数据库oracle，pgsq，mysql.相关设置

一.将工程中pgsql转换成mysql

1，修改数据库方言名：

<property name="hibernateProperties">
<!-- 各数据库对应的方言（Dialect） -->
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>

2，修改数据库连接配置信息

#pgsql 
connection.driverclass=com.mysql.jdbc.Driver
#aliyun
connection.url=jdbc\:mysql\://localhost:3306/hotel

3.获取mysql驱动包。

compile group: 'mysql', name: 'mysql-connector-java', version: '5.1.17'

二.访问pgsql数据库：

JdbcPool pool = new JdbcPool();
Connection conn=null;
try {
conn=pool.getConnection();
conn.setAutoCommit(true);
CallableStatement proc=conn.prepareCall("{call databack(?)}");
proc.registerOutParameter(1, Types.INTEGER);
proc.execute();

int key= proc.getInt(1);
//System.out.print("dadad:"+key);
proc.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

连接过程：

public static final String DBDRIVER = "oracle.jdbc.derver.oracleDricer"  ///数据库驱动

public static final String DBURL =“jdbc:oracle:thin:@localhost:1521:mldn”

public static final String DBUSER ="scott'

public static final String PASSWORD ="tiger'
 

Class.forName(DBDRIVER);

Connection con=DriverManager.getConnection(DBURL，DBUSER,PASSWORD);

String aql ="select mid ,name form menber"

PreparedStatement  pstmt=conn.prepareStatement(sql);

ResultSet rs =pstmt.executeQuery();

while (){

 int mid =rs.getInt(1);

}

conn.close

三.ServerSQL数据库连接：

String url="jdbc:sqlserver://ip地址:端口号;DatabaseName=TramCar";    
   try {   
    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
    Connection conn=DriverManager.getConnection(url,"huatu","dc_1234");
   /* String sql1 = " ";
   PreparedStatement pstmt=conn.prepareStatement(sql1);
   ResultSet rs=pstmt.executeQuery();