package org.nutz.dao.impl.jdbc.mysql;
import java.util.List;
import org.nutz.dao.DB;
import org.nutz.dao.Dao;
import org.nutz.dao.Sqls;
import org.nutz.dao.entity.Entity;
import org.nutz.dao.entity.MappingField;
import org.nutz.dao.entity.PkType;
import org.nutz.dao.entity.annotation.ColType;
import org.nutz.dao.impl.jdbc.AbstractJdbcExpert;
import org.nutz.dao.jdbc.JdbcExpertConfigFile;
import org.nutz.dao.pager.Pager;
import org.nutz.dao.sql.Pojo;
import org.nutz.dao.util.Pojos;
public class MysqlJdbcExpert extends AbstractJdbcExpert {
private static final String META_ENGINE = "mysql-engine";
private static final String META_CHARSET = "mysql-charset";
public MysqlJdbcExpert(JdbcExpertConfigFile conf) {
super(conf);
}
public String getDatabaseType() {
return DB.MYSQL.name();
}
public void formatQuery(Pojo pojo) {
Pager pager = pojo.getContext().getPager();
// 需要进行分页
if (pager != null)
pojo.append(Pojos.Items.wrapf(" LIMIT %d, %d", pager.getOffset(), pager.getPageSize()));
}
@Override
protected String evalFieldType(MappingField mf) {
// Mysql 的精度是按照 bit
if (mf.getColumnType() == ColType.INT) {
int width = mf.getWidth();
if (width <= 0)
return "INT(32)";
else if (width <= 4) {
return "TINYINT(" + (width * 4) + ")";
} else if (width <= 8) {
return "INT(" + (width * 4) + ")";
}
return "BIGINT(" + (width * 4) + ")";
}
// 其它的参照默认字段规则 ...
return super.evalFieldType(mf);
}
public boolean createEntity(Dao dao, Entity<?> en) {
StringBuilder sb = new StringBuilder("CREATE TABLE " + en.getTableName() + "(");
// 创建字段
for (MappingField mf : en.getMappingFields()) {
sb.append('\n').append(mf.getColumnName());
sb.append(' ').append(evalFieldType(mf));
// 非主键的 @Name，应该加入唯一性约束
if (mf.isName() && en.getPkType() != PkType.NAME) {
sb.append(" UNIQUE NOT NULL");
}
// 普通字段
else {
if (mf.isUnsigned())
sb.append(" UNSIGNED");
if (mf.isNotNull())
sb.append(" NOT NULL");
if (mf.isAutoIncreasement())
sb.append(" AUTO_INCREMENT");
if (mf.hasDefaultValue())
sb.append(" DEFAULT '").append(mf.getDefaultValue(null)).append('\'');
}
sb.append(',');
}
// 创建主键
List<MappingField> pks = en.getPks();
if (!pks.isEmpty()) {
sb.append('\n');
sb.append("PRIMARY KEY (");
for (MappingField pk : pks) {
sb.append(pk.getColumnName()).append(',');
}
sb.setCharAt(sb.length() - 1, ')');
sb.append("\n ");
}
// 创建索引
// TODO ...
// 结束表字段设置
sb.setCharAt(sb.length() - 1, ')');
// 设置特殊引擎
if (en.hasMeta(META_ENGINE)) {
sb.append(" ENGINE=" + en.getMeta(META_ENGINE));
}
// 默认采用 UTF-8 编码
if (en.hasMeta(META_CHARSET)) {
sb.append(" CHARSET=" + en.getMeta(META_CHARSET));
} else {
sb.append(" CHARSET=utf8");
}
// 执行创建语句
dao.execute(Sqls.create(sb.toString()));
// 创建关联表
createRelation(dao, en);
return true;
}
protected String createResultSetMetaSql(Entity<?> en) {
return "SELECT * FROM " + en.getViewName() + " LIMIT 1";
}
}