package package2;
import com.sun.jdi.Value;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
public class DatabaseUtil {
public static String createTableSQL(Class<?> clazz) {
StringBuilder sb = new StringBuilder();
sb.append("CREATE TABLE ");
sb.append(clazz.getSimpleName());
sb.append(" (");
Field[] fields = clazz.getDeclaredFields();
for (Field field : fields) {
Column column = field.getAnnotation(Column.class);
if (column != null) {
sb.append(columnLabelToColumnName(column.label()));
sb.append(" ");
// 根据不同类型添加不同的SQL类型
sb.append(sqlTypeForField(field));
sb.append(",");
}
}
// 移除最后一个逗号
sb.deleteCharAt(sb.length() - 1);
sb.append(");");
return sb.toString();
}
private static String columnLabelToColumnName(String label) {
// 根据实际情况转换,例如将中文名转换为合法的数据库列名
if (label.equals("姓名")){
return"name";
}
if (label.equals("性别")){
return"sex";
}
if (label.equals("年龄")){
return"age";
}
if (label.equals("身份证号")){
return"idNo";
}
if (label.equals("是否已婚")){
return"isMerried";
}
return label;
}
private static String sqlTypeForField(Field field) {
// 根据字段类型生成相应的SQL类型
Type fieldType = field.getType();
if (fieldType.equals(String.class)) {
return "VARCHAR(255)";
} else if (fieldType.equals(Integer.class)) {
return "INT";
} else if (fieldType.equals(Boolean.class)) {
return "BOOLEAN";
} else {
// 默认或其他类型处理
return "VARCHAR(255)";
}
}
// 以下方法可以根据注解校验输入
public static boolean validateField(Field field, Value value) {
Column column = field.getAnnotation(Column.class);
int len1 = value.toString().length();
double len2 = value.toString().length();
if (column == null) return true;
// 添加校验逻辑
if(sqlTypeForField(field)=="VARCHAR(255)"){
if(column.maxLength()!= -1 || column.maxLength() >= len1){
if (column.minLength()!=-1 || column.minLength()<=len1){
return true;
}else return false;
}
}
if(sqlTypeForField(field)=="INT"){
if(column.maxValue()!= -1 || column.maxValue() >= len2){
if (column.minValue()!=-1 || column.minValue()<=len2){
return true;
}else return false;
}
}
return true;
}
}
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