java得到数据库信息
// 得到当前数据库下所有的表名
public void getTableNameByCon(Connection con) {
try {
DatabaseMetaData meta = con.getMetaData();
ResultSet rs = meta.getTables(null, null, null,
new String[] { "TABLE" });
while (rs.next()) {
System.out.println("表名：" + rs.getString(3));
System.out.println("表所属用户名：" + rs.getString(2));
System.out.println("------------------------------");
}
con.close();
} catch (Exception e) {
try {
con.close();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// 得到表的所有字段信息
public List<DBTableFieldStruct> getFieldList(String tableName, Connection con)
throws SQLException {
String sql = " SELECT * FROM " + tableName;
PreparedStatement ps = con.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
ResultSetMetaData meta = rs.getMetaData();
int columnCount = meta.getColumnCount();
List<DBTableFieldStruct> result = new ArrayList<DBTableFieldStruct>();
for (int i = 0; i < columnCount; i++) {
DBTableFieldStruct field = new DBTableFieldStruct(); //javabean 如下
int cursor = i + 1;
field.setName(meta.getColumnName(cursor));
field.setType(meta.getColumnType(cursor));
field.setSize(meta.getColumnDisplaySize(cursor));
field.setScale(meta.getScale(cursor));
field.setIsNullable(meta.isNullable(cursor));
result.add(field);
}
return result;
}
public class DBTableFieldStruct {
private String name;
private int type;
private int size;
private int isNullable;
private int scale;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
public int getIsNullable() {
return isNullable;
}
public void setIsNullable(int isNullable) {
this.isNullable = isNullable;
}
public int getScale() {
return scale;
}
public void setScale(int scale) {
this.scale = scale;
}
}