自定义mybatis拦截器
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.parser.CCJSqlParserUtil;
import net.sf.jsqlparser.schema.Column;
import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.Statement;
import net.sf.jsqlparser.statement.update.Update;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.mapping.SqlSource;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.DefaultReflectorFactory;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.factory.DefaultObjectFactory;
import org.apache.ibatis.reflection.wrapper.DefaultObjectWrapperFactory;
import java.sql.SQLException;
import java.util.List;
import java.util.Properties;
/**
* 自定义 Mybatis 插件,自动设置 createTime 和 updatTime 的值。
* 拦截 update 操作(添加和修改)
*
*/
@Intercepts({ @Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }) })
public class CustomInterceptor implements Interceptor {
private static final String UPDATED_TIME_CAMELCASE = "updated_time";
@Override
public Object intercept(Invocation invocation) throws Throwable {
String updatedColumnName = UPDATED_TIME_CAMELCASE;
try {
// 获取sql
String sql = getSqlByInvocation(invocation);
String sql2Reset = sql;
//忽略sql中包含on conflict的情况
if (!StringUtils.isBlank(sql2Reset) && !sql2Reset.toUpperCase().contains("ON CONFLICT")) {
try {
Statement statement = CCJSqlParserUtil.parse(sql);
if (statement instanceof Update) {
Update updateStatement = (Update) statement;
Table table = updateStatement.getTable();
if (table != null) {
List<Column> columns = updateStatement.getColumns();
List<Expression> expressions = updateStatement.getExpressions();
if (!isUpdatedTimeExists(columns, updatedColumnName)) {
columns.add(new Column(updatedColumnName));
expressions.add(CCJSqlParserUtil.parseExpression("now()"));
updateStatement.setColumns(columns);
updateStatement.setExpressions(expressions);
sql2Reset = updateStatement.toString();
}
}
}
} catch (Exception e) {
LogUtils.info("sql_parse error "+sql, e);
}
}
// 包装sql后,重置到invocation中
resetSql2Invocation(invocation, sql2Reset);
// 返回,继续执行
return invocation.proceed();
} catch (Throwable e){
LogUtils.error("sql_update_interceptor error", e);
throw e;
}
}
private boolean isUpdatedTimeExists(List<Column> columns, String updatedColumnName) {
if (columns == null || columns.size() <= 0 ) {
return false;
}
for (Column column : columns) {
if(String.valueOf(column.getColumnName()).equalsIgnoreCase(updatedColumnName)) {
return true;
}
}
return false;
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties) {
}
/**
* 获取sql语句
* @param invocation
* @return
*/
private String getSqlByInvocation(Invocation invocation) {
final Object[] args = invocation.getArgs();
MappedStatement ms = (MappedStatement) args[0];
Object parameterObject = args[1];
BoundSql boundSql = ms.getBoundSql(parameterObject);
return boundSql.getSql();
}
/**
* 包装sql后,重置到invocation中
* @param invocation
* @param sql
* @throws SQLException
*/
private void resetSql2Invocation(Invocation invocation, String sql) throws SQLException {
final Object[] args = invocation.getArgs();
MappedStatement statement = (MappedStatement) args[0];
Object parameterObject = args[1];
BoundSql boundSql = statement.getBoundSql(parameterObject);
MappedStatement newStatement = newMappedStatement(statement, new BoundSqlSqlSource(boundSql));
MetaObject msObject = MetaObject.forObject(newStatement, new DefaultObjectFactory(), new DefaultObjectWrapperFactory(),new DefaultReflectorFactory());
msObject.setValue("sqlSource.boundSql.sql", sql);
args[0] = newStatement;
}
private MappedStatement newMappedStatement(MappedStatement ms, SqlSource newSqlSource) {
MappedStatement.Builder builder =
new MappedStatement.Builder(ms.getConfiguration(), ms.getId(), newSqlSource, ms.getSqlCommandType());
builder.resource(ms.getResource());
builder.fetchSize(ms.getFetchSize());
builder.statementType(ms.getStatementType());
builder.keyGenerator(ms.getKeyGenerator());
if (ms.getKeyProperties() != null && ms.getKeyProperties().length != 0) {
StringBuilder keyProperties = new StringBuilder();
for (String keyProperty : ms.getKeyProperties()) {
keyProperties.append(keyProperty).append(",");
}
keyProperties.delete(keyProperties.length() - 1, keyProperties.length());
builder.keyProperty(keyProperties.toString());
}
builder.timeout(ms.getTimeout());
builder.parameterMap(ms.getParameterMap());
builder.resultMaps(ms.getResultMaps());
builder.resultSetType(ms.getResultSetType());
builder.cache(ms.getCache());
builder.flushCacheRequired(ms.isFlushCacheRequired());
builder.useCache(ms.isUseCache());
return builder.build();
}
private String getOperateType(Invocation invocation) {
final Object[] args = invocation.getArgs();
MappedStatement ms = (MappedStatement) args[0];
SqlCommandType commondType = ms.getSqlCommandType();
if (commondType.compareTo(SqlCommandType.SELECT) == 0) {
return "select";
}
if (commondType.compareTo(SqlCommandType.INSERT) == 0) {
return "insert";
}
if (commondType.compareTo(SqlCommandType.UPDATE) == 0) {
return "update";
}
if (commondType.compareTo(SqlCommandType.DELETE) == 0) {
return "delete";
}
return null;
}
// 定义一个内部辅助类,作用是包装sql
class BoundSqlSqlSource implements SqlSource {
private BoundSql boundSql;
public BoundSqlSqlSource(BoundSql boundSql) {
this.boundSql = boundSql;
}
@Override
public BoundSql getBoundSql(Object parameterObject) {
return boundSql;
}
}
}
mybatis配置文件
<plugins>
<plugin interceptor="com.zhaopin.zhiq.mybatis.CustomInterceptor"/>
</plugins>