JDBC操作数据库的几种方式。

1最基本的操作读取

import java.sql.*;

public class TestJDBC {

public static void main(String[] args) throws Exception{
ResultSet rs = null;
Statement stmt = null;
Connection conn = null;
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.0.1:1521:SXT", "scott", "tiger");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from dept");
while(rs.next()) {
System.out.println(rs.getString("deptno"));
System.out.println(rs.getInt("deptno"));
}
rs.close();
stmt.close();
conn.close();

}
}

2PreparedStatement读取

import java.sql.*;
public class TestPrepStmt {
public static void main(String[] args) throws Exception{
PreparedStatement pstmt = null;
Connection conn = null;
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.0.1:1521:SXT", "scott", "tiger");
pstmt = conn.prepareStatement("insert into dept2 values (?, ?, ?)");
pstmt.setInt(1, 33);
pstmt.setString(2, "name");
pstmt.setString(3, "loc");
pstmt.executeUpdate();
pstmt.close();
conn.close();
}

}

3调用存储过程

import java.sql.*;
public class TestProc {
public static void main(String[] args) throws Exception {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.0.1:1521:SXT", "scott", "tiger");
CallableStatement cstmt = conn.prepareCall("{call p(?, ?, ?, ?)}");
cstmt.registerOutParameter(3, Types.INTEGER);
cstmt.registerOutParameter(4, Types.INTEGER);
cstmt.setInt(1, 3);
cstmt.setInt(2, 4);
cstmt.setInt(4, 5);
cstmt.execute();
System.out.println(cstmt.getInt(3));
System.out.println(cstmt.getInt(4));
cstmt.close();
conn.close();
}
}

4执行批处理

import java.sql.*;
public class TestBatch {

public static void main(String[] args) throws Exception {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.0.1:1521:SXT", "scott", "tiger");
/*
Statement stmt = conn.createStatement();
stmt.addBatch("insert into dept2 values (51, '500', 'haha')");
stmt.addBatch("insert into dept2 values (52, '500', 'haha')");
stmt.addBatch("insert into dept2 values (53, '500', 'haha')");
stmt.executeBatch();
stmt.close();
*/

PreparedStatement ps = conn.prepareStatement("insert into dept2 values (?, ?, ?)");
ps.setInt(1, 61);
ps.setString(2, "haha");
ps.setString(3, "bj");
ps.addBatch();

ps.setInt(1, 62);
ps.setString(2, "haha");
ps.setString(3, "bj");
ps.addBatch();

ps.setInt(1, 63);
ps.setString(2, "haha");
ps.setString(3, "bj");
ps.addBatch();

ps.executeBatch();
ps.close();

conn.close();

}

}


5 执行事务：
import java.sql.*;
public class TestTransaction {
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:SXT", "scott", "tiger");
conn.setAutoCommit(false);
stmt = conn.createStatement();
stmt.addBatch("insert into dept2 values (51, '500', 'haha')");
stmt.addBatch("insert into dept2 values (52, '500', 'haha')");
stmt.addBatch("insert into dept2 values (53, '500', 'haha')");
stmt.executeBatch();
conn.commit();
conn.setAutoCommit(true);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch(SQLException e) {
e.printStackTrace();
try {
if(conn != null)
{
conn.rollback();
conn.setAutoCommit(true);
}
} catch (SQLException e1) {
e1.printStackTrace();
}
}finally {
try {
if(stmt != null)
stmt.close();
if(conn != null)
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}


6可以滚动的结果集：
import java.sql.*;

public class TestScroll {
public static void main(String args[]) {

try {
new oracle.jdbc.driver.OracleDriver();
String url = "jdbc:oracle:thin:@192.168.0.1:1521:SXT";
Connection conn = DriverManager
.getConnection(url, "scott", "tiger");
Statement stmt = conn.createStatement(
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
ResultSet rs = stmt
.executeQuery("select * from emp order by sal");
rs.next();
System.out.println(rs.getInt(1));
rs.last();
System.out.println(rs.getString(1));
System.out.println(rs.isLast());
System.out.println(rs.isAfterLast());
System.out.println(rs.getRow());
rs.previous();
System.out.println(rs.getString(1));
rs.absolute(6);
System.out.println(rs.getString(1));
rs.close();
stmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}


7可以更新的结果集：
import java.sql.*;
public class TestUpdataRs {
public static void main(String args[]){

try{
new oracle.jdbc.driver.OracleDriver();
String url="jdbc:oracle:thin:@192.168.0.1:1521:SXT";
Connection conn=DriverManager.getConnection(url,"scott","tiger");
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);

ResultSet rs=stmt.executeQuery("select * from emp2");

rs.next();
//更新一行数据
rs.updateString("ename","AAAA");
rs.updateRow();

//插入新行
rs.moveToInsertRow();
rs.updateInt(1, 9999);
rs.updateString("ename","AAAA");
rs.updateInt("mgr", 7839);
rs.updateDouble("sal", 99.99);
rs.insertRow();
//将光标移动到新建的行
rs.moveToCurrentRow();

//删除行
rs.absolute(5);
rs.deleteRow();

//取消更新
//rs.cancelRowUpdates();

}catch(SQLException e){
e.printStackTrace();
}
}
}