wiki.xsx.jg.core.OracleService Maven / Gradle / Ivy

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a generator, from the database tables convert to the Java classes or from the Java classes convert to the database tables. support mysql, oracle and sqlserver.
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package wiki.xsx.jg.core;

import java.math.BigDecimal;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Date;
import java.util.Set;

/**
 * Oracle实现类
 */
public class OracleService implements DatabaseService{
    private Database database;

    public OracleService(Database database) {
        this.database = database;
    }

    @Override
    public void setTableInfo() throws Exception {
        CommonService.setTableInfo(this);
    }

    @Override
    public void createTables(Set tableSet) throws Exception {
        CommonService.createTables(tableSet,  this);
    }

    @Override
    public Database getDatabase() {
        return this.database;
    }

    @Override
    public String getDropTableSQL(String className) {
        StringBuilder sql = new StringBuilder();
        sql.append("DECLARE ")
            .append("   num number; ")
            .append("BEGIN ")
            .append("    SELECT COUNT(1) INTO num FROM user_tables WHERE table_name = ('").append(className.toUpperCase()).append("'); ")
            .append("    IF num > 0 THEN ")
            .append("        EXECUTE IMMEDIATE 'DROP TABLE ").append(className.toUpperCase()).append("'; ")
            .append("    END IF; ")
            .append("END;");
        return sql.toString();
    }

    @Override
    public String getCreateTableSQL(Table table) {
        StringBuilder pk = new StringBuilder();
        StringBuilder sql = new StringBuilder();
        sql.append("CREATE TABLE ").append(table.getName().toUpperCase()).append("(");
        for (Column column : table.getColumnSet()){
            sql.append(column.getName()).append(" ");
            if (column.getType()!=null){
                sql.append(column.getType());
            }else{
                sql.append(getDataType(column.getJavaType()));
            }
            if (column.getDefaultValue()!=null){
                sql.append(" DEFAULT ").append(column.getDefaultValue());
            }
            if (column.getIsNotNull()){
                sql.append(" NOT NULL");
            }
            sql.append(",");
            if (column.getIsPrimaryKey()){
                pk.append(column.getName()).append(",");
            }

        }
        if (pk.length()>0){
            sql.append("PRIMARY KEY (").append(pk.substring(0, pk.length()-1)).append(")");
        }else{
            sql = sql.deleteCharAt(sql.length()-1);
        }
        sql.append(")");
        return sql.toString();
    }

    @Override
    public Class getTypeClass(String dataTypeName, int length, int scale) {
        if (dataTypeName.matches("CHAR|VARCHAR|VARCHAR2|LONG")){
            return String.class;
        }else if(dataTypeName.matches("NUMBER")) {
            if (scale==0){
                if (length==1){
                    return Short.class;
                }else if (2<=length&&length<=9){
                    return Integer.class;
                }else if (10<=length&&length<=18){
                    return Long.class;
                }else {
                    return BigDecimal.class;
                }
            }else if (scale==1){
                return Float.class;
            }else{
                return Double.class;
            }
        }else if(dataTypeName.matches("DATE|TIME|TIMESTAMP")) {
            return Date.class;
        }else if(dataTypeName.matches("BLOB")) {
            return Blob.class;
        }else if(dataTypeName.matches("CLOB")) {
            return Clob.class;
        }else{
            return Object.class;
        }
    }

    @Override
    public String getDataType(Class type) {
        if (type.getSimpleName().equalsIgnoreCase("String")){
            return "VARCHAR(255)";
        }else if(
            type.getSimpleName().equalsIgnoreCase("Integer")||
            type.getSimpleName().equalsIgnoreCase("Long")||
            type.getSimpleName().equalsIgnoreCase("Float")||
            type.getSimpleName().equalsIgnoreCase("Double")||
            type.getSimpleName().equalsIgnoreCase("BigDecimal")||
            type.getSimpleName().equalsIgnoreCase("Boolean")||
            type.getSimpleName().equalsIgnoreCase("Byte")||
            type.getSimpleName().equalsIgnoreCase("Short")
        ){
            return "NUMBER";
        }else if(
            type.getSimpleName().equalsIgnoreCase("Date")||
            type.getSimpleName().equalsIgnoreCase("Time")
        ){
            return "Date";
        }else if(type.getSimpleName().equalsIgnoreCase("Timestamp")){
            return "TIMESTAMP";
        }else if(type.getSimpleName().equalsIgnoreCase("Blob")){
            return "BLOB";
        }else if(type.getSimpleName().equalsIgnoreCase("Clob")){
            return "CLOB";
        }else if(type.getSimpleName().equalsIgnoreCase("byte[]")){
            return "RAW";
        }else{
            return "VARCHAR(255)";
        }
    }
}




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