In the postJava JDBC Steps to Connect to DBwe have already seen a complete example using the interfaces Driver, Connection,StatementandResultSetprovided by the JDBC API. In this post we’ll see Java Connection interface in detail. Connection interface in JDBC Connectioninterfaceresides injava.sqlp...
packagecn.itcast.jdbc;importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.Statement;//jdbc的快速入门publicclassJdbcDemo1{publicstaticvoidmain(String[] args)throwsException {//1.导入驱动jar包//2.注册驱动Class.forName("com.mysql.jdbc.Driver");//3.获取数据的链接对象Connectionconnectio...
such as when a DataDirect for JDBC Driver is running on a Java-enabled web server. In this type of environment, performance can be improved significantly when connection pooling is used.Connection poolingallows you to reuse connections rather than create...
packagecom.jdbc.test;importjava.sql.Connection;importjava.sql.DriverManager;publicclassJdbcTest1 {publicstaticvoidmain(String[] args)throwsException {//注册驱动Class.forName("com.mysql.jdbc.Driver");//获取数据库的连接对象Connection root = DriverManager.getConnection("jdbc:mysql://localhost:3306/db3",...
使用JDBC 2.1 核心 API 创建的新Connection对象有一个与之关联的最初为空的类型映射。用户可以为此类型映射中的 UDT 输入一个自定义映射关系。在使用ResultSet.getObject方法从数据源中获取 UDT 时,getObject方法将检查该连接的类型映射是否有对应该 UDT 的条目。如果有,那么getObject方法将该 UDT 映射到所指示的类。
23/06/29 09:22:29 ERROR ApplicationMaster: User class threw exception: java.sql.SQLException: Connection is read-only. Queries leading to data modification are not allowed. java.sql.SQLException: Connection is read-only. Queries leading to data modification are not allowed. at com.mysql.jdbc.SQ...
<bean id="paymentTransactionManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager"abstract="false"lazy-init="default"autowire="default"><property name="dataSource"><ref bean="paymentDataSource"/></property></bean><tx:annotation-driven transaction-manager="paymentTransactionMana...
A new Connection object created using the JDBC 2.1 core API has an initially empty type map associated with it. A user may enter a custom mapping for a UDT in this type map. When a UDT is retrieved from a data source with the method ResultSet.getObject, the getObject method will check...
This is very expensive in some JDBC drivers, // so we don't want to do it unnecessarily (for example if we've explicitly // configured the connection pool to set it already). //这里设置自动提交由spring控制 if (con.getAutoCommit()) { txObject.setMustRestoreAutoCommit(true); if (logger...
protected java.sql.Connection getConnection(Properties props) throws SQLException { String jdbcUrlToUse = this.explicitUrl ? this.url : getUrl(); // URL should take precedence over properties //初始化一些连接信息 主机 端口 用户名密码 等