Java 之jdbc连接mysql数据库
package jdbc; import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties; public class JdbcUtils
{
private static String url;
private static String user;
private static String password;
static {
try {
//FileInputStream in = new FileInputStream(new File("./src/db.properties"));
InputStream in = JdbcUtils.class.getResourceAsStream("/db.properties");
Properties properties = new Properties();
properties.load(in);
Class.forName(properties.getProperty("driver"));
url = properties.getProperty("url");
user = properties.getProperty("user");
password = properties.getProperty("password");
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
/**
* 获取连接
* @return
*/
public static Connection getConnection() {
try {
return DriverManager.getConnection(url, user, password);
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
} /**
* 关闭连接
*/
public static void close(Statement stateMent, Connection connection) {
if (stateMent != null) {
try {
stateMent.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
} }
package jdbc.statement; import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement; import jdbc.JdbcUtils; import org.junit.Test; public class StateMentTest { @Test
public void testInsert() {
Connection conn = null;
Statement stmt = null;
try {
conn = JdbcUtils.getConnection();
stmt = conn.createStatement();
String sql = "insert into test (name) values ('test')";
int count = stmt.executeUpdate(sql);
System.out.println(count);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
JdbcUtils.close(stmt, conn);
}
}
@Test
public void testUpdate() {
Connection conn = null;
Statement stmt = null;
try {
conn = JdbcUtils.getConnection();
stmt = conn.createStatement();
String sql = "update test set name = 'update' where id=4";
int count = stmt.executeUpdate(sql);
System.out.println(count);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
JdbcUtils.close(stmt, conn);
}
}
@Test
public void testDelete() { Connection conn = null;
Statement stmt = null;
try {
conn = JdbcUtils.getConnection();
stmt = conn.createStatement();
String sql = "delete from test where id=4";
int count = stmt.executeUpdate(sql);
System.out.println(count);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
JdbcUtils.close(stmt, conn);
}
} @Test
public void testSelect() {
Connection conn = null;
Statement stmt = null;
try {
conn = JdbcUtils.getConnection();
stmt = conn.createStatement();
String sql = "select * from test";
ResultSet resultSet = stmt.executeQuery(sql);
while(resultSet.next()) {
System.out.println(resultSet.getString("name"));
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
JdbcUtils.close(stmt, conn);
}
}
}
package jdbc.prepared; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException; import jdbc.JdbcUtils; import org.junit.Test; public class PreparedStateMent { @Test
public void testInsert()
{
Connection conn = JdbcUtils.getConnection();
String sql = "insert into test (name) values (?)";
PreparedStatement pstmt = null;
try {
pstmt = conn.prepareStatement(sql, PreparedStatement.RETURN_GENERATED_KEYS);
pstmt.setString(1, "prepared");
int count = pstmt.executeUpdate();
ResultSet resultSet = pstmt.getGeneratedKeys();
if (resultSet.next()) {
System.out.println(resultSet.getString(1));
}
System.out.println(count);
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally{
JdbcUtils.close(pstmt, conn);
}
} @Test
public void testUpdate()
{
Connection conn = JdbcUtils.getConnection();
String sql = "update test set name = ? where id = ?";
PreparedStatement pstmt = null;
try {
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, "prepareds");
pstmt.setInt(2, 6);
int count = pstmt.executeUpdate();
System.out.println(count);
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally{
JdbcUtils.close(pstmt, conn);
}
}
@Test
public void testDelete()
{
Connection conn = JdbcUtils.getConnection();
String sql = "delete from test where id = ?";
PreparedStatement pstmt = null;
try {
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, 6);
int count = pstmt.executeUpdate();
System.out.println(count);
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally{
JdbcUtils.close(pstmt, conn);
}
}
@Test
public void testSelect()
{
Connection conn = JdbcUtils.getConnection();
String sql = "select * from test";
PreparedStatement pstmt = null;
try {
pstmt = conn.prepareStatement(sql);
ResultSet set = pstmt.executeQuery();
while(set.next()) {
System.out.println(set.getString("name"));
}
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally{
JdbcUtils.close(pstmt, conn);
}
}
}
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