标签：nis 返回 cat 参数 iso context finally session mybatis
1.SqlSession下的四大对象
Executor、StatementHandler、ParameterHandler、ResultSetHandler
StatementHandler的作用是使用数据库的Statement(PreparedStatement)执行操作
ParameterHandler是用来处理SQL参数的
ResultSetHandler是进行数据集的封装返回处理的
2.mybatis中有3中执行器：
SIMPLE——简易执行器，默认
REUSE——是一种能够执行重用预处理语句的执行器
BATCH ——执行器重用语句和批量更新，批量专用的执行器
private SqlSession openSessionFromDataSource(ExecutorType execType, TransactionIsolationLevel level, boolean autoCommit) {
Transaction tx = null;
DefaultSqlSession var8;
try {
Environment environment = this.configuration.getEnvironment();
TransactionFactory transactionFactory = this.getTransactionFactoryFromEnvironment(environment);
tx = transactionFactory.newTransaction(environment.getDataSource(), level, autoCommit);
Executor executor = this.configuration.newExecutor(tx, execType, autoCommit);
var8 = new DefaultSqlSession(this.configuration, executor);
} catch (Exception var12) {
this.closeTransaction(tx);
throw ExceptionFactory.wrapException("Error opening session. Cause: " + var12, var12);
} finally {
ErrorContext.instance().reset();
}
return var8;
}
标签：nis 返回 cat 参数 iso context finally session mybatis
原文地址：https://www.cnblogs.com/lvjygogo/p/9531507.html
