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SQLite基本（实例FileOrganizer2013.5.12）

2024-07-04 22:56:23   225人阅读

工具用 SQLite Dev
 
数据类型:
1.NULL：空值。
2.INTEGER：带符号的整型，具体取决有存入数字的范围大小。
3.REAL：浮点数字，存储为8-byte IEEE浮点数。
4.TEXT：字符串文本。
5.BLOB：二进制对象。
 
=======================
添加 sqlite-jdbc-3.7.2.jar
 
连接
import org.sqlite.JDBC;

    Connection conn = null;
    Statement stat;
    ResultSet rs;


// 连接数据库
    void connect() {
        try {
            // 连接SQLite的JDBC
            Class.forName("org.sqlite.JDBC");
            // 建立一个数据库名zieckey.db的连接，如果不存在就在当前目录下创建之
            conn = DriverManager.getConnection("jdbc:sqlite:test.db");
            stat = conn.createStatement();
        } catch (Exception e) {
            e.printStackTrace();
        }
        //JOptionPane.showMessageDialog(null,"已连接数据库");
        if( null == conn){
            JOptionPane.showMessageDialog(null,"连接数据库失败");
            System.exit(1);
        }
            
    }

    // 断开连接
    void disconnect() {
        try {
            // rs.close();
            conn.close();// 结束数据库的连接
        } catch (SQLException e) {
            e.printStackTrace();
        }
        //JOptionPane.showMessageDialog(null,    "已断开数据库");
    }

读取元数据和数据

    private void showMetaData() {//显示数据表头以测试数据库连接
        ResultSetMetaData rsmd; //取得元数据
        try {
            rs = stat.executeQuery("Select * From test");
            rsmd = rs.getMetaData();
            int ColumnCount = rsmd.getColumnCount();
            for (int j = 1; j <= ColumnCount; j++) {
                System.out.println(rsmd.getColumnName(j));
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }

    private void showDataInTable() {//显示数据
        //定义表格的数据模型
        DefaultTableModel dtm = (DefaultTableModel) jTable1.getModel();
        try {
            while (rs.next()) {
                Vector newRow = new Vector();
                int c = 1, numberOfColumns;
                numberOfColumns = rs.getMetaData().getColumnCount();
                while (c <= numberOfColumns) {
                    newRow.addElement(rs.getString(c));
                    c++;
                }
                dtm.addRow(newRow);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

查询指定行

select * from MAIN.[test] where rowid =10;

删除

String updateSql="delete from test where RecID =‘"+(String)jTable1.getValueAt(jTable1.getSelectedRow(),0)+"‘";
        try {
            stat.executeUpdate(updateSql);
            showDataInTable();
            System.out.println("已delete");
        } catch (SQLException ex) {
            ex.printStackTrace();
        }

更新

int row = jTable1.getSelectedRow();
         String updateSql="update test "// + "set Dept=‘sorry2"
                 + "set Dept=‘"+jTextField2.getText()
                 + "‘, SendID=‘"+jTextField3.getText()
                 + "‘, Title=‘"+jTextField4.getText()
                 + "‘, RecDate=‘"+jTextField5.getText()
                 + "‘, Link=‘"+jTextField6.getText()
                 + "‘ where RecID =‘"+(String)jTable1.getValueAt(row,0)+"‘"; 
        try {
            stat.executeUpdate(updateSql);
            showDataInTable();
            System.out.println("已save");
        } catch (SQLException ex) {
            ex.printStackTrace();
        }

插入

String updateSql="insert into test VALUES("
                 + "‘"+jTextField1.getText()
                 + "‘,‘"+jTextField2.getText()
                 + "‘,‘"+jTextField3.getText()
                 + "‘,‘"+jTextField4.getText()
                 + "‘,‘"+jTextField5.getText()
                 + "‘,‘"+jTextField6.getText()
                 +"‘)"; 
        try {
            stat.executeUpdate(updateSql);
            showDataInTable();
}

 


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