package org.nutz.dao.impl.jdbc.psql;
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.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.sql.Sql;
import org.nutz.dao.util.Pojos;
import org.nutz.lang.Lang;
public class PsqlJdbcExpert extends AbstractJdbcExpert {
public PsqlJdbcExpert(JdbcExpertConfigFile conf) {
super(conf);
}
public String getDatabaseType() {
return DB.PSQL.name();
}
public void formatQuery(Pojo pojo) {
Pager pager = pojo.getContext().getPager();
// 需要进行分页
if (null != pager && pager.getPageNumber() > 0)
pojo.append(Pojos.Items.wrapf( " LIMIT %d OFFSET %d",
pager.getPageSize(),
pager.getOffset()));
}
public void formatQuery(Sql sql) {
Pager pager = sql.getContext().getPager();
if (null != pager && pager.getPageNumber() > 0) {
sql.setSourceSql(sql.getSourceSql() + String.format(" LIMIT %d OFFSET %d",
pager.getPageSize(),
pager.getOffset()));
}
}
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());
// 自增主键特殊形式关键字
if (mf.isId() && mf.isAutoIncreasement()) {
sb.append(" SERIAL");
} else {
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())
throw Lang.noImplement();
if (mf.hasDefaultValue())
sb.append(" DEFAULT '").append(getDefaultValue(mf)).append('\'');
}
}
sb.append(',');
}
// 创建主键
List<MappingField> pks = en.getPks();
if (!pks.isEmpty()) {
sb.append('\n');
sb.append(String.format("CONSTRAINT %s_pkey PRIMARY KEY (", en.getTableName()));
for (MappingField pk : pks) {
sb.append(pk.getColumnName()).append(',');
}
sb.setCharAt(sb.length() - 1, ')');
sb.append("\n ");
}
// 结束表字段设置
sb.setCharAt(sb.length() - 1, ')');
// 执行创建语句
dao.execute(Sqls.create(sb.toString()));
// 创建索引
dao.execute(createIndexs(en).toArray(new Sql[0]));
// 创建关联表
createRelation(dao, en);
// 添加注释(表注释与字段注释)
addComment(dao, en);
return true;
}
@Override
protected String evalFieldType(MappingField mf) {
if (mf.getCustomDbType() != null)
return mf.getCustomDbType();
switch (mf.getColumnType()) {
case INT:
// 用户自定义了宽度
if (mf.getWidth() > 0)
return "NUMERIC(" + mf.getWidth() + ")";
// 用数据库的默认宽度
return "INT";
case FLOAT:
// 用户自定义了精度
if (mf.getWidth() > 0 && mf.getPrecision() > 0) {
return "NUMERIC(" + mf.getWidth() + "," + mf.getPrecision() + ")";
}
// 用默认精度
if (mf.getTypeMirror().isDouble())
return "NUMERIC(15,10)";
return "NUMERIC";
case BINARY:
return "BYTEA";
case DATETIME:
return "TIMESTAMP";
default :
break;
}
return super.evalFieldType(mf);
}
protected String createResultSetMetaSql(Entity<?> en) {
return "SELECT * FROM " + en.getViewName() + " LIMIT 1";
}
}