JDBC 工具類封裝jdbcUtils
阿新 • • 發佈：2019-01-07
public class JdbcUtil {
private static Connection connection = null;
private static PreparedStatement ps = null;
private static ResultSet rs = null;
public static Connection getConnection() {
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "123456");
} catch (Exception e) {
e.printStackTrace();
}
return connection;
}
public static void executeUpdate(String sql,Object[] params) {
try {
ps = connection.prepareStatement(sql);
if(params !=null && params.length != 0) {
for(int i = 0;i<params.length;i++) {
ps.setObject(i+1, params[i]);
}
}
ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void releaseDB() {
try {
if(rs != null) {
rs.close();
}
if(ps != null) {
ps.close();
}
if(connection != null) {
connection.close();
}
} catch (Exception e2) {
// TODO: handle exception
e2.printStackTrace();
}
}
public static List<Map<String, Object>> executeQuery(String sql,Object[] params){
ResultSet rs = null;
List<Map<String, Object>> list = new ArrayList<>();
try {
ps = connection.prepareStatement(sql);
if(params !=null && params.length != 0) {
for(int i = 0;i<params.length;i++) {
ps.setObject(i+1, params[i]);
}
}
rs = ps.executeQuery();
ResultSetMetaData rsmd = (ResultSetMetaData) rs.getMetaData();
int columnCount = rsmd.getColumnCount();
while(rs.next()) {
Map<String, Object> map = new HashMap<>();
for(int i =0;i<columnCount;i++) {
String columnName = rsmd.getColumnLabel(i+1);
Object columnValue = rs.getObject(i+1);
//System.out.println(columnName + "===>" + columnValue);
map.put(columnName, columnValue);
}
list.add(map);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
}
private static Connection connection = null;
private static PreparedStatement ps = null;
private static ResultSet rs = null;
public static Connection getConnection() {
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "123456");
} catch (Exception e) {
e.printStackTrace();
}
return connection;
}
public static void executeUpdate(String sql,Object[] params) {
try {
ps = connection.prepareStatement(sql);
if(params !=null && params.length != 0) {
for(int i = 0;i<params.length;i++) {
ps.setObject(i+1, params[i]);
}
}
ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void releaseDB() {
try {
if(rs != null) {
rs.close();
}
if(ps != null) {
ps.close();
}
if(connection != null) {
connection.close();
}
} catch (Exception e2) {
// TODO: handle exception
e2.printStackTrace();
}
}
public static List<Map<String, Object>> executeQuery(String sql,Object[] params){
ResultSet rs = null;
List<Map<String, Object>> list = new ArrayList<>();
try {
ps = connection.prepareStatement(sql);
if(params !=null && params.length != 0) {
for(int i = 0;i<params.length;i++) {
ps.setObject(i+1, params[i]);
}
}
rs = ps.executeQuery();
ResultSetMetaData rsmd = (ResultSetMetaData) rs.getMetaData();
int columnCount = rsmd.getColumnCount();
while(rs.next()) {
Map<String, Object> map = new HashMap<>();
for(int i =0;i<columnCount;i++) {
String columnName = rsmd.getColumnLabel(i+1);
Object columnValue = rs.getObject(i+1);
//System.out.println(columnName + "===>" + columnValue);
map.put(columnName, columnValue);
}
list.add(map);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
}