public boolean getAndResetRewriteStatus() {
boolean rewriteStatus = Optional.ofNullable(REWRITE_STATUS_CACHE.get()).orElse(Boolean.FALSE);
// reset rewrite status
REWRITE_STATUS_CACHE.remove();
return rewriteStatus;
}
}